数字农科院2.0

Investigation of resistance mechanism to fomesafen in Amaranthus retroflexus L.

文献类型： 外文期刊

作者： Zhaofeng Huang; Hailan Cui; Chunyu Wang; Tong Wu; Chaoxian Zhang; Hongjuan Huang; Shouhui Wei

作者机构：

关键词： Amaranthus Retroflexus L.; Protoporphyrinogen Oxidase; Herbicide Resistance; Fomesafen

期刊名称： PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY

ISSN： 0048-3575

年卷期： 2020 年 165 卷

页码：

收录情况： JCR（2021版）

摘要： Amaranthus retroflexus L. is one of the most troublesome weeds in autumn-crop fields in Northeast China. In recent years, field applications of fomesafen have failed to control an A. retroflexus population in Heilongjiang Province, China. Therefore, in this study, experiments were conducted to determine the resistance of A. retroflexus to fomesafen and investigate the molecular basis of herbicide resistance. Whole-plant dose-response experiments showed that the resistant (R) population exhibited 41.8-fold resistance to fomesafen compared with the susceptible (S) population. Target-gene sequence analysis revealed an Arg-128-Gly substitution in the protoporphyrinogen oxidase (PPO) in the R population. The response of PPO2 transgenic Arabidopsis thaliana to fomesafen demonstrated that the Arg-128-Gly substitution conferred high resistance to fomesafen. Cross- and multiple-resistance analyses indicated that the R population was cross-resistant to lactofen and carfentrazone-ethyl but was sensitive to imazethapyr, thifensulfuron-methyl, atrazine, and glyphosate. This study indicated that the Arg-128-Gly substitution is the main reason for A. retroflexus resistance to fomesafen. To our knowledge, this is the first report of a target-site based mechanism for the resistance to a PPO-inhibiting herbicide in A. retroflexus.

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