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Mutation in the Cadherin Gene Is a Key Factor for Pink Bollworm Resistance to Bt Cotton in China

文献类型： 外文期刊

作者： Wang, Ling 1 ; Xu, Dong 1 ; Huang, Yunxin 2 ; Zhou, Huazhong 3 ; Liu, Weiguo 3 ; Cong, Shengbo 1 ; Wang, Jintao 1 ; Li, Wenjing 1 ; Wan, Peng 1 ;

作者机构： 1.Hubei Acad Agr Sci, Key Lab Integrated Pest Management Crops Cent Chi, Inst Plant Protect & Soil Fertilizer, Minist Agr & Rural Affairs,Hubei Key Lab Crop Dis, Wuhan 430064, Peoples R China

2.Hubei Univ, Sch Resource & Environm Sci, Wuhan 430062, Peoples R China

3.Gen Stn Plant Protect, Wuhan 430070, Peoples R China

关键词： pink bollworm; Bt resistance; cadherin; F2 screening

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

ISSN：

年卷期： 2022 年 14 卷 1 期

页码：

收录情况： SCI

摘要： Transgenic crops producing Bacillus thuringiensis (Bt) toxins are widely planted for insect control, but their efficacy may decrease as insects evolve resistance. Understanding the genetic basis of insect resistance is essential for developing an integrated strategy of resistance management. To understand the genetic basis of resistance in pink bollworm (Pectinophora gossypiella) to Bt cotton in the Yangtze River Valley of China, we conducted an F2 screening for alleles associated with resistance to the Bt (Cry1Ac) protein for the first time. A total of 145 valid single-paired lines were screened, among which seven lines were found to carry resistance alleles. All field parents in those seven lines carried recessive resistance alleles at the cadherin locus, including three known alleles, r1, r13 and r15, and two novel alleles, r19 and r20. The overall frequency of resistance alleles in 145 lines was 0.0241 (95% CI: 0.0106-0.0512). These results demonstrated that resistance was rare and that recessive mutation in the cadherin gene was the primary mechanism of pink bollworm resistance to Bt cotton in the Yangtze River Valley of China, which will provide a scientific basis for implementing targeted resistance management statics of pink bollworm in this region.

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