Department of Entomology, University of Hawaii, Honolulu, Hawaii 96822, and Department of Entomology, Auburn University, Auburn, Alabama 36849.
Appl Environ Microbiol. 1993 May;59(5):1332-5. doi: 10.1128/aem.59.5.1332-1335.1993.
Repeated exposure in the field followed by laboratory selection produced 1,800- to >6,800-fold resistance to formulations of Bacillus thuringiensis subsp. kurstaki in larvae of the diamondback moth, Plutella xylostella. Four toxins from B. thuringiensis subsp. kurstaki [CryIA(a), CryIA(b), CryIA(c), and CryIIA] caused significantly less mortality in resistant larvae than in susceptible larvae. Resistance to B. thuringiensis subsp. kurstaki formulations and toxins did not affect the response to CryIC toxin from B. thuringiensis subsp. aizawai. Larvae resistant to B. thuringiensis subsp. kurstaki showed threefold cross-resistance to formulations of B. thuringiensis subsp. aizawai containing CryIC and CryIA toxins. This minimal cross-resistance may be caused by resistance to CryIA toxins shared by B. thuringiensis subsp. kurstaki and B. thuringiensis subsp. aizawai.
经田间重复暴露和实验室选择,小菜蛾幼虫对苏云金芽孢杆菌亚种 kurstaki 的制剂产生了 1800 至 >6800 倍的抗性。苏云金芽孢杆菌亚种 kurstaki 的四种毒素[CryIA(a)、CryIA(b)、CryIA(c)和 CryIIA]在抗性幼虫中的致死率明显低于敏感幼虫。对苏云金芽孢杆菌亚种 kurstaki 制剂和毒素的抗性并不影响对苏云金芽孢杆菌亚种 aizawai 的 CryIC 毒素的反应。对苏云金芽孢杆菌亚种 kurstaki 具有抗性的幼虫对含有 CryIC 和 CryIA 毒素的苏云金芽孢杆菌亚种 aizawai 制剂表现出三倍的交叉抗性。这种最小的交叉抗性可能是由于对苏云金芽孢杆菌亚种 kurstaki 和苏云金芽孢杆菌亚种 aizawai 共有的 CryIA 毒素的抗性所致。