Molecular basis of cross-resistance to acetohydroxy acid synthase-inhibiting herbicides in Sagittaria trifolia L.

文献类型： 外文期刊

第一作者： Sun, Zhonghua

作者： Sun, Zhonghua;Li, Xiuwei;Wang, Kai;Zhao, Ping;Li, Jing;Wang, Weijing;Ahmed, Maqsood;Zhu, He;Ji, Mingshan;Shafi, Jamil;Zhao, Bochui;Fu, Danni

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关键词： Acetohydroxy acid synthase; Resistance mutation; Cross-resistance, BCAAs, Sagittaria trifolia L

期刊名称：PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY （ 影响因子：2.751； 五年影响因子：3.402 ）

ISSN： 0048-3575

年卷期： 2021 年 173 卷

页码：

收录情况： SCI

摘要： Acetohydroxy acid synthase (AHAS)-inhibiting herbicides are one of the most commonly used herbicides for controlling the growth of Sagittaria trifolia L. in paddy fields in Northeastern China. In this study, we collected five suspected resistant populations of S. trifolia (R1-R5) from three different provinces of Northeastern China. The results of whole-plant bioassays revealed that those populations showed high level of resistance to bensulfuron-methyl with resistance index (GR(50) R/S) ranging from 39.90 to 88.50. The results of AHAS-activity assays were consistent with the results of the whole-plant bioassays. The AHAS gene analysis showed that R2 and R3 populations contained Pro-197-Leu mutations that were highly resistant to penoxsulam; R1 and R4 populations contained Pro-197-Ser mutations that were highly resistant to bispyribac-sodium; R5 population contained Trp-574-Leu mutation that showed high resistance to IMI, PT, PTB and SU herbicides. The AHAS with resistance mutations showed less sensitivity to feedback inhibition by BCAAs and R genotypes had increased free BCAAs

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