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文中综述了昆虫对苏云金杆菌 ( Bt)毒素产生抗性的生化遗传机理及抗性的遗传及交叉抗性情况。昆虫对 Bt毒素的抗性可能在 6个环节发生 ,其中与毒素特异结合的受体上结合位点的改变及毒素水解过程的变化是抗性产生的两个主要环节。从现有研究结果来看 ,实验室及田间抗性昆虫品系对 Bt毒素产生的抗性主要与昆虫中肠上皮细胞膜上 Bt毒素特异结合受体的变化有关。深入研究昆虫对 Bt毒素的抗性机理 ,将有助于建立抗性的早期监测技术、抗性治理措施 ,实现无公害 Bt农药及转 Bt基因作物的持续利用
The biochemical and genetic mechanisms of resistance to insecticides to Bt toxin and their genetic and cross resistance were reviewed. Insect resistance to Bt toxin may occur in six aspects, of which the toxin binding site specific binding changes and toxin hydrolysis process changes are the two main aspects of resistance. From the existing research results, the resistance of Bt toxin produced by laboratory and field resistant insect strains is mainly related to the changes of Bt toxin-specific binding receptors on insect midgut epithelial membrane. In-depth study of insect resistance mechanisms to Bt toxins will help to establish early monitoring techniques of resistance, resistance control measures, and sustainable utilization of pollution-free Bt pesticides and transgenic Bt crops