新疆棉区转Bt基因棉对棉铃虫生物学的影响

棉铃虫Helicoverpaarmigera高龄幼虫取食转Bt基因棉花组织后 ,化蛹率、羽化率、蛹重、体长均有显著下降 ,在转Bt基因棉花上棉铃虫的取食行为也受到较大的影响 ,表现为取食次数明显减少、吐丝下垂次数明显增加 ;无论是转Bt基因棉花还是常规棉花 ,棉铃虫 3龄幼虫主要分布于繁殖器官上 ,在转Bt基因棉花各繁殖器官上的分布概率为 :花 >棉铃 >棉蕾 ,常规棉花上分布概率为 :棉蕾 >棉铃 >花 ;棉铃虫高龄幼虫取食转Bt基因棉花各组织 ,成虫羽化后产卵量、卵孵化率均有明显下降 ;在较低的棉铃虫虫口密度下 ,转Bt基因棉花对棉铃虫有一定的产卵排趋性。

Effects of transgenic Bt cotton on the biology of cotton bollworms in Xinjiang

The effects of transgenic Bt cotton in Xinjiang on cotton bollworms’ biology were studied. Key results are: (1) after eating Bt cotton larval pupation rate, eclosion rate, pupae weight and body length obviously decreased; (2) cotton bollworms’ feeding behavior on Bt cotton, such as feeding duration, was obviously reduced while spin drooping time was obviously increased relative to that on non-Bt cotton; (3) except for third instar larvae which were mainly distributed in plant breeding organs in both non-Bt and Bt cotton crops, preferred micro-habitats of cotton bollworms in transgenic Bt cotton were, in order of probability of bollworm occurrence: cotton blossom> cotton boll>cotton bud, compared to in non-Bt cotton: cotton bud>cotton boll> cotton blossom; (4) after older larvae ate the organs of transgenic Bt cotton,imago's ovipositing quantity and hatching rate obviously decreased. At low cotton bollworms density transgenic Bt cotton negatively influenced the oviposition rate.