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对久效磷抗性棉铃虫品系的选育及其乙酰胆碱酯酶的研究

DOI: 10.7685/j.issn.1000-2030.2001.01.012, PP. 47-50

Keywords: 棉铃虫,久效磷,乙酰胆碱酯酶,抗药性

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Abstract:

用久效磷对采集于山东聊城抗性地区的棉铃虫Helicoverpaarmigera(H?bner)进行抗性品系选育。经过10代的室内选育,抗性倍数达21188倍,为选育前的667倍。同时发现筛选后对氰戊菊酯、氯氰菊酯和灭多威的抗性分别下降了813,744和1336倍,对甲基对硫磷和辛硫磷的抗性基本保持不变。这说明久效磷与其他5种被试药剂之间没有明显的交互抗性。还对抗、感棉铃虫体内AChE进行了研究,对久效磷抑制粗酶液的实验表明,抗性品系棉铃虫体内AChE的I50是敏感品系的318倍。酶液纯化使抗、感品系AChE的I50分别下降669和349倍,说明粗提液中存在AChE保护因子,且这种保护因子在抗性品系中更有效。但纯化后,抗、感品系的AChE敏感性之间仍存在166倍的差异。此外,两品系AChE的动力学参数也存在显著差异。由此认为AChE敏感性降低与其它因子共同组成了棉铃虫对久效磷的抗性机制

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