寄主植物对棉蚜酯酶的影响

EFFECT OF HOST PLANT ON ESTERASE ACTIVITY IN COTTON APHID

通过生物测定和生化分析研究了取食不同寄主植物棉蚜种群对有机磷杀虫剂的敏感性、α-乙酸萘酯（α-NA）酯酶比活力及久效磷对α-NA酯酶活力的抑制。结果表明，取食花椒、木槿、石榴和棉花的棉蚜对久效磷的耐药性存在一定的差异，取食棉花的棉蚜α-NA酯酶的比活力是取食其它寄主植物棉蚜的1．30～2．39倍，棉蚜对有机磷杀虫剂的抗性与α-NA酯酶活力的增高有关。同时，取食寄主植物不同，棉蚜对有机磷杀虫剂的敏感性及棉蚜酯酶的比活力也不同，植物次生物质可能是影响昆虫耐药性及解毒酶活力的重要因素之一。

By applying bioassay and biochemical analyses, the susceptibility to insecticide of four cotton aphid Aphis gossypii （Glover）populations feeding on Chinese prickly ash, hibiscus, pomegranate and cotton, the activities of their α-naphthylacetate （α-NA） esterase and the inhibition by monocrotophos ofα-NA esterase activity were tested. The results showed that the cotton aphid populations collected on four host plants had different sensibility to insecticide. The specific activity of α-NA esterase of A. gossypii on cotton was 1.30-fold to 2.39-fold compared with the other aphids on various plants. The results indicated that the resistance of A. gossypii to organophosphate insecticides might be correlated with the increased activities of α-NA esterase. Furthermore, the sensibilities to insecticide and the activities of α-NA esterase of cotton aphids varied with the host plants that they feed on. It is suggested that plant allelochemicals may play an important role in inducing the changes of sensibility and insect detoxifying enzyme.