Herbicide-resistant sunflower plants, polynucleotides encoding herbicide=resistant acetohydroxyacid synthase large subunit proteins, andmethods of use

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 herbicides, and methods for controlling weeds in the vicinity of herbicide-resistant plants are also described.

Description

Herbicide-resistant sunflower plants, polynucleotides encoding herbicide-resistant acetohydroxyacid synthase large subunit proteins, and methods of use field of invention The present invention relates to the field of agricultural biotechnology, in particular to herbicide-resistant sunflower plants and novel polynucleotide sequences encoding wild-type and herbicide-resistant sunflower acetohydroxyacid synthase large subunit proteins. Background of the invention Acetohydroxyacid synthase (AHAS; EC4.1.3.18, 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. Enzymes (Singh (1999) "Biosynthesis of valine, leucine and isoleucine", Plant Amino Acid, Singh, B.K., ed., Marcel Dekker Inc. New York, New York, pp. 227-247). AHAS is the site of action for five structurally distinct herbicide families including sulfonylureas (Tan et al., (2005) PestManag.Sci. 61:246-5...

AI Technical Summary

Problems solved by technology

The mutations described here encode cross-resistance or sulfonylurea-specific resistance to imidazolinones and sulfonylureas, but imidazolinone-specific resistance is not described

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