Frequency of Bt Resistance Alleles in Helicoverpa armigera in the Xinjiang Cotton-Planting Region of China

文献类型： 外文期刊

第一作者： Gao, Yulin

作者： Gao, Yulin;Wu, Kongming;Li, Guoping;Feng, Hongqiang;Wyckhuys, Kris A. C.

作者机构：

关键词： Cry1 Ac toxin: toxin genetic variation;allele frequency;relative average development rate

期刊名称：ENVIRONMENTAL ENTOMOLOGY （ 影响因子：2.377； 五年影响因子：2.298 ）

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收录情况： SCI

摘要： Helicoverpa armigera Hubner (Lepidoptera: Noctuidae) is a key insect pest of cotton in Xinjiang cotton-planting region of northwest China. In this region, cotton is grown on average similar to 1.65 million ha (1.53 similar to 1.80 million ha) annually in largely monoculture agricultural landscapes, similarly to cropping systems in the United States or Australia. Under such cropping regimes, naturally occurring refuges (with non-Bt crops) may be insufficient to prevent H. armigera resistance development to Bt toxins. Therefore, we assessed frequency of alleles conferring resistance to Cry1Ac toxin of F-1 and F-2 offspring of H. armigera isofemale lines from two distinct localities in the region during 2005-2009. More specifically, a total of 224 isofemale lines was collected from Korla County (approximate to 70% Bt cotton adoption) and 402 lines from Shache County (approximate to 5% Bt cotton planting). Subsequent offspring was screened on Cry1Ac artificial diet. From 2005 to 2009, resistance gene frequency in Korla fluctuated between 0.0000 and 0.0040, while being 0.0000-0.0008 in individuals collected from Shache, and there were no significant increases in both counties from 2005 to 2009. Relative average development rates (RADRs) of larvae in F, tests showed significant increases from Korla, but not in Shache. RADR of F-1 larvae is significantly correlated with RADR of F-2 offspring, indicating genetic variation in response to toxin in field H. armigera population. Although the occurrence of Cry1Ac resistance alleles was low in Xinjiang cotton-planting region of China, particular attention should be given to H. armigera resistance development in Korla County.

分类号： Q96

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