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1 March 2017 A Rare Ile-2041-Thr Mutation in the ACCase Gene Confers Resistance to ACCase-inhibiting Herbicides in Shortawn Foxtail (Alopecurus aequalis)
Wenlei Guo, Lele Zhang, Hengzhi Wang, Qi Li, Weitang Liu, Jinxin Wang
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Abstract

Understanding the mechanism of herbicide resistance is fundamental for designing sustainable weed control strategies and exploiting herbicides rationally. Shortawn foxtail is a problem grass weed infesting several important crops in China. The repeated use of acetyl-CoA carboxylase (ACCase)-inhibiting herbicides has resulted in herbicide resistance in this weed. The ACCase gene of resistant individuals of a shortawn foxtail population (JSLS-1) has an Ile-2041-Thr mutation. F2 generation seeds, originated from the same heterozygous plant, were harvested, and two homozygous mutant (JSLS-1RR) and wild (JSLS-1SS) populations for the Ile-2041-Thr mutation were obtained. In whole plants, the JSLS-1RR population conferred high resistance to fenoxaprop and clodinafop, moderate resistance to haloxyfop, low resistance to pinoxaden, and no obvious resistance to clethodim and sethoxydim, compared with JSLS-1SS and a proven susceptible population (HNXY-1). A derived cleaved amplified polymorphic sequence (dCAPS) marker was developed to rapidly detect the rare Ile-2041-Thr mutation in the shortawn foxtail population. This is the first report of the cross-resistance pattern of Ile-2041-Thr mutation, and the robust dCAPS marker could quickly detect this mutation in shortawn foxtail.

Nomenclature: Clethodim, clodinafop, fenoxaprop, haloxyfop, pinoxaden, sethoxydim, shortawn foxtail, Alopecurus aequalis Sobol.

© Weed Science Society of America, 2017 
Wenlei Guo, Lele Zhang, Hengzhi Wang, Qi Li, Weitang Liu, and Jinxin Wang "A Rare Ile-2041-Thr Mutation in the ACCase Gene Confers Resistance to ACCase-inhibiting Herbicides in Shortawn Foxtail (Alopecurus aequalis)," Weed Science 65(2), 239-246, (1 March 2017). https://doi.org/10.1017/wsc.2016.32
Received: 10 September 2016; Accepted: 1 November 2016; Published: 1 March 2017
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