Yu, Qin and Collavo, Alberto and Zheng, Ming-Qi and Owen, Mechelle and Sattin, Maurizio and Powles, Stephen (2007) Diversity of Acetyl-Coenzyme A Carboxylase Mutations in Resistant Lolium Populations: Evaluation Using Clethodim. [Online journal papers]
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The acetyl-coenzyme A carboxylase (ACCase)-inhibiting cyclohexanedione herbicide clethodim is used to control grass weeds
infesting dicot crops. In Australia clethodim is widely used to control the weed Lolium rigidum. However, clethodim-resistant
Lolium populations have appeared over the last 5 years and now are present in many populations across the western
Australian wheat (Triticum aestivum) belt. An aspartate-2078-glycine (Gly) mutation in the plastidic ACCase enzyme has been
identified as the only known mutation endowing clethodim resistance. Here, with 14 clethodim-resistant Lolium populations
we revealed diversity and complexity in the molecular basis of resistance to ACCase-inhibiting herbicides (clethodim in
particular). Several known ACCase mutations (isoleucine-1781-leucine [Leu], tryptophan-2027-cysteine [Cys], isoleucine-2041-
asparagine, and aspartate-2078-Gly) and in particular, a new mutation of Cys to arginine at position 2088, were identified in
plants surviving the Australian clethodim field rate (60 g ha21). Twelve combination patterns of mutant alleles were revealed in
relation to clethodim resistance. Through a molecular, biochemical, and biological approach, we established that the mutation
2078-Gly or 2088-arginine endows sufficient level of resistance to clethodim at the field rate, and in addition, combinations of
two mutant 1781-Leu alleles, or two different mutant alleles (i.e. 1781-Leu/2027-Cys, 1781-Leu/2041-asparagine), also confer
clethodim resistance. Plants homozygous for the mutant 1781, 2078, or 2088 alleles were found to be clethodim resistant and
cross resistant to a number of other ACCase inhibitor herbicides including clodinafop, diclofop, fluazifop, haloxyfop,
butroxydim, sethoxydim, tralkoxydim, and pinoxaden. We established that the specific mutation, the homo/heterozygous
status of a plant for a specific mutation, and combinations of different resistant alleles plus herbicide rates all are important in
contributing to the overall level of herbicide resistance in genetically diverse, cross-pollinated Lolium species.
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