Characterization of Asian Corn Borer Resistance to Bt Toxin Cry1Ie

文献类型： 外文期刊

第一作者： Wang, Yueqin

作者： Wang, Yueqin;Yang, Jing;Quan, Yudong;Wang, Zhenying;He, Kanglai;Wang, Yueqin;Cai, Wanzhi

作者机构：

关键词： Ostrinia furnacalis; Bacillus thuringiensis; inheritance; cross-resistance; resistance management

期刊名称：TOXINS （ 影响因子：5.075； 五年影响因子：5.305 ）

ISSN：

年卷期： 2017 年 9 卷 6 期

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收录情况： SCI

摘要： A strain of the Asian corn borer (ACB), Ostrinia furnacalis (Guenee), has evolved >800-fold resistance to Cry1Ie (ACB-IeR) after 49 generations of selection. The inheritance pattern of resistance to Cry1Ie in ACB-IeR strain and its cross-resistance to other Bt toxins were determined through bioassay by exposing neonates from genetic-crosses to toxins incorporated into the diet. The response of progenies from reciprocal F-1 crosses were similar (LC(50)s: 76.07 vs. 74.32 mu g/g), which suggested the resistance was autosomal. The effective dominance (h) decreased as concentration of Cry1Ie increased. h was nearly recessive or incompletely recessive on Cry1Ie maize leaf tissue (h = 0.02), but nearly dominant or incompletely dominant (h = 0.98) on Cry1Ie maize silk. Bioassay of the backcross suggested that the resistance was controlled by more than one locus. In addition, the resistant strain did not perform cross-resistance to Cry1Ab (0.8-fold), Cry1Ac (0.8-fold), Cry1F (0.9-fold), and Cry1Ah (1.0-fold). The present study not only offers the manifestation for resistance management, but also recommends that Cry1Ie will be an appropriate candidate for expression with Cry1Ab, Cry1Ac, Cry1F, or Cry1Ah for the development of Bt maize.

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