家蚕对溴虫腈的耐受性及与体内细胞色素P450和b5含量的关联性

Acta Sericologica Sinica(2017)

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Abstract
溴虫腈是一种广泛应用并明确对家蚕毒性较小的农用杀虫剂.为了探讨家蚕对溴虫腈的耐受性产生机制,采用室内生物测定方法检测溴虫腈对家蚕耐受性品系QBA和敏感品系p50的2~5龄幼虫的毒性,并同时测定幼虫体内细胞色素P450和b5的含量.结果表明:随着2个家蚕品系幼虫的发育龄期增加,幼虫对溴虫腈的耐受性也增强,并且溴虫腈对同一龄期幼虫的LC50值是耐受性品系QBA高于敏感品系p50;幼虫体内的细胞色素P450和b5含量也是随着幼虫发育龄期增加,但同一龄期耐受性品系QBA幼虫的细胞色素P450含量高于敏感品系p50,而且QBA的幼虫随着发育龄期对溴虫腈的耐受性增强与细胞色素P450含量的增加具有极显著的正相关性(P<0.01),与细胞色素b5含量的增加则无相关性.初步推测不同家蚕品系对溴虫腈的耐受性与体内细胞色素P450含量可能有一定关联.
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