title: Single nucleotide mutation in the barley acetohydroxy acid synthase (AHAS) gene confers resistance to imidazolinone herbicides.
abstract: Induced mutagenesis can be an effective way to increase variability in self-pollinated crops for a wide variety of agronomically important traits. Crop resistance to a given herbicide can be of practical value to control weeds with efficient chemical use. In some crops (for example, wheat, maize, and canola), resistance to imidazolinone herbicides (IMIs) has been introduced through mutation breeding and is extensively used commercially. However, this production system imposes plant-back restrictions on rotational crops because of herbicide residuals in the soil. In the case of barley, a preferred rotational crop after wheat, a period of 9-18 mo is required. Thus, introduction of barley varieties showing resistance to IMIs will provide greater flexibility as a rotational crop. The objective of the research reported was to identify resistance in barley for IMIs through induced mutagenesis. To achieve this objective, a sodium azide-treated M(2)/M(3) population of barley cultivar Bob was screened for resistance against acetohydroxy acid synthase (AHAS)-inhibiting herbicides. The phenotypic screening allowed identification of a mutant line showing resistance against IMIs. Molecular analysis identified a single-point mutation leading to a serine 653 to asparagine amino acid substitution in the herbicide-binding site of the barley AHAS gene. The transcription pattern of the AHAS gene in the mutant (Ser653Asn) and WT has been analyzed, and greater than fourfold difference in transcript abundance was observed. Phenotypic characteristics of the mutant line are promising and provide the base for the release of IMI-resistant barley cultivar(s).
authors.affiliation: Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USA.
authors.forename: Hyejin
authors.initials: H
authors.lastname: Lee
authors.forename: Sachin
authors.initials: S
authors.lastname: Rustgi
authors.forename: Neeraj
authors.initials: N
authors.lastname: Kumar
authors.forename: Ian
authors.initials: I
authors.lastname: Burke
authors.forename: Joseph P
authors.initials: JP
authors.lastname: Yenish
authors.forename: Kulvinder S
authors.initials: KS
authors.lastname: Gill
authors.forename: Diter
authors.initials: D
authors.lastname: von Wettstein
authors.forename: Steven E
authors.initials: SE
authors.lastname: Ullrich
mesh_terms: D000095:Acetolactate Synthase / Q000235:genetics*; D019943:Amino Acid Substitution; D018556:Crops, Agricultural; D004351:Drug Resistance / Q000235:genetics*; D006540:Herbicides / Q000494:pharmacology*; D001467:Hordeum / Q000201:enzymology / Q000235:genetics*; D048288:Imidazolines / Q000494:pharmacology*; D008969:Molecular Sequence Data; D016296:Mutagenesis; D017354:Point Mutation
chemical_list: D006540:Herbicides; D048288:Imidazolines; D000095:Acetolactate Synthase