Evolution of Asian Corn Borer Resistance to Bt Toxins Used Singly or in Pairs

文献类型： 外文期刊

第一作者： Wang, Yueqin

作者： Wang, Yueqin;Quan, Yudong;Yang, Jing;Shu, Changlong;Wang, Zhenying;Zhang, Jie;He, Kanglai;Gatehouse, Angharad M. R.;Tabashnik, Bruce E.

作者机构：

关键词： Bacillus thuringiensis; cry toxin; pyramid strategy; resistance; Ostrinia furnacalis

期刊名称：TOXINS （ 影响因子：4.546； 五年影响因子：4.8 ）

ISSN：

年卷期： 2019 年 11 卷 8 期

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收录情况： SCI

摘要： Transgenic crops producing insecticidal proteins from Bacillus thuringiensis (Bt) have revolutionized pest control, but the benefits of this approach have been reduced by the evolution of resistance in pests. The widely adopted 'pyramid strategy' for delaying resistance entails transgenic crops producing two or more distinct toxins that kill the same pest. The limited experimental evidence supporting this strategy comes primarily from a model system under ideal conditions. Here we tested the pyramid strategy under nearly worst-case conditions, including some cross-resistance between the toxins in the pyramid. In a laboratory selection experiment with an artificial diet, we used Bt toxins Cry1Ab, Cry1F, and Cry1Ie singly or in pairs against Ostrinia furnacalis, one of the most destructive pests of corn in Asia. Under the conditions evaluated, pairs of toxins did not consistently delay the evolution of resistance relative to single toxins.

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