Characterisation of imidacloprid resistance in the bird cherry-oat aphid, Rhopalosiphum padi, a serious pest on wheat crops

文献类型： 外文期刊

第一作者： Wang, Kang

作者： Wang, Kang;Huang, Yanna;Yang, Zhuolin;Su, Sha;Chen, Maohua;Zhang, Meng

作者机构：

关键词： Rhopalosiphum padi; fitness; cross-resistance; P450; nicotinic acetylcholine receptor (nAChR)

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）

ISSN： 1526-498X

年卷期： 2018 年 74 卷 6 期

页码：

收录情况： SCI

摘要： BACKGROUNDRhopalosiphum padi is a destructive insect pest of wheat worldwide. Studies have shown that R. padi has developed resistance to different insecticides, including imidacloprid. We studied the mechanisms conferring resistance to imidacloprid at the biochemical and molecular levels. RESULTSAn R. padi imidacloprid-resistant (IM-R) strain and a susceptible (SS) strain were established. Fitness analysis using life-tables showed that the IM-R strain had obvious disadvantages in several parameters, indicating reduced fitness. Profiles of cross-resistance of IM-R and SS to seven insecticides were detected. Both synergistic and enzyme activity data suggested that P450 plays a role in resistance. Furthermore, the mRNA expression levels of cytochrome P450 (CYP) genes CYP6CY3-1 and CYP6CY3-2 were significantly increased in the IM-R strain. No target-site mutation within the nicotinic acetylcholine receptor (nAChR) subunits was detected in the IM-R strain. Interestingly, the expression levels of the nAChR 1, 2, 3, 7-2, and 1 subunit genes were significantly decreased, suggesting that down-regulation of these subunits may be involved in resistance. CONCLUSIONMultiple mechanisms confer imidacloprid resistance in R. padi. (c) 2017 Society of Chemical Industry

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