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转cry1Ac玉米对亚洲玉米螟的抗性评价

, PP. 395-400

Keywords: 转cry1Ac玉米,寄主植物抗虫性,亚洲玉米螟,酶联免疫法

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Abstract:

目标性状的有效性评价是转Bt基因抗虫玉米研发和安全性评价研究的重要内容之一。采用酶联免疫吸附剂测定(ELISA)、室内生测和田间人工接虫鉴定研究了转cry1Ac玉米纯合群体BT-X和分离群体BT-38、BT-181、BT-43、BT-105等转化事件Cry1Ac蛋白的表达量以及对亚洲玉米螟Ostriniafurnacalis(Guenée)的室内杀虫和田间抗虫效果。转cry1Ac玉米鲜组织中Cry1Ac蛋白含量在44.07~438.00ng/g之间,不同转化事件及不同组织之间差异显著,其中BT-X鲜花丝中Bt蛋白表达量显著低于未展开心叶。室内生测试验中除BT-43与对照没有显著差异外,取食其它转基因玉米心叶的亚洲玉米螟初孵幼虫6或7天的存活率为0~15.3%,显著低于非转基因对照;取食夏播BT-X鲜花丝6天的幼虫存活率为62.5%,显著低于Bt11及非转基因对照。田间心叶期接虫鉴定显示BT-X高抗亚洲玉米螟。说明转cry1Ac玉米BT-X、BT-181、BT-38和BT-105对亚洲玉米螟有很高的杀虫作用,BT-X田间抗虫效果良好。

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