Cross-resistance study and biochemical mechanisms of thiamethoxam resistance in B-biotype Bemisia tabaci (Hemiptera: Aleyrodidae)

文献类型： 外文期刊

第一作者： Feng, Yuntao

作者： Feng, Yuntao;Wu, Qingjun;Wang, Shaoli;Chang, Xiaoli;Xie, Wen;Xu, Baoyun;Zhang, Youjun

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关键词： Bemisia tabaci;thiamethoxam;resistance mechanisms;cross-resistance;oxidase

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

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收录情况： SCI

摘要： BACKGROUND: B-biotype Bemisia tabaci (Gennadius) has invaded China over the past two decades. To understand the risks and to determine possible mechanisms of resistance to thiamethoxam in B. tabaci, a resistant strain was selected in the laboratory. Cross-resistance and the biochemical mechanisms of thiamethoxam resistance were investigated in the present study.RESULTS: A 66.3-fold thiamethoxam-resistant B. tabaci strain (TH-R) was established after selection for 36 generations. Compared with the susceptible strain (TH-S), the selected TH-R strain showed obvious cross-resistance to imidacloprid (47.3-fold), acetamiprid (35.8-fold), nitenpyram (9.99-fold), abamectin (5.33-fold) and carbosulfan (4.43-fold). No cross-resistance to fipronil, chlorpyrifos or deltamethrin was seen. Piperonyl butoxide (PBO) and triphenyl phosphate (TPP) exhibited significant synergism on thiamethoxam effects in the TH-R strain (3.14- and 2.37-fold respectively). However, diethyl maleate (DEM) did not act synergistically with thiamethoxam. Biochemical assays showed that cytochrome P450 monooxygenase activities increased 1.21- and 1.68-fold respectively, and carboxylesterase activity increased 2.96-fold in the TH-R strain. However, no difference was observed for glutathione 5-transferase between the two strains.CONCLUSION: B-biotype B. tabaci develops resistance to thiamethoxam. Cytochrome P450 monooxygenase and carboxylesterase appear to be responsible for the resistance. Reasonable resistance management that avoids the use of cross-resistance insecticides may delay the development of resistance to thiamethoxam in this species.

分类号： S4

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