Mechanism of Resistance to Pyroxsulam in Multiple-Resistant Alopecurus myosuroides from China

文献类型： 外文期刊

第一作者： Lan, Yuning

作者： Lan, Yuning;Sun, Ying;Liu, Zhen;Wei, Shouhui;Huang, Hongjuan;Cao, Yi;Li, Wenyu;Huang, Zhaofeng;Sun, Ying

作者机构：

关键词： Alopecurus myosuroides; pyroxsulam; ALS; mutation; target-site resistance; metabolic resistance

期刊名称：PLANTS-BASEL （ 影响因子：4.658； 五年影响因子：4.827 ）

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年卷期： 2022 年 11 卷 13 期

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收录情况： SCI

摘要： Black grass (Alopecurus myosuroides Huds.) is a highly competitive weed in winter wheat fields of China. Due to repeated use of acetolactate synthase (ALS) inhibitors, many A. myosuroides populations have evolved resistance to pyroxsulam in some wheat fields. Research was conducted to determine the molecular basis of herbicide resistance in the AH93 A. myosuroides population. Wholeplant dose-response assay confirmed that the AH93 population was resistant to pyroxsulam with a resistance index of 4.2. Cross- and multiple-resistance assays indicated that the AH93 population was cross-resistant to mesosulfuron-methyl and multiple-resistant to pinoxaden. Sequencing of the ALS and ACCase gene revealed that there was no target-site mutation in ALS, but Trp-2027-Cys and Cys2088-Arg amino acid mutations in ACCase in the AH93 population. A malathion pretreatment study indicated that the AH93 population might have cytochrome P450-mediated herbicide metabolic resistance. This is the first report of pyroxsulam resistance in a multiple-resistant A. myosuroides population in China, and the Cys-2088-Arg mutation is the first reported case of an ACCase mutant conferring herbicide resistance in A. myosuroides.

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