AU2011250844A1 - Herbicide-resistant sunflower plants, plynucleotides encoding herbicide-resistant acetohydroxy acid synthase large subunit proteins, and methods of use - Google Patents
Herbicide-resistant sunflower plants, plynucleotides encoding herbicide-resistant acetohydroxy acid synthase large subunit proteins, and methods of use Download PDFInfo
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- AU2011250844A1 AU2011250844A1 AU2011250844A AU2011250844A AU2011250844A1 AU 2011250844 A1 AU2011250844 A1 AU 2011250844A1 AU 2011250844 A AU2011250844 A AU 2011250844A AU 2011250844 A AU2011250844 A AU 2011250844A AU 2011250844 A1 AU2011250844 A1 AU 2011250844A1
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Landscapes
- Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
Abstract
Herbicide-resistant sunflower plants, isolated polynucleotides that encode herbicide resistant and wild-type acetohydroxyacid synthase large subunit (AHASL) polypeptides, and the amino acid sequences of these polypeptides, are described. Expression cassettes and transformation vectors comprising the polynucleotides of the invention, as well as plants and host cells transformed with the polynucleotides, are described. Methods of using the polynucleotides to enhance the resistance of plants to imidazolinone herbicides, and methods for controlling weeds in the vicinity of herbicide resistant plants are also described.
Description
Section 29 Regulation 3.2(2) AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Application Number: Lodged: Invention Title: Herbicide-resistant sunflower plants, plynucleotides encoding herbicide resistant acetohydroxy acid synthase large subunit proteins, and methods of use The following statement is a full description of this invention, including the best method of performing it known to us: P111AHAU/0710 HERBICIDE-RESISTANT SUNFLOWER PLANTS, POLYNUCLEOTIDES ENCODING HERBICIDE-RESISTANT ACETOHYDROXYACID SYNTHASE LARGE SUBUNIT PROTEINS, AND METHODS OF USE FIELD OF THE INVENTION [00011 This invention relates to the field of agricultural biotechnology, particularly to herbicide-resistant sunflower plants and novel polynucleotide sequences that encode wild type and imidazolinone-resistant sunflower acetohydroxyacid synthase large subunit proteins. BACKGROUND OF THE INVENTION 10002j Acetohydroxyacid synthase (AHAS; EC 4.1.3.18, also known as acetolactate synthase or ALS), is the first enzyme that catalyzes the biochemical synthesis of the branched chain amino acids valine, leucine and isoleucine (Singh (1999) "Biosynthesis of valine, leucine and isoleucine," in Plant Amino Acid, Singh, B. K., ed., Marcel Dekker Inc. New York, N.Y., pp. 227-247). AHAS is the site of action of five structurally diverse herbicide families including the sulfonylureas (Tan et al (2005) Pest Manag. Sci. 61:246 57; Mallory-Smith and Retzinger (2003) Weed Technology 17:620-626; LaRossa and Falco (1984) Trends Biotechnol. 2:158-161), the imidazolinones (Shaner et al. (1984) Plant Physiol. 76:545-546), the triazolopyrimidines (Subramanian and Gerwick (1989) "Inhibition of acetolactate synthase by triazolopyrimidines," in Biocatalysis in Agricultural Biotechnology, Whitaker, J. R. and Sonnet, P. E. eds., ACS Symposium Series, American Chemical Society, Washington, D.C., pp. 277-288), the pyrimidinyloxybenzoates (Subramanian et al. (1990) Plant Physiol. 94: 239-244) and the sulfonylamino-carbonyltriazolinones (Tan et al. (2005) Pest Manag. Sci. 61:246-57; Mallory-Smith and Retzinger (2003) Weed Technology 17:620-626). Imidazolinone and sulfonylurea herbicides are widely used in modern agriculture due to their effectiveness at very low application rates and relative non-toxicity in animals. By inhibiting AHAS activity, these families of herbicides prevent further growth and development of susceptible plants including many weed species. Several examples of commercially available imidazolinone herbicides are PURSUIT@ (imazethapyr), SCEPTER® (imazaquin) and ARSENAL® (imazapyr). Examples of sulfonylurea herbicides are chlorsulfuron, metsulfuron methyl, sulfometuron methyl, chlorimuron ethyl, thifensulfuron methyl, tribenuron methyl, bensulfuron methyl, nicosulfuron, ethametsulfuron methyl, rimsulfuron, triflusulfuron methyl, triasulfuron, primisulfuron methyl, cinosulfuron, amidosulfuron, flazasulfuron, imazosulfuron, pyrazosulfuron ethyl and halosulfuron. [00031 Due to their high effectiveness and low-toxicity, imidazolinone herbicides are favored for application by spraying over the top of a wide area of vegetation. The ability to spray a herbicide over the top of a wide range of vegetation decreases the costs associated with plantation establishment and maintenance, and decreases the need for site preparation prior to use of such chemicals. Spraying over the top of a desired tolerant species also results in the ability to achieve maximum yield potential of the desired species due to the absence of competitive species. However, the ability to use such spray over techniques is dependent upon the presence of imidazolinone-resistant species of the desired vegetation in the spray over area. [00041 Among the major agricultural crops, some leguminous species such as soybean are naturally resistant to imidazolinone herbicides due to their ability to rapidly metabolize the herbicide compounds (Shaner and Robinson (1985) Weed Sci. 33:469-471). Other crops such as corn (Newhouse et al. (1992) Plant Physiol. 100:882886) and rice (Barrett et al. (1989) Crop Safenersfor Herbicides, Academic Press, New York, pp. 195-220) are somewhat susceptible to imidazolinone herbicides. The differential sensitivity to the imidazolinone herbicides is dependent on the chemical nature of the particular herbicide and differential metabolism of the compound from a toxic to a non-toxic form in each plant (Shaner et al. (1984) Plant Physiol. 76:545-546; Brown et al., (1987) Pestic. Biochem. Physiol. 27:24-29). Other plant physiological differences such as absorption and translocation also play an important role in sensitivity (Shaner and Robinson (1985) Weed Sci. 33:469-471). 10005j Plants resistant to imidazolinones, sulfonylureas and triazolopyrimidines have been successfully produced using seed, microspore, pollen, and callus mutagenesis in Zea mays, A rabidopsis thaliana, Brassica napus (i.e., canola) Glycine max, Nicotiana tabacum, and Oryza sativa (Sebastian et al. (1989) Crop Sci. 29:1403-1408; Swanson et 2 al., 1989 Theor. Apple. Genet. 78:525-530; Newhouse et al. (1991) Theor. Apple. Genet. 83:65-70; Sathasivan et al (1991) Plant Physiol. 97:1044-1050; Mourand et al (1993) J Heredity 84:91-96; U.S. Patent No. 5,545,822). In all cases, a single, partially dominant nuclear gene conferred resistance. Four imidazolinone resistant wheat plants were also previously isolated following seed mutagenesis of Triticum aestivum L. cv. Fidel (Newhouse et al. (1992) Plant Physiol. 100:882-886). Inheritance studies confirmed that a single, partially dominant gene conferred resistance. Based on allelic studies, the authors concluded that the mutations in the four identified lines were located at the same locus. One of the Fidel cultivar resistance genes was designated FS-4 (Newhouse et al. (1992) Plant Physiol. 100: 882-886). [0006] Naturally occurring plant populations that were discovered to be resistant to imidazolinone and/or sulfonylurea herbicides have also been used to develop herbicide resistant sunflower breeding lines. Recently, two sunflower lines that are resistant to a sulfonylurea herbicide were developed using germplasm originating from a wild population of common sunflower (Helianthus annuus) as the source of the herbicide resistance trait (Miller and Al-Khatib (2004) Crop Sci. 44:1037-1038). Previously, White et al. ((2002) Weed Sci. 50:432-437) had reported that individuals from a wild population of common sunflower from South Dakota, U.S.A. were cross-resistant to an imidazolinone and a sulfonylurea herbicide. Analysis of a portion of the coding region of the acetohydroxyacid synthase large subunit (AHASL) genes of individuals from this population revealed a point mutation that results in an Ala-to-Val amino acid substitution in the sunflower AHASL protein that corresponds to Ala 205 in the wild-type Arabidopsis thaliana AHASL protein (White et al. (2003) Weed Sci. 51:845-853). [0007] Computer-based modeling of the three dimensional conformation of the AHAS-inhibitor complex predicts several amino acids in the proposed inhibitor binding pocket as sites where induced mutations would likely confer selective resistance to imidazolinones (Ott et al. (1996) J Mol. Biol. 263:359-368). Wheat plants produced with some of these rationally designed mutations in the proposed binding sites of the AHAS enzyme have in fact exhibited specific resistance to a single class of herbicides (Ott et al. (1996) J Mol. BioL 263:359-368). 3 [00081 Plant resistance to imidazolinone herbicides has also been reported in a number of patents. U.S. Patent Nos. 4,761,373, 5,331,107, 5,304,732, 6,211,438, 6,211,439 and 6,222,100 generally describe the use of an altered AHAS gene to elicit herbicide resistance in plants, and specifically discloses certain imidazolinone resistant corn lines. U.S. Patent No. 5,013,659 discloses plants exhibiting herbicide resistance due to mutations in at least one amino acid in one or more conserved regions. The mutations described therein encode either cross-resistance for imidazolinones and sulfonylureas or sulfonylurea-specific resistance, but imidazolinone-specific resistance is not described. U.S. Patent No. 5,731,180 and U.S. Patent No. 5,767,361 discuss an isolated gene having a single amino acid substitution in a wild-type monocot AHAS amino acid sequence that results in imidazolinone-specific resistance. In addition, rice plants that are resistant to herbicides that interfere with AHAS have been developed by mutation breeding and also by the selection of herbicide resistant plants from a pool of rice plants produced by anther culture. See, U.S. Patent Nos. 5,545,822, 5,736,629, 5,773,703, 5,773,704, 5,952,553 and 6,274,796. [00091 In plants, as in all other organisms examined, the AHAS enzyme is comprised of two subunits: a large subunit (catalytic role) and a small subunit (regulatory role) (Duggleby and Pang (2000) J. Biochem. MoL. Biol. 33:1-36). The AHAS large subunit (also referred to herein as AHASL) may be encoded by a single gene as in the case of Arabidopsis and rice or by multiple gene family members as in maize, canola, and cotton. Specific, single-nucleotide substitutions in the large subunit confer upon the enzyme a degree of insensitivity to one or more classes of herbicides (Chang and Duggleby (1998) Biochem J. 333:765-777). 100101 For example, bread wheat, Triticum aestivum L., contains three homoeologous acetohydroxyacid synthase large subunit genes. Each of the genes exhibit significant expression based on herbicide response and biochemical data from mutants in each of the three genes (Ascenzi et al. (2003) International Society of Plant Molecular Biologists Congress, Barcelona, Spain, Ref. No. S10-17). The coding sequences of all three genes share extensive homology at the nucleotide level (WO 03/014357). Through sequencing the AHASL genes from several varieties of Triticum aestivum, the molecular basis of herbicide tolerance in most IMI-tolerant (imidazolinone-tolerant) lines was found to be the 4 mutation S653(At)N, indicating a serine to asparagine substitution at a position equivalent to the serine at amino acid 653 in Arabidopsis thaliana (WO 03/01436; WO 03/014357). This mutation is due to a single nucleotide polymorphism (SNP) in the DNA sequence encoding the AHASL protein. [00111 Given their high effectiveness and low-toxicity, imidazolinone herbicides are favored for agricultural use. However, the ability to use imidazolinone herbicides in a particular crop production system depends upon the availability of imidazolinone-resistant varieties of the crop plant of interest. To produce such imidazolinone-resistant varieties, plant breeders need to develop breeding lines with the imidazolinone-resistance trait. Thus, additional imidazolinone-resistant breeding lines and varieties of crop plants; as well as methods and compositions for the production and use of imidazolinone-resistant breeding lines and varieties, are needed, SUMMARY OF THE INVENTION [0012] The present invention provides sunflower plants having increased resistance to herbicides when compared to a wild-type sunflower plant. In particular, the sunflower plants of the invention have increased resistance to imidazolinone and sulfonylurea herbicides, when compared to a wild-type sunflower plant. The herbicide resistant sunflower plants of the invention comprise at least one copy of a gene or polynucleotide that encodes a herbicide-resistant acetohydroxyacid synthase large subunit 1 (AHASLI). Such a herbicide-resistant AHASLI protein comprises a leucine, alanine, threonine, histidine, arginine, or isoleucine at amino acid position 182 or equivalent position. The herbicide-resistant sunflower plant of the invention can contain one, two, three, four, or more copies of a gene or polynucleotide encoding a herbicide-resistant AHASL1 protein of the invention. The sunflower plants of the invention also include seeds and progeny plants that comprise at least one copy of a gene or polynucleotide encoding a herbicide resistant AHASLI protein of the invention. [0013] In one embodiment, the present invention provides A seed of a sunflower plant, wherein said sunflower plant: (a) is a plant of line MUT28, a representative sample of seed of the line having been deposited under ATCC Patent Deposit Number PTA-6084; 5 (b) is a progeny of a plant of line MUT28; (c) is a progeny of line MUT28 and a plant of a second different sunflower line; (d) is a mutant, recombinant, or a genetically engineered derivative of line MUT28 or of any progeny of a plant of line MUT28; or (e) is a plant that is a descendant of any one of the plants of (a)-(d), wherein said sunflower plant comprises a MUT28 herbicide-tolerant acetohydroxyacid synthase large subunit 1 (AHASL1) polynucleotide encoding an AHASLi protein comprising a leucine, an alanine, a threonine, a histidine, an arginine, or an isoleucine at amino acid position 182 or equivalent position relative to the amino acid sequence set forth in SEQ ID NO:4, wherein said sunflower plant exhibits increased tolerance to an imidazolinone herbicide as compared to that of a wild-type sunflower plant, wherein said seed comprises a seed treatment. [0014] The present invention further provides a seed of a transformed sunflower plant comprising stably incorporated in its genome a polynucleotide construct comprising an AHASL1 polynucleotide operably linked to a promoter that drives expression in a plant cell, wherein the AHASLI polynucleotide encodes an AHASL1 protein comprising a leucine, an alanine, a threonine, a histidine, an arginine, or an isoleucine at amino acid position 182 or equivalent position relative to the amino acid sequence set forth in SEQ ID NO:4, wherein the tolerance of said transformed plant to an herbicide is increased when compared to that of an untransformed plant, wherein said seed comprises the polynucleotide construct, and wherein said seed comprises a seed treatment. [00151 The present invention further provides isolated polynucleotides and isolated polypeptides for sunflower (Helianthus annuus) AHASLI proteins. The polynucleotides of the invention encompass nucleotide sequences that encode herbicide-resistant and wild type AHASLI proteins. The herbicide-resistant AHASLI proteins of the invention are imidazolinone-resistant AHASLI proteins that possess a proline-to-leucine substitution at position 182 in their respective amino acid sequences, when compared to the corresponding wild-type amino acid sequence. The polynucleotides of the invention encompass the nucleotide sequences set forth in SEQ ID NOS: 1 and 3, nucleotide sequences encoding the amino acid sequences set forth in SEQ ID NOS: 2 and 4, and fragments and variants of said nucleotide sequences that encode proteins comprising 6 AHAS activity. The polynucleotides of the invention further encompass nucleotide sequences that encode mature forms of the AHASLI proteins described above particularly the nucleotides sequences SEQ ID NOS: 5 and 7, nucleotide sequences encoding the amino acid sequences set forth in SEQ ID NOS: 6 and 8, and fragments and variants of said nucleotide sequences that encode proteins comprising AHAS activity. Such mature forms of AHASLI proteins lack the chloroplast transit peptide that is part of the full length AHASLI proteins. [00161 The present invention provides expression cassettes for expressing the polynucleotides of the invention in plants, plant cells, and other, non-human host cells. The expression cassettes comprise a promoter expressible in the plant, plant cell, or other host cells of interest operably linked to a polynucleotide of the invention that encodes either a wild-type or herbicide-resistant AHASL 1 protein. If necessary for targeting expression to the chloroplast, the expression cassette can also comprise an operably linked chloroplast-targeting sequence that encodes of a chloroplast transit peptide to direct an expressed AHASL1 protein to the chloroplast. The expression cassettes of the invention find use in a method for enhancing the herbicide tolerance of a plant and a host cell. The method involves transforming the plant or host cell with an expression cassette of the invention, wherein the expression cassette comprises a promoter that is expressible in the plant or host cell of interest and the promoter is operably linked to a polynucleotide of the invention that encodes an herbicide-resistant AHASL1 protein of the invention. The method further comprises regenerating a transformed plant from the transformed plant cell. [00171 The present invention provides a method for increasing AHAS activity in a plant comprising transforming a plant cell with a polynucleotide construct comprising a nucleotide sequence operably linked to a promoter that drives expression in a plant cell and regenerating a transformed plant from the transformed plant cell. The nucleotide sequence is selected from those nucleotide sequences that encode the herbicide-resistant or wild-type AHASL1 proteins of the invention, particularly the nucleotide sequences set forth in SEQ ID NOS: 1, 3, 5, and 7, nucleotide sequences encoding the amino acid sequences set forth in SEQ ID NOS: 2, 4, 6, and 8, and fragments and variants thereof. A 7 plant produced by this method comprises increased AHAS activity, when compared to an untransformed plant. [0018] The present invention provides a method for producing a herbicide-resistant plant comprising transforming a plant cell with a polynucleotide construct comprising a nucleotide sequence operably linked to a promoter that drives expression in a plant cell and regenerating a transformed plant from said transformed plant cell. The nucleotide sequence is selected from those nucleotide sequences that encode the herbicide-resistant AHASLl proteins of the invention, particularly the nucleotide sequences set forth in SEQ ID NOS: 1 and 5, nucleotide sequences encoding the amino acid sequences set forth in SEQ ID NOS: 2 and 6, and fragments and variants thereof, including, but not limited to, the mature forms of the herbicide -resistant AHASL1 proteins of the invention. A herbicide-resistant plant produced by this method comprises enhanced resistance to at least one herbicide, particularly an imidazolinone or sulfonylurea herbicide, when compared to an untransformed plant. [0019] The present invention provides a method for enhancing herbicide-tolerance in a herbicide-tolerant plant. The method finds use in enhancing the resistance of a plant that already is resistant to a level of a herbicide that would kill or significantly injure a wild type plant. Such a herbicide-tolerant plant can be a herbicide-tolerant plant that has been genetically engineered for herbicide-tolerance or a herbicide-tolerant plant that was developed by means that do not involve recombinant DNA such as, for example, the MUT28 sunflower plants of the present invention. The method comprises transforming a herbicide-tolerant plant with a polynucleotide construct comprising a nucleotide sequence operably linked to a promoter that drives expression in a plant cell and regenerating a transformed plant from the transformed plant cell. The nucleotide sequence is selected from those nucleotide sequences that encode the herbicide-resistant AHASLI proteins of the invention, particularly the nucleotide sequences set forth in SEQ ID NO: 1 and 5, nucleotide sequences encoding the amino acid sequences set forth in SEQ ID NO: 2 and 6, and fragments and variants thereof. [00201 The present invention provides transformation vectors comprising a selectable marker gene of the invention. The selectable marker gene comprises a promoter that drives expression in a host cell operably linked to a polynucleotide comprising a 8 nucleotide sequence that encodes an herbicide-resistant AHASL I protein of the invention. The transformation vector can additionally comprise a gene of interest to be expressed in the host cell and can also, if desired, include a chloroplast-targeting sequence that is operably linked to the polynucleotide of the invention. 10021] The text of this paragraph has been deleted. [0022] The text of this paragraph has been deleted. 100231 The text of this paragraph has been deleted. [0024] The text of this paragraph has been deleted. [00251 The text of this paragraph has been deleted. BRIEF DESCRIPTION THE DRAWINGS [0026] Figure 1 is a nucleotide sequence alignment of the complete coding sequences of the herbicide-resistant sunflower AHASLI gene (SEQ ID NO: 1), the wild-type sunflower AHASLI gene (SEQ ID NO: 3) and a herbicide-resistant AHASLI gene from Xanthium sp. (SEQ ID NO: 9, GenBank Accession No. U16280). In the figure, 1248-3, HA89, and Xanthium refer to SEQ ID NOS: 1, 3, and 9, respectively. The asterisk indicates the site of the single mutation found in the herbicide-resistant sunflower AHASL 1 coding sequence. The mutation is a C-to-T transition in nucleotide 545 (codon 182) of SEQ ID NO: 1. Light-shaded regions indicate that the nucleotide at that position is conserved across the three aligned sequences. Dark-shaded regions indicate that the nucleotide at that position is conserved in two of the three sequences. [0027] Figure 2 is an amino acid sequence alignment of the herbicide-resistant sunflower AHASLI protein (SEQ ID NO: 2), the wild-type sunflower AHASL1 protein (SEQ ID NO: 4) and a herbicide-resistant AHASLI protein from Xanthium sp. (SEQ ID NO: 10, GenBank Accession No. U16280). In the figure, 1248-3, HA89, and Xanthium refer to SEQ ID NOS: 2, 4, and 10, respectively. The asterisk indicates the site of the single amino acid substitution found in the herbicide-resistant sunflower AHASL1 protein. In the herbicide resistant protein (SEQ ID NO: 2) the proline at amino acid number 182 of the wild-type protein (SEQ ID NO: 4) is substituted with a leucine. Light shaded regions indicate that the amino acid at that position is conserved across the three aligned sequences. Dark-shaded regions indicate that the amino acid at that position is 9 conserved in two of the three sequences. Amino acids represented by bold-face type indicate conservative amino acid substitutions. SEQUENCE LISTING [0028] The nucleotide and amino acid sequences listed in the accompanying sequence listing are shown using standard letter abbreviations for nucleotide bases, and three-letter code for amino acids. The nucleotide sequences follow the standard convention of beginning at the 5' end of the sequence and proceeding forward (i.e., from left to right in each line) to the 3' end. Only one strand of each nucleic acid sequence is shown, but the complementary strand is understood to be included by any reference to the displayed strand. The amino acid sequences follow the standard convention of beginning at the amino terminus of the sequence and proceeding forward (i.e., from left to right in each line) to the carboxy terminus. [00291 SEQ ID NO: 1 sets forth the nucleotide sequence encoding the herbicide resistant AHASLI protein from sunflower. By comparison to GenBank Accession No. U16280, the mature form of the AHASL1 protein is encoded by the nucleotide sequence corresponds to nucleotides 253 to 1965 of SEQ ID NO: 1, and the transit peptide is encoded by nucleotides 1 to 252, [00301 SEQ ID NO: 2 sets forth the amino acid sequence of the herbicide-resistant AHASL1 protein from sunflower. By comparison to GenBank Accession No. U16280, the amino acid sequence of the mature form of the AHASL1 protein corresponds to amino acids 85 to 655 of SEQ ID NO: 2, and the transit peptide corresponds to amino acids 1 to 84. [0031] SEQ ID NO: 3 sets forth the nucleotide sequence encoding the AHASL1 protein from sunflower. By comparison to GenBank Accession No. Ul 6280, the mature form of the AHASL 1 protein is encoded by the nucleotide sequence corresponds to nucleotides 253 to 1965 of SEQ ID NO: 3, and the transit peptide is encoded by nucleotides 1 to 252. [0032] SEQ ID NO: 4 sets forth the amino acid sequence of the AHASLI protein from sunflower. By comparison to GenBank Accession No. U16280, the amino acid sequence 10 of the mature form of the AHASLI protein corresponds to amino acids 85 to 655 of SEQ ID NO: 4, and the transit peptide corresponds to amino acids I to 84. [00331 SEQ ID NO: 5 sets forth the nucleotide sequence encoding the mature, herbicide-resistant AHASL1 protein from sunflower. This nucleotide sequence corresponds to nucleotides 253 to 1965 of SEQ ID NO: 1. [00341 SEQ ID NO: 6 sets forth the amino acid sequence of the mature, herbicide resistant AHASLI protein from sunflower. This amino acid sequence corresponds to amino acids 85 to 655 of SEQ ID NO: 2. [0035] SEQ ID NO: 7 sets forth the nucleotide sequence encoding the mature AHASLI protein from sunflower. This nucleotide sequence corresponds to nucleotides 253 to 1965 of SEQ ID NO: 3. [0036J SEQ ID NO: 8 sets forth the amino acid sequence of the mature AHASLI protein from sunflower. This amino acid sequence corresponds to amino acids 85 to 655 of SEQ ID NO: 4. [0037] SEQ ID NO: 9 sets forth the nucleotide sequence of GenBank Accession No. U16280. 10038] SEQ ID NO: 10 sets forth the amino acid sequence of GenBank Accession No. U16280. [0039I SEQ ID NO: 11 sets forth the nucleotide sequence of the ALS 1-IF primer that is described in Example 2. 100401 SEQ ID NO: 12 sets forth the nucleotide sequence of the ALS I-IR primer that is described in Example 2. [0041J SEQ ID NO: 13 sets forth the nucleotide sequence of the ALS 1 -2F primer that is described in Example 2. [00421 SEQ ID NO: 14 sets forth the nucleotide sequence of the ALS1-2R primer that is described in Example 2. [00431 SEQ ID NO: 15 sets forth the nucleotide sequence of the ALS1-3F primer that is described in Example 2. [0044] SEQ ID NO: 16 sets forth the nucleotide sequence of the ALS I-3R primer that is described in Example 2. 11 10045] SEQ ID NO: 17 sets forth the nucleotide sequence of the ALS-3F primer that is described in Example 2, [00461 SEQ ID NO: 18 sets forth the nucleotide sequence of the SUNALS 1 F primer that is described in Example 2. 10047] SEQ ID NO: 19 sets forth the nucleotide sequence of the ALS-6R primer that is described in Example 2. DETAILED DESCRIPTION OF THE INVENTION 100481 The present invention relates to sunflower plants having increased resistance to herbicides when compared to a wild-type sunflower plant. Herbicide resistant sunflower plants were produced as described hereinbelow by exposing wild-type (with respect to herbicide resistance) sunflower plants to a mutagen, allowing the plants to mature and reproduce, and selecting progeny plants that displayed enhanced resistance to an imidazolinone herbicide, relative to the resistance of a wild-type sunflower plant. The invention provides a herbicide resistant sunflower line that is referred to herein as MUT28. 10049] From the MUT28 herbicide-resistant sunflower plants and wild-type sunflower plants, the coding region of an acetohydroxyacid synthase large subunit gene (designated as AHASL1) was isolated by polymerase chain reaction (PCR) amplification and sequenced. By comparing the polynucleotide sequences of the herbicide resistant and wild-type sunflower plants, it was discovered that the coding region of the AHASLI polynucleotide sequence from the herbicide resistant sunflower plant differed from the AHASL1 polynucleotide sequence of the wild type plant by a single nucleotide, a C-to-T transition at nucleotide 545 (Figure 1). This C-to-T transition in the AHASL1 polynucleotide sequence results in a Pro-to-Leu substitution at amino acid 182 in a conserved region of the predicted amino acid sequence of the AHASL1 protein, relative to the amino acid sequence of the wild-type AHASL1 protein (Figure 2). A variety of amino acid substitutions for the proline in this conserved region of the plant AHASL proteins, including the Pro-to-Leu substitution, are known to confer on a plant, which comprises such an AHASL protein, resistance to imidazolinone and/or sulfonylurea herbicides. See, Boutsalis et al (1999) Pestic. Sci. 55:507-516; Guttieri et al. (1992) Weed Sci. 40:670 12 678; Guttieri et aL (1995) Weed Sci. 43:143-178; and U.S. Patent No. 5,141,870; all of which are herein incorporated by reference. See also, Example 3, below. [00501 As used herein, unless indicated otherwise or apparent from the context, the term "plant" includes, but is not limited to, plant cells, plant protoplasts, plant cell tissue cultures from which plants can be regenerated, plant calli, plant clumps, plant cells that are intact in plants, or parts of plants such as, for example, embryos, pollen, ovules, seeds, cotyledons, leaves, stems, flowers, branches, petioles, fruit, roots, root tips, anthers, and the like. [00511 The invention further relates to isolated polynucleotide molecules comprising nucleotide sequences that encode acetohydroxyacid synthase large subunit (AHASL) proteins and to such AHASL proteins. The invention discloses the isolation and nucleotide sequence of a polynucleotide encoding a herbicide-resistant sunflower AHASL 1 protein from an herbicide-resistant sunflower plant that was produced by chemical mutagenesis of wild-type sunflower plants. The herbicide-resistant AHASL1 proteins of the invention possess a proline-to-leucine substitution at position 182 in their respective amino acid sequences, when compared to the corresponding wild-type amino acid sequence. The invention further discloses the isolation and nucleotide sequence of a polynucleotide molecule encoding a wild-type sunflower AHASL1 protein. 10052] The present invention provides isolated polynucleotide molecules that encode AHASLI proteins from sunflower (Helianthus annuus L.). Specifically, the invention provides isolated polynucleotide molecules comprising: the nucleotide sequences set forth in SEQ ID NOS: 1 and 3, nucleotide sequences encoding AHASLI proteins comprising the amino acid sequences set forth in SEQ ID NOS: 2 and 4, and fragments and variants of such nucleotide sequences that encode functional AHASL1 proteins. 10053] In addition, the present invention provides isolated polynucleotides encoding the mature AHASLI proteins. The mature AHASLl proteins of the invention lack the chloroplast transit peptide that is found at the N-terminal end of each of the AHASL1 proteins but retain AHAS activity. In particular, the polynucleotides of the invention comprise a nucleotide sequence selected from the group consisting of the nucleotide sequences set forth in SEQ ID NOS: 5 and 7, nucleotide sequences encoding the amino acid sequences set forth in SEQ ID NOS: 6 and 8, and fragments and variants of these 13 nucleotide sequences that encode a mature AHASLI polypeptide comprising AHAS activity. 10054] The isolated herbicide-resistant AHASLI polynucleotide molecules of the invention comprise nucleotide sequences that encode herbicide-resistant AHASL I proteins. Such polynucleotide molecules can be used in polynucleotide constructs for the transformation of plants, particularly crop plants, to enhance the resistance of the plants to herbicides, particularly herbicides that are known to inhibit AHAS activity, more particularly imidazolinone herbicides. Such polynucleotide constructs can be used in expression cassettes, expression vectors, transformation vectors, plasmids and the like. The transgenic plants obtained following transformation with such polynucleotide constructs show increased resistance to AHAS-inhibiting herbicides such as, for example, imidazolinone and sulfonylurea herbicides. [00551 Compositions of the invention include nucleotide sequences that encode AHASLI proteins. In particular, the present invention provides for isolated polynucleotide molecules comprising nucleotide sequences encoding the amino acid sequences shown in SEQ ID NOS: 2, 4, 6, and 8, and fragments and variants thereof that encode polypeptides comprising AHAS activity. Further provided are polypeptides having an amino acid sequence encoded by a polynucleotide molecule described herein, for example those set forth in SEQ ID NOS: 1, 3, 5, and 7, and fragments and variants thereof that encode polypeptides comprising AHAS activity. 10056] The invention encompasses isolated or substantially purified nucleic acid or protein compositions. An "isolated" or "purified" polynucleotide molecule or protein, or biologically active portion thereof, is substantially or essentially free from components that normally accompany or interact with the polynucleotide molecule or protein as found in its naturally occurring environment. Thus, an isolated or purified polynucleotide molecule or protein is substantially free of other cellular material, or culture medium when produced by recombinant techniques, or substantially free of chemical precursors or other chemicals when chemically synthesized. Preferably, an "isolated" nucleic acid is free of sequences (preferably protein encoding sequences) that naturally flank the nucleic acid (i.e., sequences located at the 5' and 3' ends of the nucleic acid) in the genomic DNA of the organism from which the nucleic acid is derived. For example, in various 14 embodiments, the isolated polynucleotide molecule can contain less than about 5 kb, 4 kb, 3 kb, 2 kb, I kb, 0.5 kb, or 0.1 kb of nucleotide sequences that naturally flank the polynucleotide molecule in genomic DNA of the cell from which the nucleic acid is derived. A protein that is substantially free of cellular material includes preparations of protein having less than about 30%, 20%, 10%, 5%, or 1% (by dry weight) of contaminating protein. When the protein of the invention or biologically active portion thereof is recombinantly produced, preferably culture medium represents less than about 30%, 20%, 10%, 5%, or 1% (by dry weight) of chemical precursors or non-protein-of interest chemicals. 100571 The present invention provides isolated polypeptides comprising AHASL1 proteins. The isolated polypeptides comprise an amino acid sequence selected from the group consisting of the amino acid sequences set forth in SEQ ID NOS: 2 and 4, the amino acid sequences encoded by nucleotide sequences set forth in SEQ ID NOS: 1 and 3, and functional fragments and variants of said amino acid sequences that encode an AHASL1 polypeptide comprising AHAS activity. By "functional fragments and variants" is intended fragments and variants of the exemplified polypeptides that comprise AHAS activity. [00581 Additionally provided are isolated polypeptides comprising the mature forms of the AHASLI proteins of the invention. Such isolated polypeptides comprise an amino acid sequence selected from the group consisting of the amino acid sequences set forth in SEQ ID NOS: 6 and 8, the amino acid sequences encoded by the nucleotide sequences set forth in SEQ ID NOS: 5 and 7, and functional fragments and variants of said amino acid sequences that encode polypeptides comprising AHAS activity. [0059J In certain embodiments of the invention, the methods involve the use of herbicide-tolerant or herbicide-resistant plants. By an "herbicide-tolerant" or "herbicide resistant" plant, it is intended that a plant that is tolerant or resistant to at least one herbicide at a level that would normally kill, or inhibit the growth of, a normal or wild type plant. In one embodiment of the invention, the herbicide-tolerant plants of the invention comprise a herbicide-tolerant or herbicide-resistant AHASL protein. By "herbicide-tolerant AHASL protein" or "herbicide-resistant AHASL protein", it is intended that such an AHASL protein displays higher AHAS activity, relative to the 15 AHAS activity of a wild-type AHASL protein, when in the presence of at least one herbicide that is known to interfere with AHAS activity and at a concentration or level of the herbicide that is to known to inhibit the AHAS activity of the wild-type AHASL protein. Furthermore, the AHAS activity of such a herbicide-tolerant or herbicide resistant AHASL protein may be referred to herein as "herbicide-tolerant" or "herbicide resistant" AHAS activity. [0060] For the present invention, the terms "herbicide-tolerant" and "herbicide resistant" are used interchangeable and are intended to have an equivalent meaning and an equivalent scope. Similarly, the terms "herbicide-tolerance" and "herbicide-resistance" are used interchangeable and are intended to have an equivalent meaning and an equivalent scope. Likewise, the terms "imidazolinone-resistant" and "imidazolinone resistance" are used interchangeable and are intended to be of an equivalent meaning and an equivalent scope as the terms "imidazolinone-tolerant" and "imidazolinone-tolerance", respectively. [00611 The invention encompasses herbicide-resistant AHASLi polynucleotides and herbicide-resistant AHASL1 proteins. By "herbicide-resistant AHASL1 polynucleotide" is intended a polynucleotide that encodes a protein comprising herbicide-resistant AHAS activity. By "herbicide-resistant AHASLI protein" is intended a protein or polypeptide that comprises herbicide-resistant AHAS activity. [0062] Further, it is recognized that a herbicide-tolerant or herbicide-resistant AHASL protein can be introduced into a plant by transforming a plant or ancestor thereof with a nucleotide sequence encoding a herbicide-tolerant or herbicide-resistant AHASL protein. Such herbicide-tolerant or herbicide-resistant AHASL proteins are encoded by the herbicide-tolerant or herbicide-resistant AHASL polynucleotides. Alternatively, a herbicide-tolerant or herbicide-resistant AHASL protein may occur in a plant as a result of a naturally occurring or induced mutation in an endogenous AHASL gene in the genome of a plant or progenitor thereof, [0063] The present invention provides plants, plant tissues, plant cells, and host cells with increased resistance or tolerance to at least one herbicide, particularly an imidazolinone or sulfonylurea herbicide. The preferred amount or concentration of the herbicide is an "effective amount" or "effective concentration." By "effective amount" 16 and "effective concentration" is intended an amount and concentration, respectively, that is sufficient to kill or inhibit the growth of a similar, wild-type, plant, plant tissue, plant cell, or host cell, but that said amount does not kill or inhibit as severely the growth of the herbicide-resistant plants, plant tissues, plant cells, and host cells of the present invention. Typically, the effective amount of a herbicide is an amount that is routinely used in agricultural production systems to kill weeds of interest. Such an amount is known to those of ordinary skill in the art. [0064] The herbicides of the present invention are those that interfere with the activity of the AHAS enzyme such that AHAS activity is reduced in the presence of the herbicide. Such herbicides may also referred to herein as "AHAS-inhibiting herbicides" or simply "AHAS inhibitors." As used herein, an "AHAS-inhibiting herbicide" or an "AHAS inhibitor" is not meant to be limited to single herbicide that interferes with the activity of the AHAS enzyme. Thus, unless otherwise stated or evident from the context, an "AHAS inhibiting herbicide" or an "AHAS inhibitor" can be a one herbicide or a mixture of two, three, four, or more herbicides, each of which interferes with the activity of the AHAS enzyme. [0065J By "similar, wild-type, plant, plant tissue, plant cell or host cell" is intended a plant, plant tissue, plant cell, or host cell, respectively, that lacks the herbicide-resistance characteristics and/or particular polynucleotide of the invention that are disclosed herein. The use of the term "wild-type" is not, therefore, intended to imply that a plant, plant tissue, plant cell, or other host cell lacks recombinant DNA in its genome, and/or does not possess herbicide resistant characteristics that are different from those disclosed herein. 100661 As used herein unless clearly indicated otherwise, the term "plant" intended to mean a plant any developmental stage, as well as any part or parts of a plant that may be attached to or separate from a whole intact plant. Such parts of a plant include, but are not limited to, organs, tissues, and cells of a plant. Examples of particular plant parts include a stem, a leaf, a root, an inflorescence, a flower, a floret, a fruit, a pedicle, a peduncle, a stamen, an anther, a stigma, a style, an ovary, a petal, a sepal, a carpel, a root tip, a root cap, a root hair, a leaf hair, a seed hair, a pollen grain, a microspore, a cotyledon, a hypocotyl, an epicotyl, xylem, phloem, parenchyma, endosperm, a companion cell, a 17 guard cell, and any other known organs, tissues, and cells of a plant. Furthermore, it is recognized that a seed is a plant. [0067J The plants of the present invention include both non-transgenic plants and transgenic plants. By "non-transgenic plant" is intended mean a plant lacking recombinant DNA in its genome. By "transgenic plant" is intended to mean a plant comprising recombinant DNA in its genome. Such a transgenic plant can be produced by introducing recombinant DNA into the genome of the plant. When such recombinant DNA is incorporated into the genome of the transgenic plant, progeny of the plant can also comprise the recombinant DNA. A progeny plant that comprises at least a portion of the recombinant DNA of at least one progenitor transgenic plant is also a transgenic plant. [0068] The present invention provides the herbicide-resistant sunflower line that is referred to herein as MUT28. A deposit of at least 650 seeds from sunflower line MUT28 with the Patent Depository of the American Type Culture Collection (ATCC), Mansassas, VA 20110 USA was made on June 18, 2004 and assigned ATCC Patent Deposit Number PTA-6084. On July 15, 2005, additional seeds of the MUT28 line were deposited with the ATCC to reach a total of more than 2500 seeds for ATCC Patent Deposit Number PTA 6084. The deposit will be maintained under the terms of the Budapest Treaty on the International Recognition of the Deposit of Microorganisms for the Purposes of Patent Procedure. The deposit of sunflower line MTUT28 was made for a term of at least 30 years and at least 5 years after the most recent request for the furnishing of a sample of the deposit is received by the ATCC. Additionally, Applicants have satisfied all the requirements of 37 C.F.R. §§ 1.801-1.809, including providing an indication of the viability of the sample. 10069] The present invention provides herbicide-resistant sunflower plants of the MUT28 line that were produced by a mutation breeding. Wild-type sunflower plants were mutagenized by exposing the plants to a mutagen, particularly a chemical mutagen, more particularly ethyl methanesulfonate (EMS). However, the present invention is not limited to herbicide-resistant sunflower plants that are produced by a mutagensis method involving the chemical mutagen EMS. Any mutagensis method known in the art may be used to produce the herbicide-resistant sunflower plants of the present invention. Such mutagensis methods can involve, for example, the use of any one or more of the following 18 mutagens: radiation, such as X-rays, Gamma rays (e.g., cobalt 60 or cesium 137), neutrons, (e.g., product of nuclear fission by uranium 235 in an atomic reactor), Beta radiation (e.g., emitted from radioisotopes such as phosphorus 32 or carbon 14), and ultraviolet radiation (preferably from 2500 to 2900nm), and chemical mutagens such as base analogues (e.g., 5-bromo-uracil), related compounds (e.g., 8-ethoxy caffeine), antibiotics (e.g., streptonigrin), alkylating agents (e.g., sulfur mustards, nitrogen mustards, epoxides, ethylenamines, sulfates, sulfonates, sulfones, lactones), azide, hydroxylamine, nitrous acid, or acridines. Herbicide-resistant plants can also be produced by using tissue culture methods to select for plant cells comprising herbicide-resistance mutations and then regenerating herbicide-resistant plants therefrom. See, for example, U.S. Patent Nos. 5,773,702 and 5,859,348, both of which are herein incorporated in their entirety by reference. Further details of mutation breeding can be found in "Principals of Cultivar Development" Fehr, 1993 Macmillan Publishing Company the disclosure of which is incorporated herein by reference. [0070] Analysis of the AHASLI gene of the sunflower plant of the MUT28 line revealed that mutation that results in the substitution of a leucine for the proline that is found at amino acid position 182 in the wild-type AHASL1 amino acid sequence for SEQ ID NO: 4. Thus, the present invention discloses that substituting another amino acid for the proline at position 182 can cause a sunflower plant to have enhanced resistance to a herbicide, particularly an imidazolinone and/or sulfonylurea herbicide. As disclosed in Example 3 below, proline 182 is found in a conserved region of AHASL proteins and other amino acid substitutions have been disclosed that are known to confer herbicide resistance on a plant that comprises such an AHASL protein. Accordingly, the herbicide resistant sunflower plants of the invention include, but are not limited to those sunflower plants which comprise in their genomes at least one copy of an AHASL1 polynucleotide that encodes a herbicide-resistant AHASLI protein that comprises a leucine, alanine, threonine, histidine, arginine, or isoleucine at amino acid position 182 or equivalent position. [00711 The sunflower plants of the invention further include plants that comprise, relative to the wild-type AHASLI protein, a leucine, alanine, threonine, histidine, arginine, or isoleucine at amino acid position 182 or equivalent position and one or more 19 additional amino acid substitutions in the AHASLI protein relative to the wild-type AHASLI protein, wherein such a sunflower plant has increased resistance to at least one herbicide when compared to a wild-type sunflower plant. Such sunflower plants comprise AHASLI proteins that comprise at least one member selected from the group consisting of: a threonine at amino acid position 107 or equivalent position; an aspartate or valine at amino acid position 190 or equivalent position; a leucine at amino acid position 559 or equivalent position; and an aspartate, threonine, or valine at amino acid position 638 or equivalent position. [00721 The present invention provides AHASLI proteins with amino acid substitutions at particular amino acid positions within conserved regions of the sunflower AHASLI proteins disclosed herein. Unless otherwise indicated herein, particular amino acid positions refer to the position of that amino acid in the full-length sunflower AHASLI amino acid sequences set forth in SEQ ID NOS: 2 and 4. Furthermore, those of ordinary skill will recognize that such amino acid positions can vary depending on whether amino acids are added or removed from, for example, the N-terminal end of an amino acid sequence. Thus, the invention encompasses the amino substitutions at the recited position or equivalent position (e.g., "amino acid position 182 or equivalent position"). By "equivalent position" is intended to mean a position that is within the same conserved region as the exemplified amino acid position. For example, the equivalent position in SEQ ID NO: 8 is amino acid 98 for the praline that occurs at amino acid position 182 in SEQ ID NO: 4. [0073] In addition, the present invention provides AHASLI polypeptides comprising amino acid substitutions that are known to confer resistance on a plant to at least one herbicide, particularly an imidazolinone herbicide and/or a sulfonylurea herbicide. Such AHASL1 polypeptides include, for example, those that comprise at least one member selected from the group consisting of: a leucine, alanine, threonine, histidine, arginine, or isoleucine at amino acid position 182 or equivalent position; a threonine at amino acid position 107 or equivalent position; an aspartate or valine at amino acid position 190 or equivalent position; a leucine at amino acid position 559 or equivalent position; and an aspartate, threonine, or valine at amino acid position 638 or equivalent position. The invention further provides isolated polynucleotides encoding such AHASLI polypeptides, 20 as well as expression cassettes, transformation vectors, transformed host cells, transformed plants, and methods comprising such polynucleotides. [0074] The present invention provides methods for enhancing the tolerance or resistance of a plant, plant tissue, plant cell, or other host cell to at least one herbicide that interferes with the activity of the AHAS enzyme. Preferably, such an AHAS-inhibiting herbicide is an imidazolinone herbicide, a sulfonylurea herbicide, a triazolopyrimidine herbicide, a pyrimidinyloxybenzoate herbicide, a sulfonylamino-carbonyltriazolinone herbicide, or mixture thereof More preferably, such a herbicide is an imidazolinone herbicide, a sulfonylurea herbicide, or mixture thereof. For the present invention, the imidazolinone herbicides include, but are not limited to, PURSUIT@ (imazethapyr), CADRE® (imazapic), RAPTOR® (imazamox), SCEPTER® (imazaquin), ASSERT® (imazethabenz), ARSENAL® (imazapyr), a derivative of any of the aforementioned herbicides, and a mixture of two or more of the aforementioned herbicides, for example, imazapyr/imazamox (ODYSSEY®). More specifically, the imidazolinone herbicide can be selected from, but is not limited to, 2 -(4-isopropyl-4-methyl-5-oxo-2-imidiazolin-2-yl) nicotinic acid, 2
-(
4 -isopropyl)- 4 -methyl-5-oxo-2-imidazolin-2-yl)-3-quinolinecarboxylic acid, 5-ethyl- 2
-(
4 -isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-nicotinic acid, 2-(4 isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-5-(methoxymethyl)-nicotinic acid, 2-(4 isopropyl- 4 -methyl-5-oxo-2-imidazolin-2-yl)-5-methynicotinic acid, and a mixture of methyl 6- ( 4 -isopropyl-4-methyl-5-oxo-2-imidazolin-2-yI)-m-toluate and methyl 2-(4 isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-p-toluate. The use of 5-ethyl-2-(4 isopropyl- 4 -methyl-5-oxo-2-imidazolin-2-yl)-nicotinic acid and 2- ( 4 -isopropyl-4-methyl 5-oxo-2-imidazolin-2-yl)-5- (methoxymethyl)-nicotinic acid is preferred. The use of 2
(
4 -isopropyl- 4 -methyl-5-oxo-2-imidazolin-2-yl)-5-(methoxymethyl)-nicotinic acid is particularly preferred. [00751 For the present invention, the sulfonylurea herbicides include, but are not limited to, chlorsulfuron, metsulfuron methyl, sulfometuron methyl, chlorimuron ethyl, thifensulfuron methyl, tribenuron methyl, bensulfuron methyl, nicosulfuron, ethametsulfuron methyl, rimsulfuron, triflusulfuron methyl, triasulfuron, primisulfuron methyl, cinosulfuron, amidosulfuron, flazasulfuron, imazosuifuron, pyrazosulfuron ethyl, halosulfuron, azimsulfuron, cyclosulfuron, ethoxysulfuron, flazasulfuron, flupyrsulfuron 21 methyl, foramsulfuron, iodosulfuron, oxasulfuron, mesosulfuron, prosulfliron, sulfosulfuron, trifloxysulfuron, tritosulfuron, a derivative of any of the aforementioned herbicides, and a mixture of two or more of the aforementioned herbicides. The triazolopyrimidine herbicides of the invention include, but are not limited to, cloransulam, diclosulam, florasulam, flumetsulam, metosulam, and penoxsulam. The pyrimidinyloxybenzoate herbicides of the invention include, but are not limited to, bispyribac, pyrithiobac, pyriminobac, pyribenzoxim and pyriftalid. The sulfonylamino carbonyltriazolinone herbicides include, but are not limited to, flucarbazone and propoxycarbazone. [0076] It is recognized that pyrimidinyloxybenzoate herbicides are closely related to the pyrimidinylthiobenzoate herbicides and are generalized under the heading of the latter name by the Weed Science Society of America. Accordingly, the herbicides of the present invention further include pyrimidinylthiobenzoate herbicides, including, but not limited to, the pyrimidinyloxybenzoate herbicides described above. [00771 The present invention provides methods for enhancing AHAS activity in a plant comprising transforming a plant with a polynucleotide construct comprising a promoter operably linked to an AHASLI nucleotide sequence of the invention. The methods involve introducing a polynucleotide construct of the invention into at least one plant cell and regenerating a transformed plant therefrom. The methods involve the use of a promoter that is capable of driving gene expression in a plant cell. Preferably, such a promoter is a constitutive promoter or a tissue-preferred promoter. The methods find use in enhancing or increasing the resistance of a plant to at least one herbicide that interferes with the catalytic activity of the AHAS enzyme, particularly an imidazolinone herbicide. 100781 The present invention provides expression cassettes for expressing the polynucleotides of the invention in plants, plant tissues, plant cells, and other host cells. The expression cassettes comprise a promoter expressible in the plant, plant tissue, plant cell, or other host cells of interest operably linked to a polynucleotide of the invention that comprises a nucleotide sequence encoding either a full-length (i.e. including the chloroplast transit peptide) or mature AHASL I protein (i.e. without the chloroplast transit peptide). If expression is desired in the plastids or chloroplasts of plants or plant cells, the 22 expression cassette may also comprise an operably linked chloroplast-targeting sequence that encodes a chloroplast transit peptide. 10079] The expression cassettes of the invention find use in a method for enhancing the herbicide tolerance of a plant or a host cell. The method involves transforming the plant or host cell with an expression cassette of the invention, wherein the expression cassette comprises a promoter that is expressible in the plant or host cell of interest and the promoter is operably linked to a polynucleotide of the invention that comprises a nucleotide sequence encoding an imidazolinone-resistant AHASL1 protein of the invention. [0080] The use of the term "polynucleotide constructs" herein is not intended to limit the present invention to polynucleotide constructs comprising DNA. Those of ordinary skill in the art will recognize that polynucleotide constructs, particularly polynucleotides and oligonucleotides, comprised of ribonucleotides and combinations of ribonucleotides and deoxyribonucleotides may also be employed in the methods disclosed herein. Thus, the polynucleotide constructs of the present invention encompass all polynucleotide constructs that can be employed in the methods of the present invention for transforming plants including, but not limited to, those comprised of deoxyribonucleotides, ribonucleotides, and combinations thereof. Such deoxyribonucleotides and ribonucleotides include both naturally occurring molecules and synthetic analogues. The polynucleotide constructs of the invention also encompass all forms of polynucleotide constructs including, but not limited to, single-stranded forms, double-stranded forms, hairpins, stem-and-loop structures, and the like. Furthermore, it is understood by those of ordinary skill the art that each nucleotide sequences disclosed herein also encompasses the complement of that exemplified nucleotide sequence. 10081] Furthermore, it is recognized that the methods of the invention may employ a polynucleotide construct that is capable of directing, in a transformed plant,' the expression of at least one protein, or at least one RNA, such as, for example, an antisense RNA that is complementary to at least a portion of an mRNA. Typically such a polynucleotide construct is comprised of a coding sequence for a protein or an RNA operably linked to 5' and 3' transcriptional regulatory regions. Alternatively, it is also recognized that the 23 methods of the invention may employ a polynucleotide construct that is not capable of directing, in a transformed plant, the expression of a protein or an RNA. [00821 Further, it is recognized that, for expression of a polynucleotides of the invention in a host cell of interest, the polynucleotide is typically operably linked to a promoter that is capable of driving gene expression in the host cell of interest. The methods of the invention for expressing the polynucleotides in host cells do not depend on particular promoter. The methods encompass the use of any promoter that is known in the art and that is capable of driving gene expression in the host cell of interest. [0083] The present invention encompasses AHASLI polynucleotide molecules and fragments and variants thereof. Polynucleotide molecules that are fragments of these nucleotide sequences are also encompassed by the present invention. By "fragment" is intended a portion of the nucleotide sequence encoding an AHASL1 protein of the invention. A fragment of an AHASL 1 nucleotide sequence of the invention may encode a biologically active portion of an AHASLI protein, or it may be a fragment that can be used as a hybridization probe or PCR primer using methods disclosed below. A biologically active portion of an AHASL1 protein can be prepared by isolating a portion of one of the AHASL1 nucleotide sequences of the invention, expressing the encoded portion of the AHASLI protein (e.g., by recombinant expression in vitro), and assessing the activity of the encoded portion of the AHASLI protein. Polynucleotide molecules that are fragments of an AHASLI nucleotide sequence comprise at least about 15, 20, 50, 75, 100, 200, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400,1500,1600,1700, 1800, 1900, or 1950 nucleotides, or up to the number of nucleotides present in a full-length nucleotide sequence disclosed herein (for example, 1968, 1968, 1716, and 1716 nucleotides for SEQ ID NOS: 1, 3, 5, and 7, respectively) depending upon the intended use. [00841 A fragment of an AHASL1 nucleotide sequence that encodes a biologically active portion of an AHASLI protein of the invention will encode at least about 15, 25, 30, 50, 75, 100, 125, 150, 175, 200, 250, 300, 350, 400, 450, 500, 550, 600, or 650 contiguous amino acids, or up to the total number of amino acids present in a full-length AHASL1 protein of the invention (for example, 655, 655, 571, and 571 amino acids for SEQ ID NOS: 2, 4, 6, and 8, respectively). Fragments of an AHASL1 nucleotide 24 sequence that are useful as hybridization probes for PCR primers generally need not encode a biologically active portion of an AHASL 1 protein. [00851 Polynucleotide molecules that are variants of the nucleotide sequences disclosed herein are also encompassed by the present invention. "Variants" of the AHASLI nucleotide sequences of the invention include those sequences that encode the AHASLI proteins disclosed herein but that differ conservatively because of the degeneracy of the genetic code. These naturally occurring allelic variants can be identified with the use of well-known molecular biology techniques, such as polymerase chain reaction (PCR) and hybridization techniques as outlined below. Variant nucleotide sequences also include synthetically derived nucleotide sequences that have been generated, for example, by using site-directed mutagenesis but which still encode the AHASLI protein disclosed in the present invention as discussed below. Generally, nucleotide sequence variants of the invention will have at least about 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity to a particular nucleotide sequence disclosed herein. A variant AHASL1 nucleotide sequence will encode an AHASL1 protein, respectively, that has an amino acid sequence having at least about 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity to the amino acid sequence of an AHASL 1 protein disclosed herein. [00861 In addition, the skilled artisan will further appreciate that changes can be introduced by mutation into the nucleotide sequences of the invention thereby leading to changes in the amino acid sequence of the encoded AHASL1 proteins without altering the biological activity of the AHASL1 proteins. Thus, an isolated polynucleotide molecule encoding an AHASL1 protein having a sequence that differs from that of SEQ ID NOS: 1, 3, 5, or 7, respectively, can be created by introducing one or more nucleotide substitutions, additions, or deletions into the corresponding nucleotide sequence disclosed herein, such that one or more amino acid substitutions, additions or deletions are introduced into the encoded protein. Mutations can be introduced by standard techniques, such as site directed mutagenesis and PCR-mediated mutagenesis. Such variant nucleotide sequences are also encompassed by the present invention. [0087] For example, preferably, conservative amino acid substitutions may be made at one or more predicted, preferably nonessential amino acid residues. A "nonessential" 25 amino acid residue is a residue that can be altered from the wild-type sequence of an AHASLI protein (e.g., the sequence of SEQ ID NOS: 2, 4, 6, and 8, respectively) without altering the biological activity, whereas an "essential" amino acid residue is required for biological activity. A "conservative amino acid substitution" is one in which the amino acid residue is replaced with an amino acid residue having a similar side chain. Families of amino acid residues having similar side chains have been defined in the art. These families include amino acids with basic side chains (e.g., lysine, arginine, histidine), acidic side chains (e.g., aspartic acid, glutamic acid), uncharged polar side chains (e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine), nonpolar side chains (e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan), beta branched side chains (e.g., threonine, valine, isoleucine) and aromatic side chains (e.g., tyrosine, phenylalanine, tryptophan, histidine). Such substitutions would not be made for conserved amino acid residues, or for amino acid residues residing within a conserved motif [00881 The proteins of the invention may be altered in various ways including amino acid substitutions, deletions, truncations, and insertions. Methods for such manipulations are generally known in the art. For example, amino acid sequence variants of the AHASL1 proteins can be prepared by mutations in the DNA. Methods for mutagenesis and nucleotide sequence alterations are well known in the art. See, for example, Kunkel (1985) Proc. Natl. Acad. Sci. USA 82:488-492; Kunkel et al. (1987) Methods in EnzymoL 154:367-382; U.S. Patent No. 4,873,192; Walker and Gaastra, eds. (1983) Techniques in Molecular Biology (MacMillan Publishing Company, New York) and the references cited therein. Guidance as to appropriate amino acid substitutions that do not affect biological activity of the protein of interest may be found in the model of Dayhoff et al. (1978) Atlas ofProtein Sequence and Structure (Natl. Biomed. Res. Found., Washington, D.C.), herein incorporated by reference. Conservative substitutions, such as exchanging one amino acid with another having similar properties, may be preferable. [0089] Alternatively, variant AHASL1 nucleotide sequences can be made by introducing mutations randomly along all or part of an AHASL 1 coding sequence, such as by saturation mutagenesis, and the resultant mutants can be screened for AHAS activity to identify mutants that retain AHAS activity, including herbicide-resistant AHAS activity. 26 Following mutagenesis, the encoded protein can be expressed recombinantly, and the activity of the protein can be determined using standard assay techniques. [00901 Thus, the nucleotide sequences of the invention include the sequences disclosed herein as well as fragments and variants thereof. The AHASLI nucleotide sequences of the invention, and fragments and variants thereof, can be used as probes and/or primers to identify and/or clone AHASL homologues in other plants. Such probes can be used to detect transcripts or genomic sequences encoding the same or identical proteins. 100911 In this manner, methods such as PCR, hybridization, and the like can be used to identify such sequences having substantial identity to the sequences of the invention. See, for example, Sambrook et al. (1989) Molecular Cloning: Laboratory Manual (2d ed., Cold Spring Harbor Laboratory Press, Plainview, NY) and Innis, et al. (1990) PCR Protocols: A Guide to Methods and Applications (Academic Press, NY). AHASL nucleotide sequences isolated based on their sequence identity to the AHASLI nucleotide sequences set forth herein or to fragments and variants thereof are encompassed by the present invention. [0092] In a hybridization method, all or part of a known AHASL I nucleotide sequence can be used to screen cDNA or genomic libraries. Methods for construction of such cDNA and genomic libraries are generally known in the art and are disclosed in Sambrook et al. (1989) Molecular Cloning: A Laboratory Manual (2d ed., Cold Spring Harbor Laboratory Press, Plainview, NY). The so-called hybridization probes may be genomic DNA fragments, cDNA fragments, RNA fragments, or other oligonucleotides, and may be labeled with a detectable group such as 32 P, or any other detectable marker, such as other radioisotopes, a fluorescent compound, an enzyme, or an enzyme co-factor. Probes for hybridization can be made by labeling synthetic oligonucleotides based on the known AHASL1 nucleotide sequence disclosed herein. Degenerate primers designed on the basis of conserved nucleotides or amino acid residues in a known AHASL 1 nucleotide sequence or encoded amino acid sequence can additionally be used. The probe typically comprises a region of nucleotide sequence that hybridizes under stringent conditions to at least about 12, preferably about 25, more preferably about 50, 75, 100, 125, 150, 175, 200, 250, 300, 350, 400, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, or 1800 consecutive 27 nucleotides of an AHASL1 nucleotide sequence of the invention or a fragment or variant thereof. Preparation of probes for hybridization is generally known in the art and is disclosed in Sambrook et al. (1989) Molecular Cloning: A Laboratory Manual (2d ed., Cold Spring Harbor Laboratory Press, Plainview, New York), herein incorporated by reference. [0093] For example, the entire AHASL1 sequence disclosed herein, or one or more portions thereof, may be used as a probe capable of specifically hybridizing to corresponding AHASLI sequences and messenger RNAs. Hybridization techniques include hybridization screening of plated DNA libraries (either plaques or colonies; see, for example, Sambrook et al. (1989) Molecular Cloning: A Laboratory Manual (2d ed., Cold Spring Harbor Laboratory Press, Plainview, New York). [00941 Hybridization of such sequences may be carried out under stringent conditions. By "stringent conditions" or "stringent hybridization conditions" is intended conditions under which a probe will hybridize to its target sequence to a detectably greater degree than to other sequences (e.g., at least 2-fold over background). Stringent conditions are sequence-dependent and will be different in different circumstances. [0095] Typically, stringent conditions will be those in which the salt concentration is less than about 1.5 M Na ion, typically about 0.01 to 1.0 M Na ion concentration (or other salts) at pH 7.0 to 8.3 and the temperature is at least about 30'C for short probes (e.g., 10 to 50 nucleotides) and at least about 60"C for long probes (e.g., greater than 50 nucleotides). Stringent conditions may also be achieved with the addition of destabilizing agents such as formamide. Exemplary low stringency conditions include hybridization with a buffer solution of 30 to 35% formamide, 1 M NaCl, 1% SDS (sodium dodecyl sulphate) at 37 0 C, and a wash in IX to 2X SSC (20X SSC = 3.0 M NaCl/0.3 M trisodium citrate) at 50 to 55 0 C. Exemplary moderate stringency conditions include hybridization in 40 to 45% formamide, 1.0 M NaCl, 1% SDS at 37"C, and a wash in 0.5X to 1X SSC at 55 to 60*C. Exemplary high stringency conditions include hybridization in 50% formamide, 1 M NaCl, 1% SDS at 37*C, and a wash in 0. 1X SSC at 60 to 65 0 C. Optionally, wash buffers may comprise about 0.1% to about 1% SDS. The duration of hybridization is generally less than about 24 hours, usually about 4 to about 12 hours. 28 100961 Specificity is typically the function of post-hybridization washes, the critical factors being the ionic strength and temperature of the final wash solution. For DNA DNA hybrids, the Tm can be approximated from the equation of Meinkoth and Wahl (1984) Anal, Biochem. 138:267-284: Tm = 81.5 0 C + 16.6 (log M) + 0.41 (%GC) - 0.61 (% form) - 500/L; where M is the molarity of monovalent cations, %GC is the percentage of guanosine and cytosine nucleotides in the DNA, % form is the percentage of formamide in the hybridization solution, and L is the length of the hybrid in base pairs. The Tm is the temperature (under defined ionic strength and pH) at which 50% of a complementary target sequence hybridizes to a perfectly matched probe. Tm is reduced by about 1 C for each 1% of mismatching; thus, Tm, hybridization, and/or wash conditions can be adjusted to hybridize to sequences of the desired identity. For example, if sequences with >90% identity are sought, the Tm can be decreased 10 C. Generally, stringent conditions are selected to be about 5 0 C lower than the thermal melting point (Tm) for the specific sequence and its complement at a defined ionic strength and pH. However, severely stringent conditions can utilize a hybridization and/or wash at 1, 2, 3, or 4C lower than the thermal melting point (Tm); moderately stringent conditions can utilize a hybridization and/or wash at 6, 7, 8, 9, or 10"C lower than the thermal melting point (Tm); low stringency conditions can utilize a hybridization and/or wash at 11, 12, 13, 14, 15, or 20'C lower than the thermal melting point (Tm). Using the equation, hybridization and wash compositions, and desired Tm, those of ordinary skill will understand that variations in the stringency of hybridization and/or wash solutions are inherently described. If the desired degree of mismatching results in a Tm of less than 45 0 C (aqueous solution) or 32 0 C (formamide solution), it is preferred to increase the SSC concentration so that a higher temperature can be used. An extensive guide to the hybridization of nucleic acids is found in Tij ssen (1993) Laboratory Techniques in Biochemistry and Molecular Biology Hybridization with Nucleic Acid Probes, Part I, Chapter 2 (Elsevier, New York); and Ausubel et al., eds. (1995) Current Protocols in Molecular Biology, Chapter 2 (Greene Publishing and Wiley-Interscience, New York). See Sambrook et al. (1989) Molecular Cloning: A Laboratory Manual (2d ed., Cold Spring Harbor Laboratory Press, Plainview, New York). 29 [00971 It is recognized that the polynucleotide molecules and proteins of the invention encompass polynucleotide molecules and proteins comprising a nucleotide or an amino acid sequence that is sufficiently identical to the nucleotide sequence of SEQ ID NOS: 1, 3, 5, and/or 7, or to the amino acid sequence of SEQ ID NOS: 2, 4, 5, and/or 8. The term "sufficiently identical" is used herein to refer to a first amino acid or nucleotide sequence that contains a sufficient or minimum number of identical or equivalent (e.g., with a similar side chain) amino acid residues or nucleotides to a second amino acid or nucleotide sequence such that the first and second amino acid or nucleotide sequences have a common structural domain and/or common functional activity. For example, amino acid or nucleotide sequences that contain a common structural domain having at least about 45%, 55%, or 65% identity, preferably 75% identity, more preferably 85%, 95%, or 98% identity are defined herein as sufficiently identical. [00981 To determine the percent identity of two amino acid sequences or of two nucleic acids, the sequences are aligned for optimal comparison purposes. The percent identity between the two sequences is a function of the number of identical positions shared by the sequences (i.e., percent identity = number of identical positions/total number of positions (e.g., overlapping positions) x 100). In one embodiment, the two sequences are the same length. The percent identity between two sequences can be determined using techniques similar to those described below, with or without allowing gaps. In calculating percent identity, typically exact matches are counted. [0099] The determination of percent identity between two sequences can be accomplished using a mathematical algorithm. A preferred, nonlimiting example of a mathematical algorithm utilized for the comparison of two sequences is the algorithm of Karlin and Altschul (1990) Proc. Nat. A cad. Sci. USA 87:2264, modified as in Karlin and Altschul (1993) Proc. NaL. Acad. Sci. USA 90:5873-5877. Such an algorithm is incorporated into the NBLAST and XBLAST programs of Altschul et al. (1990) J Mol. Biol. 215:403. BLAST nucleotide searches can be performed with the NBLAST program, score = 100, wordlength = 12, to obtain nucleotide sequences homologous to the polynucleotide molecules of the invention. BLAST protein searches can be performed with the XBLAST program, score = 50, wordlength = 3, to obtain amino acid sequences homologous to protein molecules of the invention. To obtain gapped alignments for 30 comparison purposes, Gapped BLAST can be utilized as described in Altschul et al. (1997) Nucleic Acids Res. 25:3389. Alternatively, PSI-Blast can be used to perform an iterated search that detects distant relationships between molecules. See Altschul et al. (1997) supra. When utilizing BLAST, Gapped BLAST, and PSI-Blast programs, the default parameters of the respective programs (e.g., XBLAST and NBLAST) can be used. See http://www.ncbi.nlm.nih.gov. Another preferred, non-limiting example of a mathematical algorithm utilized for the comparison of sequences is the algorithm of Myers and Miller (1988) CABIOS 4:11-17. Such an algorithm is incorporated into the ALIGN program (version 2.0), which is part of the GCG sequence alignment software package. When utilizing the ALIGN program for comparing amino acid sequences, a PAM120 weight residue table, a gap length penalty of 12, and a gap penalty of 4 can be used. Alignment may also be performed manually by inspection. [00100J Unless otherwise stated, sequence identity/similarity values provided herein refer to the value obtained using the full-length sequences of the invention and using multiple alignment by mean of the algorithm Clustal W (Nucleic Acid Research, 22(22):4673-4680, 1994) using the program AlignX included in the software package Vector NTI Suite Version 7 (InforMax, Inc., Bethesda, MD, USA) using the default parameters; or any equivalent program thereof. By "equivalent program" is intended any sequence comparison program that, for any two sequences in question, generates an alignment having identical nucleotide or amino acid residue matches and an identical percent sequence identity when compared to the corresponding alignment generated by AlignX in the software package Vector NTI Suite Version 7. [001011 The AHASLI nucleotide sequences of the invention include both the naturally occurring sequences as well as mutant forms, particularly mutant forms that encode AHASLl proteins comprising herbicide-resistant AHAS activity. Likewise, the proteins of the invention encompass both naturally occurring proteins as well as variations and modified forms thereof. Such variants will continue to possess the desired AHAS activity. Obviously, the mutations that will be made in the DNA encoding the Variant must not place the sequence out of reading frame and preferably will not create complementary regions that could produce secondary mRNA structure. See, EP Patent Application Publication No. 75,444. 31 [00102J The deletions, insertions, and substitutions of the protein sequences encompassed herein are not expected to produce radical changes in the characteristics of the protein. However, when it is difficult to predict the exact effect of the substitution, deletion, or insertion in advance of doing so, one skilled in the art will appreciate that the effect will be evaluated by routine screening assays. That is, the activity can be evaluated by AHAS activity assays. See, for example, Singh et al. (1988) Anal. Biochem. 171:173 179, herein incorporated by reference. 1001031 Variant nucleotide sequences and proteins also encompass sequences and proteins derived from a mutagenic and recombinogenic procedure such as DNA shuffling. With such a procedure, one or more different AHASL coding sequences can be manipulated to create a new AHASL protein possessing the desired properties. In this manner, libraries of recombinant polynucleotides are generated from a population of related sequence polynucleotides comprising sequence regions that have substantial sequence identity and can be homologously recombined in vitro or in vivo. For example, using this approach, sequence motifs encoding a domain of interest may be shuffled between the AHASL 1 gene of the invention and other known AHASL genes to obtain a new gene coding for a protein with an improved property of interest, such as an increased Km in the case of an enzyme. Strategies for such DNA shuffling are known in the art. See, for example, Stemmer (1994) Proc. Natl. Acad. Sci. USA 91:10747-10751; Stemmer (1994) Nature 370:389-391; Crameri et al. (1997) Nature Biotech. 15:436-438; Moore et al. (1997) J. Mol. BioL 272:336-347; Zhang et al. (1997) Proc. Natl. Acad. Sci. USA 94:4504-4509; Crameri et al. (1998) Nature 391:288-291; and U.S. Patent Nos. 5,605,793 and 5,837,458. 100104] The nucleotide sequences of the invention can be used to isolate corresponding sequences from other organisms, particularly other plants, more particularly other dicots. In this manner, methods such as PCR, hybridization, and the like can be used to identify such sequences based on their sequence homology to the sequences set forth herein. Sequences isolated based on their sequence identity to the entire AHASLI sequences set forth herein or to fragments thereof are encompassed by the present invention. Thus, isolated sequences that encode for an AHASL protein and which hybridize under stringent 32 conditions to the sequence disclosed herein, or to fragments thereof, are encompassed by the present invention. [00105] In a PCR approach, oligonucleotide primers can be designed for use in PCR reactions to amplify corresponding DNA sequences from cDNA or genomic DNA extracted from any plant of interest. Methods for designing PCR primers and PCR cloning are generally known in the art and are disclosed in Sambrook et al. (1989) Molecular Cloning: A Laboratory Manual (2d ed., Cold Spring Harbor Laboratory Press, Plainview, New York). See also Innis et al., eds. (1990) PCR Protocols: A Guide to Methods and Applications (Academic Press, New York); Innis and Gelfand, eds. (1995) PCR Strategies (Academic Press, New York); and Innis and Gelfand, eds. (1999) PCR Methods Manual (Academic Press, New York). Known methods of PCR include, but are not limited to, methods using paired primers, nested primers, single specific primers, degenerate primers, gene-specific primers, vector-specific primers, partially-mismatched primers, and the like. [001061 The AHASLI polynucleotide sequences of the invention are provided in expression cassettes for expression in the plant of interest. The cassette will include 5' and 3' regulatory sequences operably linked to an AHASL1 polynucleotide sequence of the invention. By "operably linked" is intended a functional linkage between a promoter and a second sequence, wherein the promoter sequence initiates and mediates transcription of the DNA sequence corresponding to the second sequence. Generally, operably linked means that the nucleic acid sequences being linked are contiguous and, where necessary to join two protein coding regions, contiguous and in the same reading frame. The cassette may additionally contain at least one additional gene to be cotransformed into the organism. Alternatively, the additional gene(s) can be provided on multiple expression cassettes. [00107] Such an expression cassette is provided with a plurality of restriction sites for insertion of the AHASL1 polynucleotide sequence to be under the transcriptional regulation of the regulatory regions. The expression cassette may additionally contain selectable marker genes. [00108] The expression cassette will include in the 5'-3' direction of transcription, a transcriptional and translational initiation region (i.e., a promoter), an AHASL 1 33 polynucleotide sequence of the invention, and a transcriptional and translational termination region (i.e., termination region) functional in plants. The promoter may be native or analogous, or foreign or heterologous, to the plant host and/or to the AHASLI polynucleotide sequence of the invention. Additionally, the promoter may be the natural sequence or alternatively a synthetic sequence. Where the promoter is "foreign" or "heterologous" to the plant host, it is intended that the promoter is not found in the native plant into which the promoter is introduced. Where the promoter is "foreign" or "heterologous" to the AHASL1 polynucleotide sequence of the invention, it is intended that the promoter is not the native or naturally occurring promoter for the operably linked AHASL1 polynucleotide sequence of the invention, As used herein, a chimeric gene comprises a coding sequence operably linked to a transcription initiation region that is heterologous to the coding sequence. [001091 While it may be preferable to express the AHASL1 polynucleotides of the invention using heterologous promoters, the native promoter sequences may be used. Such constructs would change expression levels of the AHASL1 protein in the plant or plant cell. Thus, the phenotype of the plant or plant cell is altered. [00110] The termination region may be native with the transcriptional initiation region, may be native with the operably linked AHASL I sequence of interest, may be native with the plant host, or may be derived from another source (i.e., foreign or heterologous to the promoter, the AHASL 1 polynucleotide sequence of interest, the plant host, or any combination thereof). Convenient termination regions are available from the Ti-plasmid of A. tumefaciens, such as the octopine synthase and nopaline synthase termination regions. See also Guerineau et at. (1991) Mol. Gen. Genet. 262:141-144; Proudfoot (1991) Cell 64:671-674; Sanfacon et al (1991) Genes Dev. 5:141-149; Mogen et al (1990) Plant Cell 2:1261-1272; Munroe et al. (1990) Gene 91:151-158; Ballas et al. (1989) Nucleic Acids Res. 17:7891-7903; and Joshi et al. (1987) Nucleic Acid Res. 15:9627-9639. [00111] Where appropriate, the gene(s) may be optimized for increased expression in the transformed plant. That is, the genes can be synthesized using plant-preferred codons for improved expression. See, for example, Campbell and Gowri (1990) Plant Physiol. 92:1-11 for a discussion of host-preferred codon usage. Methods are available in the art 34 for synthesizing plant-preferred genes. See, for example, U.S. Patent Nos. 5,380,831, and 5,436,391, and Murray et al. (1989) Nucleic Acids Res. 17:477-498, herein incorporated by reference. [001121 Additional sequence modifications are known to enhance gene expression in a cellular host. These include elimination of sequences encoding spurious polyadenylation signals, exon-intron splice site signals, transposon-like repeats, and other such well characterized sequences that may be deleterious to gene expression. The G-C content of the sequence may be adjusted to levels average for a given cellular host, as calculated by reference to known genes expressed in the host cell. When possible, the sequence is modified to avoid predicted hairpin secondary mRNA structures. [00113] Nucleotide sequences for enhancing gene expression can also be used in the plant expression vectors. These include the introns of the maize Adhl, intronl gene (Callis et al. Genes and Development 1:1183-1200, 1987), and leader sequences, (W-sequence) from the Tobacco Mosaic virus (TMV), Maize Chlorotic Mottle Virus and Alfalfa Mosaic Virus (Gallie et al, Nucleic Acid Res. 15:8693-8711, 1987 and Skuzeski et al. Plant Mol. Biol. 15:65-79, 1990). The first intron from the shrunkent-1 locus of maize, has been shown to increase expression of genes in chimeric gene constructs. U.S. Pat. Nos. 5,424,412 and 5,593,874 disclose the use of specific introns in gene expression constructs, and Gallie et al. (Plant PhysiotL 106:929-939, 1994) also have shown that introns are useful for regulating gene expression on a tissue specific basis. To further enhance or to optimize AHAS small subunit gene expression, the plant expression vectors of the invention may also contain DNA sequences containing matrix attachment regions (MARs). Plant cells transformed with such modified expression systems, then, may exhibit overexpression or constitutive expression of a nucleotide sequence of the invention. [00114] The expression cassettes may additionally contain 5' leader sequences in the expression cassette construct. Such leader sequences can act to enhance translation. Translation leaders are known in the art and include: picornavirus leaders, for example, EMCV leader (Encephalomyocarditis 5' noncoding region) (Elroy-Stein et al. (1989) Proc. Natl. Acad. Sci. USA 86:6126-6130); potyvirus leaders, for example, TEV leader (Tobacco Etch Virus) (Gallie et al (1995) Gene 165(2):233-238), MDMV leader (Maize 35 Dwarf Mosaic Virus) (Virology 154:9-20), and human immunoglobulin heavy-chain binding protein (BiP) (Macejak et al. (1991) Nature 353:90-94); untranslated leader from the coat protein mRNA of alfalfa mosaic virus (AMV RNA 4) (Jobling et al. (1987) Nature 325:622-625); tobacco mosaic virus leader (TMV) (Gallie et al (1989) in Molecular Biology ofRNA, ed. Cech (Liss, New York), pp. 237-256); and maize chlorotic mottle virus leader (MCMV) (Lommel et al. (1991) Virology 81:382-385). See also, Della-Cioppa et al. (1987) Plant Physiol. 84:965-968. Other methods known to enhance translation can also be utilized, for example, introns, and the like. [001151 In preparing the expression cassette, the various DNA fragments may be manipulated, so as to provide for the DNA sequences in the proper orientation and, as appropriate, in the proper reading frame. Toward this end, adapters or linkers may be employed to join the DNA fragments or other manipulations may be involved to provide for convenient restriction sites, removal of superfluous DNA, removal of restriction sites, or the like. For this purpose, in vitro mutagenesis, primer repair, restriction, annealing, resubstitutions, e.g., transitions and transversions, maybe involved. [001161 A number of promoters can be used in the practice of the invention. The promoters can be selected based on the desired outcome. The nucleic acids can be combined with constitutive, tissue-preferred, or other promoters for expression in plants. [001171 Such constitutive promoters include, for example, the core promoter of the Rsyn7 promoter and other constitutive promoters disclosed in WO 99/4383 8 and U.S. Patent No. 6,072,050; the core CaMV 35S promoter (Odell et al. (1985) Nature 313:810 812); rice actin (McElroy et al. (1990) Plant Cell 2:163-171); ubiquitin (Christensen et al. (1989) Plant Mol. Biol 12:619-632 and Christensen et al. (1992) Plant Mol. Biol. 18:675 689); pEMU (Last et al. (1991) Theor. AppL Genet. 81:581-588); MAS (Velten et al (1984) EMBO J. 3:2723-2730); ALS promoter (U.S. Patent No. 5,659,026), and the like. Other constitutive promoters include, for example, U.S. Patent Nos. 5,608,149; 5,608,144; 5,604,121; 5,569,597; 5,466,785; 5,399,680; 5,268,463; 5,608,142; and 6,177,611. [001181 Tissue-preferred promoters can be utilized to target enhanced AHASLI expression within a particular plant tissue, Such tissue-preferred promoters include, but are not limited to, leaf-preferred promoters, root-preferred promoters, seed-preferred promoters, and stem-preferred promoters. Tissue-preferred promoters include Yamamoto 36 et al. (1997) Plant J. 12(2):255-265; Kawamata etal. (1997) Plant Cell Physiol. 38(7):792-803; Hansen et al. (1997) Mol, Gen Genet. 254(3):337-343; Russell et al. (1997) Transgenic Res. 6(2):157-168; Rinehart et al. (1996) Plant Physiol. 112(3):1331 1341; Van Camp et al (1996) Plant Physiol. 112(2):525-535; Canevascini et al. (1996) Plant Physiol. 112(2):513-524; Yamamoto et al. (1994) Plant Cell Physiol. 35(5):773 778; Lam (1994) Results Probl. CeIlDiffer. 20:181-196; Orozco et al, (1993) Plant Mol Biol. 23(6):1129-1138; Matsuoka et al. (1993) Proc Natl. A cad. Sci. USA 90(20):9586 9590; and Guevara-Garcia et al. (1993) Plant J 4(3):495-505. Such promoters can be modified, if necessary, for weak expression. [001191 In one embodiment, the nucleic acids of interest are targeted to the chloroplast for expression. In this manner, where the nucleic acid of interest is not directly inserted into the chloroplast, the expression cassette will additionally contain a chloroplast targeting sequence comprising a nucleotide sequence that encodes a chloroplast transit peptide to direct the gene product of interest to the chloroplasts. Such transit peptides are known in the art. With respect to chloroplast-targeting sequences, "operably linked" means that the nucleic acid sequence encoding a transit peptide (i.e., the chloroplast targeting sequence) is linked to the AHASL polynucleotide of the invention such that the two sequences are contiguous and in the same reading frame. See, for example, Von Heijne et al. (199 1) Plant Mol. Biol. Rep. 9:104-126; Clark et al. (1989) JR iol. Chem. 264:17544-17550; Della-Cioppa et al. (1987) Plant Physiol. 84:965-968; Romer et al. (1993) Biochem. Biophys. Res. Commun. 196:1414-1421; and Shah et al. (1986) Science 233:478-481. While the AHASL1 proteins of the invention include a native chloroplast transit peptide, any chloroplast transit peptide known in art can be fused to the amino acid sequence of a mature AHASLI protein of the invention by operably linking a choloroplast-targeting sequence to the 5'-end of a nucleotide sequence encoding a mature AHASL I protein of the invention. [00120] Chloroplast targeting sequences are known in the art and include the chloroplast small subunit of ribulose-1,5-bisphosphate carboxylase (Rubisco) (de Castro Silva Filho et al. (1996) Plant Mol. Biol. 30:769-780; Schnell et al. (1991) J Biol. Chem. 266(5):3335-3342); 5-(enolpyruvy1)shikimate-3 -phosphate synthase (EPSPS) (Archer et al. (1990) 1 Bioenerg. Biomemb. 22(6):789-8 10); tryptophan synthase (Zhao et al. (1995) 37 J. Biol. Chem. 270(11):6081-6087); plastocyanin (Lawrence et at. (1997)J Biol. Chem. 272(33):20357-20363); chorismate synthase (Schmidt et al. (1993) . Biol. Chem. 268(36):27447-27457); and the light harvesting chlorophyll a/b binding protein (LHBP) (Lamppa et al. (1988) J Biol. Chem. 263:14996-14999). See also Von Heijne et al. (1991) Plant Mal Biol. Rep. 9:104-126; Clark et al. (1989) J Biol. Chem. 264:17544 17550; Della-Cioppa et al. (1987) Plant Physiol. 84:965-968; Romer et al. (1993) Biochem. Biophys. Res. Commun. 196:1414-1421; and Shah et al. (1986) Science 233:478-481. [00121] Methods for transformation of chloroplasts are known in the art, See, for example, Svab et al. (1990) Proc. Nati. Acad. Sci. USA 87:8526-8530; Svab and Maliga (1993) Proc. Natl. Acad. Sci. USA 90:913-917; Svab and Maliga (1993) EMBO J 12:601 606. The method relies on particle gun delivery of DNA containing a selectable marker and targeting of the DNA to the plastid genome through homologous recombination. Additionally, plastid transformation can be accomplished by transactivation of a silent plastid-borne transgene by tissue-preferred expression of a nuclear-encoded and plastid directed RNA polymerase. Such a system has been reported in McBride et al. (1994) Proc. Nati. Acad. Sci. USA 91:7301-7305. [001221 The nucleic acids of interest to be targeted to the chloroplast may be optimized for expression in the chloroplast to account for differences in codon usage between the plant nucleus and this organelle. In this manner, the nucleic acids of interest may be synthesized using chloroplast-preferred codons. See, for example, U.S. Patent No. 5,380,831, herein incorporated by reference, 100123] As disclosed herein, the AHASL1 nucleotide sequences of the invention find use in enhancing the herbicide tolerance of plants that comprise in their genomes a gene encoding a herbicide-tolerant AHASL1 protein. Such a gene may be an endogenous gene or a transgene. Additionally, in certain embodiments, the nucleic acid sequences of the present invention can be stacked with any combination of polynucleotide sequences of interest in order to create plants with a desired phenotype. For example, the polynucleotides of the present invention may be stacked with any other polynucleotides encoding polypeptides having pesticidal and/or insecticidal activity, such as, for example, the Bacillus thuringiensis toxin proteins (described in U.S. Patent Nos. 5,366,892; 38 5,747,450; 5,737,514; 5,723,756; 5,593,881; and Geiser et al. (1986) Gene 48:109). The combinations generated can also include multiple copies of any one of the polynucleotides of interest. [00124] It is recognized that with these nucleotide sequences, antisense constructions, complementary to at least a portion of the messenger RNA (mRNA) for the AHASLI polynucleotide sequences can be constructed. Antisense nucleotides are constructed to hybridize with the corresponding mRNA. Modifications of the antisense sequences may be made as long as the sequences hybridize to and interfere with expression of the corresponding mRNA. In this manner, antisense constructions having 70%, preferably 80%, more preferably 85% sequence identity to the corresponding antisensed sequences may be used. Furthermore, portions of the antisense nucleotides may be used to disrupt the expression of the target gene. Generally, sequences of at least 50 nucleotides, 100 nucleotides, 200 nucleotides, or greater may be used. [001251 The nucleotide sequences of the present invention may also be used in the sense orientation to suppress the expression of endogenous genes in plants. Methods for suppressing gene expression in plants using nucleotide sequences in the sense orientation are known in the art. The methods generally involve transforming plants with a DNA construct comprising a promoter that drives expression in a plant operably linked to at least a portion of a nucleotide sequence that corresponds to the transcript of the endogenous gene. Typically, such a nucleotide sequence has substantial sequence identity to the sequence of the transcript of the endogenous gene, preferably greater than about 65% sequence identity, more preferably greater than about 85% sequence identity, most preferably greater than about 95% sequence identity. See, U.S. Patent Nos. 5,283,184 and 5,034,323; herein incorporated by reference. 1001261 While the herbicide-resistant AHASLI polynucleotides of the invention find use as selectable marker genes for plant transformation, the expression cassettes of the invention can include another selectable marker gene for the selection of transformed cells. Selectable marker genes, including those of the present invention, are utilized for the selection of transformed cells or tissues. Marker genes include, but are not limited to, genes encoding antibiotic resistance, such as those encoding neomycin phosphotransferase II (NEO) and hygromycin phosphotransferase (HPT), as well as genes conferring resistance to herbicidal 39 compounds, such as glufosinate ammonium, bromoxynil, imidazolinones, and 2,4 dichlorophenoxyacetate (2,4-D). See generally, Yarranton (1992) Curr. Opin, Biotech. 3:506-511; Christopherson et aL (1992) Proc. Nat Acad Sci. USA 89:6314-6318; Yao et al (1992) Cell 71:63-72; Reznikoff (1992) Mol MicrobioL 6:2419-2422; Barkley et al. (1980) in The Operon, pp. 177-220; Hu et aL (1987) Cell 48:555-566; Brown et al. (1987) Cell 49:603-612; Figge et aL (1988) Cell 52:713-722; Deuschle et at (1989) Proc. Natt Acad Aci. USA 86:5400-5404; Fuerst et al (1989) Proc. Natt Acad Sci. USA 86:2549-2553; Deuschle et al (1990) Science 248:480-483; Gossen (1993) Ph.D. Thesis, University of Heidelberg; Reines et aL (1993) Proc. Natl Acad. Sci. USA 90:1917-1921; Labow et al. (1990) Mol. Cell Biol 10:3343-3356; Zambretti et al (1992) Proc. Natt Acad. Sci. USA 89:3952-3956; Bairn et al (1991) Proc. Nat. Acad Sci. USA 88:5072-5076; Wyborski et al (1991) Nucleic A cids Res. 19:4647-4653; Hillenand-Wissman (1989) Topics Mol Struc. Biol 10:143-162; Degenkolb et al (1991) Antimicrob Agents Chemother. 35:1591-1595; Kleinschnidt et al (1988) Biochemistry 27:1094-1104; Bonin (1993) Ph.D. Thesis, University of Heidelberg; Gossen et al. (1992) Proc. Natl A cad Sci. USA 89:5547-5551; Oliva et aL (1992) Antimicrob, Agents Chemother. 36:913-919; Hlavka et aL (1985) Handbook ofExperimental Pharmacology, Vol. 78 ( Springer-Verlag, Berlin); Gill et aL (1988) Nature 334:721-724. Such disclosures are herein incorporated by reference. 1001271 The above list of selectable marker genes is not meant to be limiting. Any selectable marker gene can be used in the present invention. 100128] The isolated polynucleotide molecules comprising nucleotide sequence that encode the AHASLI proteins of the invention can be used in vectors to transform plants so that the plants created have enhanced resistant to herbicides, particularly imidazolinone herbicides. The isolated AHASLI polynucleotide molecules of the invention can be used in vectors alone or in combination with a nucleotide sequence encoding the small subunit of the AHAS (AHASS) enzyme in conferring herbicide resistance in plants. See, U.S. Patent No. 6,348,643; which is herein incorporated by reference. [001291 The invention also relates to a plant expression vector comprising a promoter that drives expression in a plant operably linked to an isolated polynucleotide molecule of the invention. The isolated polynucleotide molecule comprises a nucleotide sequence encoding an AHASLI protein, particularly an AHASLI protein comprising an amino 40 sequence that is set forth in SEQ ID NO: 2, 4, 6, or 8, or a functional fragment and variant thereof. The plant expression vector of the invention does not depend on a particular promoter, only that such a promoter is capable of driving gene expression in a plant cell. Preferred promoters include constitutive promoters and tissue-preferred promoters. [00130] The transformation vectors of the invention can be used to produce plants transformed with a gene of interest, The transformation vector will comprise a selectable marker gene of the invention and a gene of interest to be introduced and typically expressed in the transformed plant. Such a selectable marker gene comprises a herbicide resistant AHASL1 polynucleotide of the invention operably linked to a promoter that drives expression in a host cell. For use in plants and plant cells, the transformation vector comprises a selectable marker gene comprising a herbicide-resistant AHASL1 polynucleotide of the invention operably linked to a promoter that drives expression in a plant cell. [00131] The genes of interest of the invention vary depending on the desired outcome. For example, various changes in phenotype can be of interest including modifying the fatty acid composition in a plant, altering the amino acid content of a plant, altering a plant's insect and/or pathogen defense mechanisms, and the like. These results can be achieved by providing expression of heterologous products or increased expression of endogenous products in plants. Alternatively, the results can be achieved by providing for a reduction of expression of one or more endogenous products, particularly enzymes or cofactors in the plant. These changes result in a change in phenotype of the transformed plant. [00132] In one embodiment of the invention, the genes of interest include insect resistance genes such as, for example, Bacillus thuringiensis toxin protein genes (U.S. Patent Nos. 5,366,892; 5,747,450; 5,736,514; 5,723,756; 5,593,881; and Geiser et al. (1986) Gene 48:109). 1001331 The AHASLI proteins or polypeptides of the invention can be purified from, for example, sunflower plants and can be used in compositions. Also, an isolated polynucleotide molecule encoding an AHASL 1 protein of the invention can be used to express an AHASLI protein of the invention in a microbe such as E. coli or a yeast The 41 expressed AHASL1 protein can be purified from extracts of E. coli or yeast by any method known to those or ordinary skill in the art. [001341 The invention also relates to a method for creating a transgenic plant that is resistant to herbicides, comprising transforming a plant with a plant expression vector comprising a promoter that drives expression in a plant operably linked to an isolated polynucleotide molecule of the invention. The isolated polynucleotide molecule comprises a nucleotide sequence encoding an AHASLI protein of the invention, particularly an AHASLI protein comprising: an amino sequence that is set forth in SEQ ID NO: 2 or 6, an amino acid sequence encoded by SEQ ID NO: 1 or 5, or a functional fragment and variant of said amino acid sequences. [00135] The invention also relates to the non-transgenic sunflower plants, transgenic plants produced by the methods of the invention, and progeny and other descendants of such non-transgenic and transgenic plants, which plants exhibit enhanced or increased resistance to herbicides that interfere with the AHAS enzyme, particularly imidazolinone and sulfonylurea herbicides. [00136] The AHASL1 polynucleotides of the invention, particularly those encoding herbicide-resistant AHASLl proteins, find use in methods for enhancing the resistance of herbicide-tolerant plants. In one embodiment of the invention, the herbicide-tolerant plants comprise a herbicide-tolerant or herbicide resistant AHASL protein. The herbicide tolerant plants include both plants transformed with a herbicide-tolerant AHASL nucleotide sequences and plants that comprise in their genomes an endogenous gene that encodes a herbicide-tolerant AHASL protein. Nucleotide sequences encoding herbicide tolerant AHASL proteins and herbicide-tolerant plants comprising an endogenous gene that encodes a herbicide-tolerant AHASL protein include the polynucleotides and plants of the present invention and those that are known in the art. See, for example, U.S. Patent Nos. 5,013,659, 5,731,180, 5,767,361, 5,545,822, 5,736,629, 5,773,703, 5,773,704, 5,952,553 and 6,274,796; all of which are herein incorporated by reference, Such methods for enhancing the resistance of herbicide-tolerant plants comprise transforming a herbicide-tolerant plant with at least one polynucleotide construction comprising a promoter that drives expression in a plant cell that is operably linked to a herbicide resistant AHASL 1 polynucleotide of the invention, particularly the polynucleotide 42 encoding a herbicide-resistant AHASL 1 protein set forth in SEQ ID NO: I or 5, polynucleotides encoding the amino acid sequence set forth in SEQ ID NO: 2 or 6, and fragments and variants said polynucleotides that encode polypeptides comprising herbicide-resistant AHAS activity. [001371 Numerous plant transformation vectors and methods for transforming plants are available. See, for example, An, G. et al. (1986) Plant Pysiol., 81:301-305; Fry, J., et al. (1987) Plant Cell Rep. 6:321-325; Block, M. (1988) Theor. Apple Genet.76:767-774; Hinchee, et al. (1990) Stadler. Genet. Symp.203212.203-212; Cousins, et al. (1991) Aust. J1 Plant Physiol. 18:481-494; Chee, P. P. and Slightom, J. L. (1992) Gene.118:255-260; Christou, et al. (1992) Trends. Biotechnol. 10:239-246; D'Halluin, et al. (1992) Bio/Technol. 10:309-314; Dhir, et al. (1992) Plant Physiol. 99:81-88; Casas et al. (1993) Proc. Nat. A cad Sci. USA 90:11212-11216; Christou, P. (1993) In Vitro Cell. Dev. Biol.
Plant; 29P:119-124; Davies, et al. (1993) Plant Cell Rep. 12:180-183; Dong, J. A. and Mchughen, A. (1993) Plant Sci. 91:139-148; Franklin, C. I. and Trieu, T. N. (1993) Plant. Physiol. 102:167; Golovkin, et al. (1993) Plant Sci. 90:41-52; Guo Chin Sci. Bull. 38:2072-2078; Asano, et al. (1994) Plant Cell Rep. 13; Ayeres N. M. and Park, W. D. (1994) Crit. Rev. Plant. Sci. 13:219-239; Barcelo, et al. (1994) Plant. 1 5:583-592; Becker, et al. (1994) Plant. J 5:299-307; Borkowska et al. (1994) Acta. Physiol Plant. 16:225-230; Christou, P. (1994) Agro. Food. Ind. Hi Tech. 5: 17-27; Eapen et al. (1994) Plant Cell Rep. 13:582-586; Hartman, et al. (1994) Bio-Technology 12: 919923; Ritala, et al. (1994) Plant Mol. Biol. 24:317-325; and Wan, Y. C. and Lemaux, P. G. (1994) Plant Physiol. 104:3748. 1001381 The methods of the invention involve introducing a polynucleotide construct into a plant. By "introducing" is intended presenting to the plant the polynucleotide construct in such a manner that the construct gains access to the interior of a cell of the plant. The methods of the invention do not depend on a particular method for introducing a polynucleotide construct to a plant, only that the polynucleotide construct gains access to the interior of at least one cell of the plant. Methods for introducing polynucleotide constructs into plants are known in the art including, but not limited to, stable transformation methods, transient transformation methods, and virus-mediated methods. 43 [001391 By "stable transformation" is intended that the polynucleotide construct introduced into a plant integrates into the genome of the plant and is capable of being inherited by progeny thereof. By "transient transformation" is intended that a polynucleotide construct introduced into a plant does not integrate into the genome of the plant. 1001401 For the transformation of plants and plant cells, the nucleotide sequences of the invention are inserted using standard techniques into any vector known in the art that is suitable for expression of the nucleotide sequences in a plant or plant cell. The selection of the vector depends on the preferred transformation technique and the target plant species to be transformed. In an embodiment of the invention, an AHASL 1 nucleotide sequence is operably linked to a plant promoter that is known for high-level expression in a plant cell, and this construct is then introduced into a plant that that is susceptible to an imidazolinone herbicide and a transformed plant it regenerated. The transformed plant is tolerant to exposure to a level of an imidazolinone herbicide that would kill or significantly injure an untransformed plant. This method can be applied to any plant species; however, it is most beneficial when applied to crop plants, particularly crop plants that are typically grown in the presence of at least one herbicide, particularly an imidazolinone herbicide. [00141] Methodologies for constructing plant expression cassettes and introducing foreign nucleic acids into plants are generally known in the art and have been previously described. For example, foreign DNA can be introduced into plants, using tumor inducing (Ti) plasmid vectors. Other methods utilized for foreign DNA delivery involve the use of PEG mediated protoplast transformation, electroporation, microinjection whiskers, and biolistics or microprojectile bombardment for direct DNA uptake. Such methods are known in the art. (U.S. Pat. No. 5,405,765 to Vasil et al.; Bilang et al. (1991) Gene 100: 247-250; Scheid et al., (1991) Mol. Gen. Genet., 228: 104-112; Guerche et al., (1987) Plant Science 52: 111-116; Neuhause et al., (1987) Theor. Apple Genet. 75: 30-36; Klein et al,, (1987) Nature 327: 70-73; Howell et al., (1980) Science 208:1265; Horsch et al., (1985) Science 227: 1229-1231; DeBlock et al., (1989) Plant Physiology 91: 694-701; Methodsfor Plant Molecular Biology (Weissbach and Weissbach, eds.) Academic Press, Inc. (1988) and Methods in Plant Molecular Biology (Schuler and Zielinski, eds.) 44 Academic Press, Inc. (1989). The method of transformation depends upon the plant cell to be transformed, stability of vectors used, expression level of gene products and other parameters. [001421 Other suitable methods of introducing nucleotide sequences into plant cells and subsequent insertion into the plant genome include microinjection as Crossway et at. (1986) Biotechniques 4:320-334, electroporation as described by Riggs et al. (1986) Proc. NatL A cad. Sci. USA 83:5602-5606, Agrobacterium-mediated transformation as described by Townsend et al., U.S. Patent No. 5,563,055, Zhao et al., U.S. Patent No. 5,981,840, direct gene transfer as described by Paszkowski et al. (1984) EMBO J. 3:2717-2722, and ballistic particle acceleration as described in, for example, Sanford et al., U.S. Patent No. 4,945,050; Tomes et al., U.S. Patent No. 5,879,918; Tomes et al., U.S. Patent No. 5,886,244; Bidney et al., U.S. Patent No. 5,932,782; Tomes et al. (1995) "Direct DNA Transfer into Intact Plant Cells via Microprojectile Bombardment," in Plant Cell, Tissue, and Organ Culture: Fundamental Methods, ed. Gamborg and Phillips (Springer-Verlag, Berlin); McCabe et al. (1988) Biotechnology 6:923-926); and Led1 transformation (WO 00/28058). Also see, Weissinger et al. (1988) Ann. Rev. Genet. 22:421-477; Sanford et al. (1987) Particulate Science and Technology 5:27-37 (onion); Christou et al. (1988) Plant Physiol. 87:671-674 (soybean); McCabe et al. (1988) Bio/Technology 6:923-926 (soybean); Finer and McMullen (1991) In Vitro Cell Dev. Biol. 27P:175-182 (soybean); Singh et al. (1998) Theor. Apple. Genet. 96:319-324 (soybean); Datta et al. (1990) Biotechnology 8:736-740 (rice); Klein et al. (1988) Proc. Natl. Acad. Sci. USA 85:4305-4309 (maize); Klein et al. (1988) Biotechnology 6:559-563 (maize); Tomes, U.S. Patent No. 5,240,855; Buising et al., U.S. Patent Nos. 5,322,783 and 5,324,646; Tomes et al. (1995) 'Direct DNA Transfer into Intact Plant Cells via Microprojectile Bombardment," in Plant Cell, Tissue, and Organ Culture: Fundamental Methods, ed. Gamborg (Springer-Verlag, Berlin) (maize); Klein et al. (1988) Plant Physiol 91:440-444 (maize); Fromm et al. (1990) Biotechnology 8:833-839 (maize); Hooykaas-Van Slogteren et al (1984) Nature (London) 311:763-764; Bowen et al, U.S. Patent No. 5,736,369 (cereals); Bytebier et al. (1987) Proc. Natt A cad. Sci. USA 84:5345-5349 (Liliaceae); De Wet et al. (1985) in The Experimental Manipulation of Ovule Tissues, ed. Chapman et al. (Longman, New York), pp. 197-209 (pollen); Kaeppler et al. (1990) Plant Cell Reports 45 9:415-418 and Kaeppler et al. (1992) Theor. Apple. Genet. 84:560-566 (whisker-mediated transformation); D'Halluin et al. (1992) Plant Cell 4:1495-1505 (electroporation); Li et al (1993) Plant Cell Reports 12:250-255 and Christou and Ford (1995) Annals of Botany 75:407-413 (rice); Osjoda et al. (1996) Nature Biotechnology 14:745-750 (maize via Agrobacterium tumefaciens); all of which are herein incorporated by reference. 1001431 The polynucleotides of the invention may be introduced into plants by contacting plants with a virus or viral nucleic acids. Generally, such methods involve incorporating a polynucleotide construct of the invention within a viral DNA or RNA molecule. It is recognized that the an AHASLI protein of the invention may be initially synthesized as part of a viral polyprotein, which later may be processed by proteolysis in vivo or in vitro to produce the desired recombinant protein. Further, it is recognized that promoters of the invention also encompass promoters utilized for transcription by viral RNA polymerases. Methods for introducing polynucleotide constructs into plants and expressing a protein encoded therein, involving viral DNA or RNA molecules, are known in the art. See, for example, U.S. Patent Nos. 5,889,191, 5,889,190, 5,866,785, 5,589,367 and 5,316,931; herein incorporated by reference. [00144] The cells that have been transformed may be grown into plants in accordance with conventional ways. See, for example, McCormick et aL (1986) Plant Cell Reports 5:81-84. These plants may then be grown, and either pollinated with the same transformed strain or different strains, and the resulting hybrid having constitutive expression of the desired phenotypic characteristic identified. Two or more generations may be grown to ensure that expression of the desired phenotypic characteristic is stably maintained and inherited and then seeds harvested to ensure expression of the desired phenotypic characteristic has been achieved. In this manner, the present invention provides transformed seed (also referred to as "transgenic seed") having a polynucleotide construct of the invention, for example, an expression cassette of the invention, stably incorporated into their genome. [00145] The present invention may be used for transformation of any plant species, including, but not limited to, monocots and dicots. Examples of plant species of interest include, but are not limited to, corn or maize (Zea nays), Brassica sp. (e.g., B. napus, B. rapa, B. juncea), particularly those Brassica species useful as sources of seed oil, alfalfa 46 (Medicago sativa), rice (Oryza sativa), rye (Secale cereale), sorghum (Sorghum bicolor, Sorghum vulgare), millet (e.g., pearl millet (Pennisetum glaucum), proso millet (Panicum miliaceum), foxtail millet (Setaria italica), finger millet (Eleusine coracana)), sunflower (Helianthus annuus), safflower (Carthamus tinctorius), wheat (Triticum aestivum, T. Turgidum ssp, durum), soybean (Glycine max), tobacco (Nicotiana tabacum), potato (Solanum tuberosum), peanuts (Arachis hypogaea), cotton (Gossypium barbadense, Gossypium hirsutum), sweet potato (Ipomoea batatus), cassava (Manihot esculenta), coffee (Coffea spp.), coconut (Cocos nucifera), pineapple (Ananas comosus), citrus trees (Citrus spp.), cocoa (Theobroma cacao), tea (Camellia sinensis), banana (Musa spp.), avocado (Persea americana), fig (Ficus casica), guava (Psidium guajava), mango (Mangifera indica), olive (Olea europaea), papaya (Carica papaya), cashew (Anacardium occidentale), macadamia (Macadamia integrifolia), almond (Prunus amygdalus), sugar beets (Beta vulgaris), sugarcane (Saccharum spp.), oats, barley, vegetables, ornamentals, and conifers. Preferably, plants of the present invention are crop plants (for example, sunflower, Brassica sp., cotton, sugar, beet, soybean, peanut, alfalfa, safflower, tobacco, corn, rice, wheat, rye, barley triticale, sorghum, millet, etc.). [00146] The herbicide resistant plants of the invention find use in methods for controlling weeks. Thus, the present invention further provides a method for controlling weeds in the vicinity of a herbicide-resistant plant of the invention. The method comprises applying an effective amount of a herbicide to the weeds and to the herbicide resistant plant, wherein the plant has increased resistance to at least one herbicide, particularly an imidazolinone or sulfonylurea herbicide, when compared to a wild-type plant. In such a method for controlling weeds, the herbicide-resistant plants of the invention are preferably crop plants, including, but not limited to, sunflower, alfalfa, Brassica sp., soybean, cotton, safflower, peanut, tobacco, tomato, potato, wheat, rice, maize, sorghum, barley, rye, millet, and sorghum. [001471 By providing plants having increased resistance to herbicides, particularly imidazolinone and sulfonylurea herbicides, a wide variety of formulations can be employed for protecting plants from weeds, so as to enhance plant growth and reduce competition for nutrients. A herbicide can be used by itself for pre-emergence, post emergence, pre-planting and at planting control of weeds in areas surrounding the plants 47 described herein or an imidazolinone herbicide formulation can be used that contains other additives. The herbicide can also be used as a seed treatment. Additives found in an imidazolinone or sulfonylurea herbicide formulation include other herbicides, detergents, adjuvants, spreading agents, sticking agents, stabilizing agents, or the like. The herbicide formulation can be a wet or dry preparation and can include, but is not limited to, flowable powders, emulsifiable concentrates and liquid concentrates. The herbicide and herbicide formulations can be applied in accordance with conventional methods, for example, by spraying, irrigation, dusting, or the like. [001481 The present invention provides non-transgenic and transgenic seeds with increased resistance to at least one herbicide, particularly an AHAS-inhibiting herbicide. Such seeds include, for example, non-transgenic sunflower seeds comprising the herbicide-resistance characteristics of the plant with ATCC Patent Deposit Number PTA 6084, and transgenic seeds comprising a polynucleotide molecule of the invention that encodes a herbicide-resistant AHASL1 protein. {001491 The present invention provides methods for producing a herbicide-resistant plant, particularly a herbicide-resistant sunflower plant, through conventional plant breeding involving sexual reproduction. The methods comprise crossing a first plant that is resistant to a herbicide to a second plant that is not resistant to the herbicide. The first plant can be any of the herbicide resistant plants of the present invention including, for example, transgenic plants comprising at least one of the polynucleotides of the present invention that encode a herbicide resistant AHASL and non-transgenic sunflower plants that comprise the herbicide-resistance characteristics of the sunflower plant with ATCC Patent Deposit Number PTA-6084. The second plant can be any plant that is capable of producing viable progeny plants (i.e., seeds) when crossed with the first plant. Typically, but not necessarily, the first and second plants are of the same species. The methods of the invention can further involve one or more generations of backcrossing the progeny plants of the first cross to a plant of the same line or genotype as either the first or second plant. Alternatively, the progeny of the first cross or any subsequent cross can be crossed to a third plant that is of a different line or genotype than either the first or second plant. The methods of the invention can additionally involve selecting plants that comprise the herbicide resistance characteristics of the first plant. 48 [00150] The present invention further provides methods for increasing the herbicide resistance of a plant, particularly a herbicide-resistant sunflower plant, through conventional plant breeding involving sexual reproduction. The methods comprise crossing a first plant that is resistant to a herbicide to a second plant that may or may not be resistant to the herbicide or may be resistant to different herbicide or herbicides than the first plant. The first plant can be any of the herbicide resistant plants of the present invention including, for example, transgenic plants comprising at least one of the polynucleotides of the present invention that encode a herbicide resistant AHASL and non-transgenic sunflower plants that comprise the herbicide-resistance characteristics of the sunflower plant with ATCC Patent Deposit Number PTA-6084. The second plant can be any plant that is capable of producing viable progeny plants (i.e., seeds) when crossed with the first plant. Typically, but not necessarily, the first and second plants are of the same species. The progeny plants produced by this method of the present invention have increased resistance to a herbicide when compared to either the first or second plant or both. When the first and second plants are resistant to different herbicides, the progeny plants will have the combined herbicide resistance characteristics of the first and second plants. The methods of the invention can further involve one or more generations of backcrossing the progeny plants of the first cross to a plant of the same line or genotype as either the first or second plant. Alternatively, the progeny of the first cross or any subsequent cross can be crossed to a third plant that is of a different line or genotype than either the first or second plant. The methods of the invention can additionally involve selecting plants that comprise the herbicide resistance characteristics of the first plant, the second plant, or both the first and the second plant. 1001511 The present invention provides methods that involve the use of an AHAS inhibiting herbicide. In these methods, the AHAS-inhibiting herbicide can be applied by any method known in the art including, but not limited to, seed treatment, soil treatment, and foliar treatment. [001521 Prior to application, the AHAS-inhibiting herbicide can be converted into the customary formulations, for example solutions, emulsions, suspensions, dusts, powders, pastes and granules. The use form depends on the particular intended purpose; in each 49 case, it should ensure a fine and even distribution of the compound according to the invention. [00153] The formulations are prepared in a known manner (see e.g. for review US 3,060,084, EP-A 707 445 (for liquid concentrates), Browning, "Agglomeration", Chemical Engineering, Dec. 4, 1967, 147-48, Perry's Chemical Engineer's Handbook, 4th Ed., McGraw-Hill, New York, 1963, pages 8-57 and et seq. WO 91/13546, US 4,172,714, US 4,144,050, US 3,920,442, US 5,180,587, US 5,232,701, US 5,208,030, GB 2,095,558, US 3,299,566, Klingman, Weed Control as a Science, John Wiley and Sons, Inc., New York, 1961, Hance et al., Weed Control Handbook, 8th Ed., Blackwell Scientific Publications, Oxford, 1989 and Mollet, H., Grubemann, A., Formulation technology, Wiley VCH Verlag GmbH, Weinheim (Germany), 2001, 2. D. A. Knowles, Chemistry and Technology of Agrochemical Formulations, Kluwer Academic Publishers, Dordrecht, 1998 (ISBN 0-7514-0443-8), for example by extending the active compound with auxiliaries suitable for the formulation of agrochemicals, such as solvents and/or carriers, if desired emulsifiers, surfactants and dispersants, preservatives, antifoaming agents, anti-freezing agents, for seed treatment formulation also optionally colorants and/or binders and/or gelling agents. [001541 Examples of suitable solvents are water, aromatic solvents (for example Solvesso products, xylene), paraffins (for example mineral oil fractions), alcohols (for example methanol, butanol, pentanol, benzyl alcohol), ketones (for example cyclohexanone, gamma-butyrolactone), pyrrolidones (NMP, NOP), acetates (glycol diacetate), glycols, fatty acid dimethylamides, fatty acids and fatty acid esters. In principle, solvent mixtures may also be used. [00155] Examples of suitable carriers are ground natural minerals (for example kaolins, clays, tale, chalk) and ground synthetic minerals (for example highly disperse silica, silicates). [001561 Suitable emulsifiers are nonionic and anionic emulsifiers (for example polyoxyethylene fatty alcohol ethers, alkylsulfonates and arylsulfonates). [001571 Examples of dispersants are lignin-sulfite waste liquors and methylcellulose. 50 1001581 Suitable surfactants used are alkali metal, alkaline earth metal and ammonium salts of lignosulfonic acid, naphthalenesulfonic acid, phenolsulfonic acid, dibutylnaphthalenesulfonic acid, alkylarylsulfonates, alkyl sulfates, alkylsulfonates, fatty alcohol sulfates, fatty acids and sulfated fatty alcohol glycol ethers, furthermore condensates of sulfonated naphthalene and naphthalene derivatives with formaldehyde, condensates of naphthalene or of naphthalenesulfonic acid with phenol and formaldehyde, polyoxyethylene octylphenol ether, ethoxylated isooctylphenol, octylphenol, nonylphenol, alkylphenol polyglycol ethers, tributylphenyl polyglycol ether, tristearylphenyl polyglycol ether, alkylaryl polyether alcohols, alcohol and fatty alcohol ethylene oxide condensates, ethoxylated castor oil, polyoxyethylene alkyl ethers, ethoxylated polyoxypropylene, lauryl alcohol polyglycol ether acetal, sorbitol esters, lignosulfite waste liquors and methylcellulose. 1001591 Substances which are suitable for the preparation of directly sprayable solutions, emulsions, pastes or oil dispersions are mineral oil fractions of medium to high boiling point, such as kerosene or diesel oil, furthermore coal tar oils and oils of vegetable or animal origin, aliphatic, cyclic and aromatic hydrocarbons, for example toluene, xylene, paraffin, tetrahydronaphthalene, alkylated naphthalenes or their derivatives, methanol, ethanol, propanol, butanol, cyclohexanol, cyclohexanone, isophorone, highly polar solvents, for example dimethyl sulfoxide, N-methylpyrrolidone or water. 1001601 Also anti-freezing agents such as glycerin, ethylene glycol, propylene glycol and bactericides such as can be added to the formulation. [00161] Suitable antifoaming agents are for example antifoaming agents based on silicon or magnesium stearate. [00162] Suitable preservatives are for example Dichlorophen und enzylalkoholhemiformal. [001631 Seed Treatment formulations may additionally comprise binders and optionally colorants. [001641 Binders can be added to improve the adhesion of the active materials on the seeds after treatment. Suitable binders are block copolymers EO/PO surfactants but also polyvinylalcoholsl, polyvinylpyrrolidones, polyacrylates, polymethacrylates, polybutenes, polyisobutylenes, polystyrene, polyethyleneamines, polyethyleneamides, 51 polyethyleneimines (Lupasol@, Polymin@), polyethers, polyurethans, polyvinylacetate, tylose and copolymers derived from these polymers. 100165] Optionally, also colorants can be included in the formulation. Suitable colorants or dyes for seed treatment formulations are Rhodamin B, C.I. Pigment Red 112, C.I. Solvent Red 1, pigment blue 15:4, pigment blue 15:3, pigment blue 15:2, pigment blue 15:1, pigment blue 80, pigment yellow 1, pigment yellow 13, pigment red 112, pigment red 48:2, pigment red 48:1, pigment red 57:1, pigment red 53:1, pigment orange 43, pigment orange 34, pigment orange 5, pigment green 36, pigment green 7, pigment white 6, pigment brown 25, basic violet 10, basic violet 49, acid red 51, acid red 52, acid red 14, acid blue 9, acid yellow 23, basic red 10, basic red 108. 1001661 An examples of a suitable gelling agent is carrageen (Satiagel*). [00167] Powders, materials for spreading, and dustable products can be prepared by mixing or concomitantly grinding the active substances with a solid carrier. (00168] Granules, for example coated granules, impregnated granules and homogeneous granules, can be prepared by binding the active compounds to solid carriers. Examples of solid carriers are mineral earths such as silica gels, silicates, tale, kaolin, attaclay, limestone, lime, chalk, bole, less, clay, dolomite, diatomaceous earth, calcium sulfate, magnesium sulfate, magnesium oxide, ground synthetic materials, fertilizers, such as, for example, ammonium sulfate, ammonium phosphate, ammonium nitrate, ureas, and products of vegetable origin, such as cereal meal, tree bark meal, wood meal and nutshell meal, cellulose powders and other solid carriers. [001691 In general, the formulations comprise from 0.01 to 95% by weight, preferably from 0.1 to 90% by weight, of the ALIAS-inhibiting herbicide. In this case, the AHAS inhibiting herbicides are employed in a purity of from 90% to 100% by weight, preferably 95% to 100% by weight (according to NMR spectrum). For seed treatment purposes, respective formulations can be diluted 2-10 fold leading to concentrations in the ready to use preparations of 0.01 to 60% by weight active compound by weight, preferably 0.1 to 40% by weight. [00170] The AHAS-inhibiting herbicide can be used as such, in the form of their formulations or the use forms prepared therefrom, for example in the form of directly sprayable solutions, powders, suspensions or dispersions, emulsions, oil dispersions, 52 pastes, dustable products, materials for spreading, or granules, by means of spraying, atomizing, dusting, spreading or pouring. The use forms depend entirely on the intended purposes; they are intended to ensure in each case the finest possible distribution of the AHAS-inhibiting herbicide according to the invention. [001711 Aqueous use forms can be prepared from emulsion concentrates, pastes or wettable powders (sprayable powders, oil dispersions) by adding water. To prepare emulsions, pastes or oil dispersions, the substances, as such or dissolved in an oil or solvent, can be homogenized in water by means of a wetter, tackifier, dispersant or emulsifier. However, it is also possible to prepare concentrates composed of active substance, wetter, tackifier, dispersant or emulsifier and, if appropriate, solvent or oil, and such concentrates are suitable for dilution with water. [001721 The active compound concentrations in the ready-to-use preparations can be varied within relatively wide ranges. In general, they are from 0.0001 to 10%, preferably from 0.01 to 1% per weight. 1001731 The AHAS-inhibiting herbicide may also be used successfully in the ultra-low volume process (ULV), it being possible to apply formulations comprising over 95% by weight of active compound, or even to apply the active compound without additives. [001741 The following are examples of formulations: [00175] 1. Products for dilution with water for foliar applications. For seed treatment purposes, such products may be applied to the seed diluted or undiluted. [001761 A) Water-soluble concentrates (SL, LS) [001771 Ten parts by weight of the AHAS-inhibiting herbicide are dissolved in 90 parts by weight of water or a water-soluble solvent. As an alternative, wetters or other auxiliaries are added. The AHAS-inhibiting herbicide dissolves upon dilution with water, whereby a formulation with 10 % (w/w) of AHAS- inhibiting herbicide is obtained. [00178] B) Dispersible concentrates (DC) [00179] Twenty parts by weight of the AHAS-inhibiting herbicide are dissolved in 70 parts by weight of cyclohexanone with addition of 10 parts by weight of a dispersant, for example polyvinylpyrrolidone. Dilution with water gives a dispersion, whereby a formulation with 20% (w/w) of AHAS-inhibiting herbicide is obtained. 53 1001801 C) Emulsifiable concentrates (EC) [00181] Fifteen parts by weight of the AHAS-inhibiting herbicide are dissolved in 7 parts by weight of xylene with addition of calcium dodecylbenzenesulfonate and castor oil ethoxylate (in each case 5 parts by weight). Dilution with water gives an emulsion, whereby a formulation with 15% (w/w) of AHAS-inhibiting herbicide is obtained. [00182] D) Emulsions (EW, EO, ES) 100183] Twenty-five parts by weight of the AHAS-inhibiting herbicide are dissolved in 35 parts by weight of xylene with addition of calcium dodecylbenzenesulfonate and castor oil ethoxylate (in each case 5 parts by weight). This mixture is introduced into 30 parts by weight of water by means of an emulsifier machine (e.g. Ultraturrax) and made into a homogeneous emulsion. Dilution with water gives an emulsion, whereby a formulation with 25% (w/w) of AHAS-inhibiting herbicide is obtained. [00184] E) Suspensions (SC, OD, FS) [001851 In an agitated ball mill, 20 parts by weight of the AHAS-inhibiting herbicide are comminuted with addition of 10 parts by weight of dispersants, wetters and 70 parts by weight of water or of an organic solvent to give a fine AHAS- inhibiting herbicide suspension. Dilution with water gives a stable suspension of the AHAS-inhibiting herbicide, whereby a formulation with 20% (w/w) of AHAS-inhibiting herbicide is obtained. 1001861 F) Water-dispersible granules and water-soluble granules (WG, SG) 1001871 Fifty parts by weight of the AHAS-inhibiting herbicide are ground finely with addition of 50 parts by weight of dispersants and wetters and made as water-dispersible or water- soluble granules by means of technical appliances (for example extrusion, spray tower, fluidized bed). Dilution with water gives a stable dispersion or solution of the AHAS-inhibiting herbicide, whereby a formulation with 50% (w/w) of AHAS- inhibiting herbicide is obtained. [00188] G) Water-dispersible powders and water-soluble powders (WP, SP, SS, WS) [00189] Seventy-five parts by weight of the AHAS-inhibiting herbicide are ground in a rotor-stator mill with addition of 25 parts by weight of dispersants, wetters and silica gel. Dilution with water gives a stable dispersion or solution of the AHAS- inhibiting 54 herbicide, whereby a formulation with 75% (w/w) of AHAS-inhibiting herbicide is obtained. [001901 I) Gel-Formulation (GF) [001911 In an agitated ball mill, 20 parts by weight of the AHAS-inhibiting herbicide are comminuted with addition of 10 parts by weight of dispersants, 1 part by weight of a gelling agent wetters and 70 parts by weight of water or of an organic solvent to give a fine AHAS-inhibiting herbicide suspension. Dilution with water gives a stable suspension of the AHAS- inhibiting herbicide, whereby a formulation with 20% (w/w) of AHAS-inhibiting herbicide is obtained. This gel formulation is suitable for us as a seed treatment. [00192] 2. Products to be applied undiluted for foliar applications. For seed treatment purposes, such products may be applied to the seed diluted. 1001931 A) Dustable powders (DP, DS) 1001941 Five parts by weight of the AHAS-inhibiting herbicide are ground finely and mixed intimately with 95 parts by weight of finely divided kaolin. This gives a dustable product having 5% (w/w) of AHAS-inhibiting herbicide. [001951 B) Granules (GR, FG, GG, MG) [00196 One-half part by weight of the AHAS-inhibiting herbicide is ground finely and associated with 95.5 parts by weight of carriers, whereby a formulation with 0.5% (w/w) of AHAS-inhibiting herbicide is obtained. Current methods are extrusion, spray-drying or the fluidized bed. This gives granules to be applied undiluted for foliar use. [001971 Conventional seed treatment formulations include for example flowable concentrates FS, solutions LS, powders for dry treatment DS, water dispersible powders for slurry treatment WS, water-soluble powders SS and emulsion ES and EC and gel formulation GF. These formulations can be applied to the seed diluted or undiluted. Application to the seeds is carried out before sowing, either directly on the seeds. [00198] In a preferred embodiment a FS formulation is used for seed treatment. Typcially, a FS formulation may comprise 1-800 g/1 of active ingredient, 1-200 g/l Surfactant, 0 to 200 g/l antifreezing agent, 0 to 400 g/1 of binder, 0 to 200 g/l of a pigment and up to 1 liter of a solvent, preferably water, 55 [001991 The present invention non-transgenic and transgenic seeds of the herbicide resistant plants of the present invention. Such seeds include, for example, non-transgenic sunflower seeds comprising the herbicide-resistance characteristics of the plant with ATCC Patent Deposit Number PTA-6084, and transgenic seeds comprising a polynucleotide molecule of the invention that encodes a herbicide-resistant AHASLI protein. [002001 For seed treatment, seeds of the herbicide resistant plants according of the present invention are treated with herbicides, preferably herbicides selected from the group consisting of AHAS-inhibiting herbicides such as amidosulfuron, azimsulfuron, bensulfuron, chlorimuron, chlorsulfuron, cinosulfuron, cyclosulfamuron, ethametsulfuron, ethoxysulfuron, fiazasulfuron, flupyrsulfuron, foramsulfuron, halosulfuron, imazosulfuron, iodosulfuron, mesosulfuron, metsulfuron, nicosulfuron, oxasulfuron, primisulfuron, prosulfuron, pyrazosulfuron, rimsulfuron, sulfometuron, sulfosulfuron, thifensulfuron, triasulfuron, tribenuron, trifioxysulfuron, triiiusulfuron, tritosulfuron, imazamethabenz, imazamox, imazapic, imazapyr, imazaquin, imazethapyr, cloransulam, diclosulam, florasulam, flumetsulam, metosulam, penoxsulam, bispyribac, pyriminobac, propoxycarbazone, flucarbazone, pyribenzoxim, pyriftalid, pyrithiobac, and mixtures thereof, or with a formulation comprising a AHAS-inhibiting herbicide. [002011 The term seed treatment comprises all suitable seed treatment techniques known in the art, such as seed dressing, seed coating, seed dusting, seed soaking, and seed pelleting. [00202] In accordance with one variant of the present invention, a further subject of the invention is a method of treating soil by the application, in particular into the seed drill: either of a granular formulation containing the AHAS-inhibiting herbicide as a composition/formulation (e.g .a granular formulation, with optionally one or more solid or liquid, agriculturally acceptable carriers and/or optionally with one or more agriculturally acceptable surfactants. This method is advantageously employed, for example, in seedbeds of cereals, maize, cotton, and sunflower. 1002031 The present invention also comprises seeds coated with or containing with a seed treatment formulation comprising at least one ALS inhibitor selected from the group consisting of amidosulfuron, azimsulfuron, bensulfuron, chlorimuron, chlorsulfuron, 56 cinosulfuron, cyclosulfamuron, ethametsulfuron, ethoxysulfuron, flazasulfuron, flupyrsulfuron, foramsulfuron, halosulfuron, imazosulfuron, iodosulfuron, mesosulfuron, metsulfuron, nicosulfuron, oxasulfuron, primisulfuron, prosulfuron, pyrazosulfuron, rimsulfuron, sulfometuron, sulfosulfuron, thifensulfuron, triasulfuron, tribenuron, trifloxysulfuron, triflusulfuron, tritosulfuron, imazamethabenz, imazamox, imazapic, imazapyr, imazaquin, imazethapyr, cloransulam, diclosulam, florasulam, flumetsulam, metosulam, penoxsulam, bispyribac, pyriminobac, propoxycarbazone, flucarbazone, pyribenzoxim, pyriflalid and pyrithiobac. [00204] The term seed embraces seeds and plant propagules of all kinds including but not limited to true seeds, seed pieces, suckers, corms, bulbs, fruit, tubers, grains, cuttings, cut shoots and the like and means in a preferred embodiment true seeds. [00205] The term "coated with and/or containing" generally signifies that the active ingredient is for the most part on the surface of the propagation product at the time of application, although a greater or lesser part of the ingredient may penetrate into the propagation product, depending on the method of application. When the said propagation product is (re)planted, it may absorb the active ingredient. 1002061 The seed treatment application with the AHAS-inhibiting herbicide or with a formulation comprising the AHAS-inhibiting herbicide is carried out by spraying or dusting the seeds before sowing of the plants and before emergence of the plants. [002071 In the treatment of seeds, the corresponding formulations are applied by treating the seeds with an effective amount of the AHAS-inhibiting herbicide or a formulation comprising the AHAS-inhibiting herbicide. Herein, the application rates are generally from 0.1 g to 10 kg of the a.i. (or of the mixture of a.i. or of the formulation) per 100 kg of seed, preferably from 1 g to 5 kg per 100 kg of seed, in particular from 1 g to 2.5 kg per 100 kg of seed. For specific crops such as lettuce the rate can be higher. [00208] The present invention provides a method for combating undesired vegetation or controlling weeds comprising contacting the seeds of the resistant plants according to the present invention before sowing and/or after pregermination with an AHAS-inhibiting herbicide. The method can further comprise sowing the seeds, for example, in soil in a field or in a potting medium in greenhouse. The method finds particular use in combating undesired vegetation or controlling weeds in the immediate vicinity of the seed. 57 [00209] The control of undesired vegetation is understood as meaning the killing of weeds and/or otherwise retarding or inhibiting the normal growth of the weeds. Weeds, in the broadest sense, are understood as meaning all those plants which grow in locations where they are undesired. [00210] The weeds of the present invention include, for example, dicotyledonous and monocotyledonous weeds. Dicotyledonous weeds include, but are not limited to, weeds of the genera: Sinapis, Lepidium, Galium, Stellaria, Matricaria, Anthemis, Galinsoga, Chenopodium, Urtica, Senecio, Amaranthus, Portulaca, Xanthium, Convolvulus, Ipomoea, Polygonum, Sesbania, Ambrosia, Cirsium, Carduus, Sonchus, Solanuni, Rorippa, Rotala, Lindernia, Lamiurn, Veronica, Abutilon, Emex, Datura, Viola, Galeopsis, Papaver, Centaurea, Trifolium, Ranunculus, and Taraxacum. Monocotyledonous weeds include, but are not limited to, weeds of of the genera: Echinochloa, Setaria, Panicum, Digitaria, Phleum, Poa, Festuca, Eleusine, Brachiaria, Lolium, Bromus, Avena, Cyperus, Sorghum, Agropyron, Cynodon, Monochoria, Fimbristyslis, Sagittaria, Eleocharis, Scirpus, Paspalum, Ischaemum, Sphenoclea, Dactyloctenium, Agrostis, Alopecurus, Apera. [002111 In addition, the weeds of the present invention can include, for example, crop plants that are growing in an undesired location. For example, a volunteer maize plant that is in a field that predominantly comprises soybean plants can be considered as a weed, if the maize plant is undesired in the field of soybean plants. [00212] The articles "a" and "an" are used herein to refer to one or more than one (i.e., to at least one) of the grammatical object of the article. By way of example, "an element" means one or more elements. [00213] As used herein, the word "comprising," or variations such as "comprises" or "comprising," will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps. [002141 The following examples are offered by way of illustration and not by way of limitation. 58 EXAMPLE 1: Mutagenesis of Helianthus annuus Line HA89 and Selection of Imidazolinone-Resistant Plants [002151 In the fall of growing season 1, sunflower plants (Helianthus annuus) of the maintainer line HA89 were treated with ethyl methanesulfonate (EMS, also referred to as methanesulfonic acid ethyl ester). EMS is a known mutagen that typically induces G-C to-A-T transitions in DNA (Jander et al. (2003) Plant Physiol. 131:139-146). Two separate experiments were conducted. In the first experiment, three concentrations of EMS were used. Plants were treated with a solution comprising 0.1%, 1%, or 10% (w/v) EMS. For each EMS treatment, 14 rows of seeds were sown outdoors at the Advanta Semillas Biotech Research Station in Balcarce, BsAs, Argentina. [002161 In the second experiment, 25 rows of line HA89 sunflower seeds were sown outdoors at the Advanta Winter Nursery in Oran, Salta, Argentina. Of these 25 rows, 8 rows were treated with 5% EMS as described above. The remaining 17 rows were untreated. [002171 For each of the experiments, all Mo plants were bagged prior to flowering in order to ensure that the resulting Ml seeds were the product of self-pollination. The seed heads from each EMS treatment were harvested and threshed in bulk. The following growing season, the mutated MI seeds from plants that were treated with 0.1%, 1.0%, 5.0% or 10.0% EMS were sown outdoors with each treatment in a separate plot. Twenty days later, when the plants were at the 2-4 leaf pair developmental stage, all of the EMS treated plants were sprayed with 2X of Sweeper 70DG (100 g a.i./ha). The active ingredient in Sweeper is imazamox. After the herbicide spraying, a total of 53 plants survived and were selected as putative resistant. The distribution of resistant plants per EMS treatment is indicated in Table 1. 59 Table 1. Number of M 1 Imidazolinone-Resistant Sunflower Plants Recovered from Each EMS Treatment EMS Concentration (%) No. of Resistant Plants Recovered 0.1 14 1 18 5 5 10 16 1002181 Tissue samples were taken from each individual surviving M, plant and DNA from each sample was extracted for PCR amplification and sequencing studies described below in Example 2. [002191 The 53 putative resistant plants (Table 1) were allowed to mature in the field. Of these 53 plants, 29 produced M 2 seeds, and these seeds were harvested. Shortly thereafter each of these M 1
,
2 families was sown in a separate plot (i.e., 29 plots, of 1 to 3 rows each in Fargo, North Dakota, USA. These M,2 families, and susceptible (wild-type) HA89 control plants, were sprayed with 0.5 X of Sweeper (25 g a.iiha). Eleven days after the herbicide treatment, three families were identified for which greater than 50% of the plants survived the herbicide treatment. Before flowering, the surviving plants in each these three M]:2 families were bagged in order to produce self-pollinated M 3 seed. Individual heads from each M1: 2 plant were harvested and threshed. Individual M 2 plant tissue from selected families was harvested. EXAMPLE 2: PCR Amplification and Sequencing of Sunflower Polynucleotides Encoding Imidazolinone-Resistant and Wild-Type AHASLI Proteins 1002201 DNA was extracted from M tissue of one of the three the M1: 2 families that were described above in Example 1. The DNA from this M plant was subjected to amplification by polymerase chain reaction (PCR) and sequenced to determine the origin of the imidazolinone tolerance described in detail below. 60 [00221] The M, plant from this family was designated as MUT28. Genomic DNA was isolated from MUT28 tissue and also from tissue of a wild-type HA89 plant. The isolated DNA samples from MUT28 and HA89 were each diluted to a stock concentration of 1 OOng/pL for use as template DNA for PCR amplifications. The entire coding region of the sunflower AHASL1 gene was amplified from the MUT28 and HA89 DNA samples. The specific primers used to obtain each amplicon are set forth in Table 2. Table 2. PCR Primers for Amplifying the Coding Region of the Sunflower AHASL1 Gene Region of AHAS) Primer Name Primer Sequence CATCATCATTAAATAACCAGAC ALS1-1F 1st amplicon (SEQ ID NO: 11) (843 bp) AACCCGGTAACCTCATCGGTTC ALS1-1R (SEQ ID NO: 12) CCCGGTTTTGATAGATGTACCG ALS1-2F 2 nd amplicon (SEQ ID NO: 13) (739 bp) CTGAGCAGCCCACATCTGATGT ALS1-2R (SEQ ID NO: 14) CTGAGCAGCCCACATCTGATGT ALS1-3F 3 rd amplicon (SEQ ID NO: 15) (674 bp) AATTACACAACAAAACATTAAC ALS1-3R (SEQ ID NO: 16) [002221 From comparisons of the nucleotide sequences of known AHASL1, AHASL2, and AHASL3 genes, PCR primers were designed to specifically amplify the AHASL1 gene from sunflower. The following PCR conditions were used in a total reaction volume of 25RI: 1X buffer (Invitrogen Corp., Carlsbad, CA, USA), 0.2mM dNTPs (Invitrogen), 2.5mM MgCl 2 (Invitrogen), 0.2kM of each primer, 0.5pL of Platinium Taq (5U/pL) (Invitrogen) and 100 ng of genomic DNA. PCR reactions were carried out in a GeneAmp 61 PCR System 9700 (PerkinElmer, Inc., Boston, MA, USA). Cycling conditions were: an initial denaturation step at 94 0 C for 1 minute followed by 35 cycles consisting of 94 0 C for 45 seconds, 521C for 45 seconds and 72 0 C for 70 seconds, and a final elongation step of 72 0 C for 10 minutes. Two microliters of each resulting PCR product were then analyzed by agarose gel electrophoresis and concentration of DNA estimated by comparison to Low DNA Mass Ladder (Invitrogen Corp., Carlsbad, CA, USA). The remaining PCR product was purified using Wizard® SV Gel and PCR Clean-Up System (Promega Corp., Madison, WI, USA). The purified PCR products were then cycle-sequenced using a BigDye@ Terminator v3.1 Cycle Sequencing Kit (Applied Biosystems, Foster City, CA, USA) following the manufacturer's instructions. In addition to the primers used for the PCR amplifications (Table 2), additional primers set forth in Table 3 were used to complete the sequencing of the entire coding region of the sunflower AHASL1 gene. Table 3, Additional Primers for Sequencing the Coding Region of the Sunflower AHASL 1 gene Region of AHASI Primer Name Primer Sequence GCGCTGTTAGACAGTGTCC 1st amplicon ALS-3F(SQINO17 (SEQ ID NO: 17) 2 nd amplicon SUNALS1F1 ACTAATCTTGATTTTTCG (SEQ ID NO: 18) 34 amplicon ALS-6R CGGCAGATTTTCAACACGGA (SEQ ID NO: 19) [002231 Fluorescent-labeled products from sequencing reactions were resolved by capillary electrophoresis on an ABI Prism 310 Genetic Analyzer (Applied Biosystems) and analyzed using the ABI Prism DNA Sequencing Analysis Software, version 3.7. The sunflower AHASLI sequencing files obtained from each amplicon were assembled using the Vector NTI Suite-Contig Express software, version 7.0 (InforMax, Frederick, MD, 62 USA). The resulting DNA sequences were aligned with AHASLI polynucleotide sequences of the HA89 sunflower line and Xanthium sp. (Figure 1). The predicted amino acid sequence from the new mutant sunflower AHASLI gene was aligned with the AHASLI amino acid sequences of HA89 and Xanthium sp. (Figure 2) using Vector NTI Suite-AlignX software, version 7.0 (InforMax) was used with default parameters. Single nucleotide polymorphisms and amino acid changes were then identified. EXAMPLE 3: The Herbicide-Resistance of MUT28 Sunflower Plants [00224] To evaluate the resistance of MUT28 sunflower plants to an imidazolinone herbicides, HA89 (wild-type), MUT28 (homozygous), and HA89/MUT28 (heterozygous) sunflower plants were planted outdoors in Balcarce, Argentina during the growing season in a randomized complete block design (RCBD) field trial with two replications to evaluate the tolerance of the MLTT28 and HA89/MUT28 plants to three rates of Sweeper 70DG: IX, 2X, and 3X. The active ingredient in Sweeper is imazamox and the IX dose is 50 g ai./ha. The results are presented in Table 4. Table 4. Imidazolinone Tolerance of MUT28 Sunflower Plants (Herbicide Injury Ratings) RATE LINE OX IX 2X HA89 0* 75 75 MUT28 across families 0 33 - HA89/MUT28 0 28 45 IMISUN-1 0 4 9 *No injury = 0 100225] Compared to wild-type HA89, the MUT28 sunflower lines had less injury at the IX rate of Sweeper. The HA89/MUT28 line also had less injury in this trial than HA89 at both the IX and 2X rates of Sweeper. The results of this trial demonstrate that both the MUT28 (homozygous) and HA89/MUT28 (heterozygous) lines have increased tolerance 63 to an imidazolinone herbicide, particularly imazamox. However, neither MUT28 nor HA89/MUT28 displayed the level of tolerance of the IMISUN- I sunflower lines which is known to be homozygous for an AHASLI gene encoding an AHASLI protein having an Ala 9 o -to-Val substitution. [00226] In a separate trial in Balcarce that was similar to the one described immediately above, the MUT28 line did not display any increased tolerance to Sweeper relative to HA89. However, in another separate trial conducted in Fargo, ND, USA, 52% of M2 MUT28 plants were tolerant but displayed a lower level of tolerance than the SURES- 1 line. SURES-l is an sulfonylura-resistant, F3-derived F4 oilseed maintainer that was developed from plants of a wild Helianthus annuus population collected in Kansas, USA (Al-Khatib et aL (1999) "Survey of common sunflower (Helianthus annuus) resistance to ALS-inhibiting herbicides in northeast Kansas," In: Proceedings of21th Sunflower Research Workshop, National Sunflower Association, Bismarck, N.D., pp 210-215). [00227] To evaluate the tolerance of MUT28 sunflower plants to sulfonylurea herbicides, HA89 (wild-type), MUT28, IMISUN-1, and SURES-l sunflower lines were planted outdoors in Balcarce, Argentina during the growing season in an RCBD field trial with two replications to evaluate the tolerance of MUT28 plants to the sulfonylurea herbicide thifensulfuron (TFS) at IX and 2X rates. The IX rates for TFS is 4.4 g a.iiha. The results are presented in Table 5. Table 5. Sulfonylurea Tolerance of MUT28 Sunflower Plants (Herbicide Injury Ratings) RATE LINE OX 1X 2X HA89 0* 75 75 MUT28 0 30 42 IMISUN-1 0 20 75 SURES-1 0 5 3 *No injury = 0 64 1002281 The MUT28 line displayed better tolerance to TFS at both the IX and 2X rates than HA89 demonstrating that the MUT28 plants have increased tolerance to a sulfonylurea herbicide when compared to a wild-type sunflower plants. EXAMPLE 4: Herbicide-Resistant Sunflower AHASL1 Proteins 1002291 The present invention discloses both the nucleotide and amino acid sequences for wild-type and herbicide resistant sunflower AHASLI polypeptides. Plants comprising herbicide-resistant AHASLI polypeptides have been previously identified, and a number of conserved regions of AHASL I polypeptides that are the sites of amino acids substitutions that confer herbicide resistance have been described. See, Devine and Eberlein (1997) "Physiological, biochemical and molecular aspects of herbicide resistance based on altered target sites". In: Herbicide Activity: Toxicology, Biochemistry and Molecular Biology, Roe et al. (eds.), pp. 159-185, IOS Press, Amsterdam; and Devine and Shukla, (2000) Crop Protection 19:881-889. [00230] Using the AHASLI sequences of the invention and methods known to those of ordinary skill in art, one can produce additional polynucleotides encoding herbicide resistant AHASLI polypeptides having one, two, three, or more amino acid substitutions at the identified sites in these conserved regions. Table 6 provides the conserved regions of AHASL 1 proteins, the amino acid substitutions known to confer herbicide resistance within these conserved regions, and the corresponding amino acids in the sunflower AHASL1 protein set forth in SEQ ID NO: 4. 65 Table 6. Mutations in conserved regions of AHASLI polypeptides known to confer herbicide-resistance and their equivalent position in sunflower AHASLi Conserved region Mutation 2 Reference Amino acid position in sunflower Ala 22 to Thr Bernasconi et al.4 VFAYPGGASMEIHQALTRS' Ala 07 Wright and Penner' 4 Pro 97 to Ala Boutsalis el al 6 Pro 1 g 7 to Thr Guttieri et al. Pro 1 9 7 to His Guttieri et al. Pro, 97 to Leu Guttieri et al.
7
AITGQVPRRMIGT
3 Kolkman et al.
5 Pro 8 2 13 Pro 1 9 7 to Arg Guttieri et al.
7 Pro 197 to Ile Boutsalis et al. Pro, 97 to Gln Guttieri et al.7 Pro1 97 to Ser Guttieri et al.
7 Ala 20 5 to Asp Hartnett et al 9 Ala 205 to Val Simpson 0 AFQETP Aa1% Kolkman et al. 1 6 White et al. QWED Trp 57 4 to Leu Bruniard" Boutsalis et al. Ser 653 to Asn Devine & Eberlein' 2 Lee et al.
17 IPsGG 4 Ala 638 Ser 65 3 to Thr Chang and Dugglebyi Ser 653 to Phe 66 [00231] 'Conserved regions from Devine and Eberlein (1997) "Physiological, biochemical and molecular aspects of herbicide resistance based on altered target sites". In: Herbicide Activity: Toxicology, Biochemistry and Molecular Biology, Roe et al. (eds.), pp. 159-185, IOS Press, Amsterdam and Devine and Shukla, (2000) Crop Protection 19:881-889. [00232] 2 Amino acid numbering corresponds to the amino acid sequence of the Arabidopsis thaliana AHASL1 polypeptide. 1002331 3 Sunflower AHASLI (SEQ ID NO:4) has the same conserved region. [00234] 4 The region of the sunflower AHASLI (SEQ ID NO:4) corresponding to this conserved region has the sequence IPAGG. [00235] 5 Bernasconi et al. (1995) J BioL Chem. 270(29):17381-17385. [00236 6 fBoutsalis et al. (1999) Pestic. Sci. 55:507-516. [00237] 7 Guttieri et al. (1995) Weed Sci. 43:143-178. [00238] Guttieri et al. (1992) Weed Sci. 40:670-678. [00239] 'Hartnett et al. (1990) "Herbicide-resistant plants carrying mutated acetolactate synthase genes," In: Managing Resistance to Agrochemicals: Fundamental Research to Practical Strategies, Green et al. (eds.), American Chemical Soc. Symp., Series No. 421, Washington, DC, USA 100240 10 Simpson (1998) Down to Earth 53(l):26-35. (00241] "Bruniard (2001) Inheritance of imidazolinone resistance, characterization of cross-resistance pattern, and identification of molecular markers in sunflower (Helianthus annuus L.). Ph.D. Thesis, North Dakota State University, Fargo, ND, USA, pp 1-78. [00242] 1 2 Devine and Eberlein (1997) "Physiological, biochemical and molecular aspects of herbicide resistance based on altered target sites". In: Herbicide Activity: Toxicology, Biochemistry and Molecular Biology, Roe et al. (eds.), pp. 159-185, IOS Press, Amsterdam [00243] "The present invention discloses the amino acid sequence of a herbicide resistant AHASLI with the ProIg 2 to Leu substitution (SEQ ID NO: 2) and a polynucleotide sequence encoding this herbicide resistant AHASL1 (SEQ ID NO: 1). 67 [002441 "'Wright and Penner (1998) Theor. AppL Genet. 96:612-620. [002451 ' 5 Kolkman et al. (2004) Theor. AppL Genet. 109: 1147-1159. 1002461 1 6 White et al. (2003) Weed Sci. 51 :845-853. 1002471 17 Lee et al. (1999) FEBS Lett. 452:341-345. [002481 "Chang and Duggleby (1998) Biochem J. 333:765-777. [00249] All publications and patent applications mentioned in the specification are indicative of the level of those skilled in the art to which this invention pertains. All publications and patent applications are herein incorporated by reference to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference. [00250] Although the foregoing invention has been described in some detail by way of illustration and example for purposes of clarity of understanding, it will be obvious that certain changes and modifications may be practiced within the scope of the appended claims. [002511 Comprises/comprising and grammatical variations thereof when used in this specification are to be taken to specify the presence of stated features, integers, steps or components or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. 68 egsausae iurapik it rearmns 3886/NG4 90728!005 INDICA110NBRMAWL1R DEPS1fEDM R00RGAIUS ORlOTRI 0W0AL MATEWL L aFiherepos l Mummaannedondaqddn d ts lhmoldepoanqkin Anedmn Type Oin CdeIon (ATOC) 1001 Unh*d .M sum, VA201 ti2200 USA 18 Ju=e 29Q4 PTAM084 1bham~obu* us$dail% . arNuMenUennmenSsd.wea usoo 69 ATCC u~ea~n-zW e r4a.t aimWsuUant SUX in boom VArMONuf UO WkATWO4dR T O*nsam XMnufDepodimr orAftfrrtn) iASFctasa Mmom Datoam i..26 isaw B i dim tadiadesvm wmpattMbt; atflsdgsdenepGg apoposw4teratd du#Cd#dinuWW#d abne;tfltiuduimuseintvd Ilbydts sIerA WSafbpOpUhITy Auflisity SdliUe bashbu beApWOt1 ATTOUXDQuWsb 2K WewIUbrayou ofnrqtw tergmazessrreo R7 flernanau lc uuwaa~fi*t a Ee oirystanddapedenetyafltfff e'sMktaW flvtmteristE.Ttet Is I 4bgeiwwaetks and ATOC~k hfrutd Irbctemgd graea Patent & WadpaOjurith.4emeenadaar i rassatases. Wf~tsecstsi*biddiolrbed4Ost i fiusumlee ftgrme ti epost. UbIts VRyour ty fttaniautfor nuaminw de SrarkIndCn.The traufadst omarlnv"nstrieu t flb*Imyrtstttlsba sl$abpwwustansi.flJS.Osbt aitc, tM eeds wnao. 5St& tZ406wD No~qt AsmUip AsxedesnTypo Ctfsn Co~eetoc MZ*UnSVA20ZO! a jOIWWA bitnteraurtena aniugstiyiny nprwsdA TOCC 0$s DvWL&zft 70 ATO Vim 3*15,hkd005b 75SPS*65 swdi~avmue ct SM uab@Hoflm4td4 Tug~~~ I ,aUR2 71
Claims (12)
1. A seed of a sunflower plant, wherein said sunflower plant: (a) is a plant of line MUT28, a representative sample of seed of the line having been deposited under ATCC Patent Deposit Number PTA-6084; (b) is a progeny of a plant of line MUT28; (c) is a progeny of line MUT28 and a plant of a second different sunflower line; (d) is a mutant, recombinant, or a genetically engineered derivative of line MUT28 or of any progeny of a plant of line MUT28; or (e) is a plant that is a descendant of any one of the plants of (a)-(d), wherein said sunflower plant comprises a MUT28 herbicide-tolerant acetohydroxyacid synthase large subunit 1 (AHASL1) polynucleotide encoding an AHASLI protein comprising a leucine, an alanine, a threonine, a histidine, an arginine, or an isoleucine at amino acid position 182 or equivalent position relative to the amino acid sequence set forth in SEQ ID NO:4, wherein said sunflower plant exhibits increased tolerance to an imidazolinone herbicide as compared to that of a wild-type sunflower plant, wherein said seed comprises a seed treatment.
2. A seed of a transformed sunflower plant comprising stably incorporated in its genome a polynucleotide construct comprising an AHASL1 polynucleotide operably linked to a promoter that drives expression in a plant cell, wherein the AHASLI polynucleotide encodes an AHASLI protein comprising a leucine, an alanine, a threonine, a histidine, an arginine, or an isoleucine at amino acid position 182 or equivalent position relative to the amino acid sequence set forth in SEQ ID NO:4, wherein the tolerance of said transformed plant to an herbicide is increased when compared to that of an untransformed plant, wherein said seed comprises the polynucleotide construct, and wherein said seed comprises a seed treatment.
3. The seed of claim 1 or 2, wherein the AHASLI protein further comprises: (i) a threonine at amino acid position 107 or equivalent position relative to the amino acid sequence set forth in SEQ ID NO:4; 72 (ii) an aspartate or valine at amino acid position 190 or equivalent position relative to the amino acid sequence set forth in SEQ ID NO:4; (iii) a leucine at amino acid position 559 or equivalent position relative to the amino acid sequence set forth in SEQ ID NO:4; or (iv) an asparagine, a threonine, a phenylalanine, or a valine at amino acid position 638 or equivalent position relative to the amino acid sequence set forth in SEQ ID NO:4.
4. The seed of any one of claims 1-3, wherein the AHASLI polynucleotide comprises: a nucleotide sequence as set forth in SEQ ID NO: I or 5; or a nucleotide sequence encoding an amino acid sequence as set forth in SEQ ID NO:2 or 6.
5. The seed of any one of claims 1-4, wherein said AHASLI protein comprises the amino acid sequence set forth in SEQ ID NO:2 or 6.
6. The seed of any one of claims 1-5, wherein said seed treatment is on the surface of the seed.
7. The seed of any one of claims 1-6, wherein said seed treatment comprises an AHAS-inhibiting herbicide.
8. The seed of claim 7, wherein the AHAS-inhibiting herbicide is an imidazolinone herbicide.
9. The seed of claim 8, wherein the imidazolinone herbicide is selected from the group consisting of: 2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-nicotinic acid, 2 (4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-3-quinolinecarboxylic acid, 5-ethyl-2-(4 isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-nicotinic acid, 2-(4-isopropyl-4-methyl-5 oxo-2-imidazolin-2-yl)-5-(methoxymethyl)-nicotinic acid, 2-(4-isopropyl-4-methyl-5-oxo 2-imidazolin-2-yl)-5-methylnicotinic acid, mixtures of methyl 6-(4-isopropyl-4-methyl-5 oxo-2-imidazolin-2-yl)-m-toluate and methyl 2-(4-isopropyl-4-methyl-5-oxo-2 imidazolin-2-yl)-p-toluate, and mixtures thereof. 73
10. The seed of claim 7, wherein the AHAS-inhibiting herbicide is a sulfonylurea herbicide.
11. The seed of claim 10, wherein the sulfonylurea herbicide is selected from the group consisting of: chlorsulfuron, metsulfuron methyl, sulfometuron methyl, chlorimuron ethyl, thifensulfuron methyl, tribenuron methyl, bensulfuron methyl, nicosulfuron, ethametsulfuron methyl, rimsulfuron, triflusulfuron methyl, triasulfuron, primisulfuron methyl, cinosulfiron, amidosulfuron, flazasulfuron, imazosulfuron, pyrazosulfuron ethyl, halosulfuron, and mixtures thereof.
12. The seed of any one of the previous claims substantially as hereinbefore described. 74
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