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22 October 2019 Target-Site Resistance to Cyhalofop-Butyl in Bearded Sprangletop (Diplachne fusca) from China
Shuzhong Yuan, Yingjie Di, Yueyang Chen, Yongrui Chen, Jingxuan Cai, Wei Deng
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Abstract

Bearded sprangletop [Diplachne fusca (L.) P. Beauv. ex Roem. & Schult. ssp. fascicularis (Lam.) P. M. Peterson & N. Snow] is a noxious annual grass weed of paddy fields, distributed in coastal regions of the Jiangsu and Hebei provinces in China. Cyhalofop-butyl has been widely used to control grass weeds since 2006 in China. Overreliance on cyhalofop-butyl has led to the evolution of resistant weeds. In this study, the resistance level and cyhalofop-butyl resistance mechanisms were investigated in the putative resistant (JSHH) population. The dose–response experiments showed that the JSHH D. fusca population had evolved 8.9-fold resistance to cyhalofop-butyl. Acetyl-CoA carboxylase (ACCase) sequencing revealed a point mutation (GGC to GCC) at amino acid position 2096, resulting in a Gly-2096-Ala substitution in the resistant population. To our knowledge, this is the first case of cyhalofop-butyl resistance in D. fusca and the first report of a target-site mutation conferring resistance to ACCase-inhibiting herbicides in D. fusca. In addition, the resistant D. fusca population (JSHH) with the Gly-2096-Ala mutation was cross-resistant to the aryloxyphenoxypropionate herbicide metamifop, the cyclohexanedione herbicide sethoxydim, and the phenylpyrazolin herbicide pinoxaden.

© Weed Science Society of America, 2019
Shuzhong Yuan, Yingjie Di, Yueyang Chen, Yongrui Chen, Jingxuan Cai, and Wei Deng "Target-Site Resistance to Cyhalofop-Butyl in Bearded Sprangletop (Diplachne fusca) from China," Weed Science 67(5), 534-538, (22 October 2019). https://doi.org/10.1017/wsc.2019.23
Received: 13 March 2019; Accepted: 30 April 2019; Published: 22 October 2019
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KEYWORDS
Acetyl-CoA carboxylase
cross-resistance
target-site resistance
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