Detoxification enzymes of Bemisia tabaci B and Q: biochemical characteristics and gene expression profiles

文献类型： 外文期刊

第一作者： Guo, Litao

作者： Guo, Litao;Xie, Wen;Wang, Shaoli;Wu, Qingjun;Li, Rumei;Yang, Nina;Yang, Xin;Pan, Huipeng;Zhang, Youjun

作者机构：

关键词： Bemisia tabaci;detoxification enzymes;quantitative real-time PCR analysis;cytochrome-P450-dependent monooxygenase;carboxylesterase;glutathione S-transferase

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: The sweetpotato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), is one of the most invasive and destructive pests of field crops worldwide. The sibling species B and Q are the two most damaging members of the B. tabaci species complex. That Q is more resistant than B to many insecticides has been well documented. Over the last decade, Q has gradually displaced B and has become the dominant for_m of B. tabaci in field agricultural systems in most parts of China. To help understand the differences in insecticide resistance, the activities and gene expression profiles of detoxification enzymes in 8. tabaci B and Q were investigated. RESULTS: The activity of P450 towards 7-ethoxycoumarin was significantly higher (1.46-fold higher) in Q than in B. The expression of 43 of 65 P450 genes was higher (>1-fold) in Q than in B, and expression for eight P450 genes was more than 50-fold greater in Q than in B. The increased expression of selected P450 genes in Q relative to B was confir_med with two other B strains and two other Q strains. On the other hand, carboxylesterase (CarE) activity was significantly lower (0.71-fold lower) in Q than in B; the K_m value of CarE was significantly lower in B than in Q, but the opposite was true for the V_(max) value of CarE. Glutathione S-transferase activity and values of K_m and l/_(max) did not differ between B and Q.

分类号： S4

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