Cross-resistance studies of Cry1Ac-resistant strains of Helicoverpa armigera (Lepidoptera : Noctuidae) to Cry2Ab

文献类型： 外文期刊

第一作者： Luo, Shudong

作者： Luo, Shudong;Wu, Kongming;Tian, Yan;Liang, Gemei;Feng, Xue;Zhang, Jie;Guo, Yuyuan

作者机构：

关键词： helicoverpa armigera;Cry1Ac;Cry2Ab;cross-resistance;binding;BORDER MEMBRANE-VESICLES;BOLLWORM PECTINOPHORA-GOSSYPIELLA;THURINGIENSIS DELTA-ENDOTOXIN;COTTONS EXPRESSING ONE;BACILLUS-THURINGIENSIS;PINK-BOLLWORM;HELIOTHIS-VIRESCENS;INSECT RESISTANCE;TRANSGENIC COTTON;LARVAL MIDGUT

期刊名称：JOURNAL OF ECONOMIC ENTOMOLOGY （ 影响因子：2.381； 五年影响因子：2.568 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Bioassays and binding tests between Cry toxins (Cry1Aa, Cry1Ab, Cry1Ac, and Cry2Ab) and brush-border membrane vesicles (BBMVs) from larvae of a Bacillus thurningiensis (Bt) -susceptible (96S) and two Cry1Ac-resistant strains (BtR and LFR10) were conducted for investigating cross-resistance of Cry1Ac-resistant strains to Cry2Ab in Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae). The resistance ratio (RR) values of the BtR and LFR10 strains to Cry1Ac and Cry2Ab were 2,971- and 1.1-fold and 253- and 1.0-fold, respectively, indicating that there was no cross-resistance to Cry2Ab. The binding experiments between Cry toxins and BBMVs from BtR, LFR10 and 96S larvae showed that all of the toxins could bind with these BBMVs, but the Cry2Ab could not displace I-125 labeled Cry1Ac and Cry1Ab. The same results were observed in reciprocal binding tests, demonstrating that Cry1A and Cry2Ab had different binding sites in H. armigera and providing a potential mechanism for the lack of cross-resistance between Cry1A and Cry2Ab toxins. These results suggest that the transgenic cotton, Gossypium hirsutum L., expressing Cry1Ac and Cry2Ab genes may be deployed for management of Cry1Ac resistant H. armigera.

分类号： Q969.9

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