转Bt基因棉和常规棉对烟粉虱生长发育和繁殖的影响

在实验室恒温和大田自然条件下，通过对转Bt基因棉国抗22和常规棉亲本泗棉3号的对比试验研究，探讨两种棉花对烟粉虱生长发育和繁殖的影响。结果表明：28℃恒温条件下，在花铃期棉花上，国抗22上的B型烟粉虱发育历期（从卵到成虫羽化）比常规棉亲本泗棉3号短17．79％、存活率高4．5％、产卵量高39．62％、雌虫寿命长12．14％、内禀增长率rm大20．18％；在苗期棉花上，国抗22上的B型烟粉虱发育历期比泗棉3号短14．14％、雌虫寿命长17．46％、rm大1．47％，存活率和产卵量差异不显著。在大田自然变温条件下，国抗22上烟粉虱发育历期比泗棉3号短13．6％。在同一品种棉花上，饲养在苗期棉花上烟粉虱的发育历期较花铃期棉花长。结果显示，花铃期棉花比苗期棉花更有利于烟粉虱的生长发育和繁殖；与常规棉亲本相比，转Bt基因棉花上烟粉虱的种群扩增速率更快。

Effects of Bt-cotton and non-Bt cotton on development and reproduction of Bemisia tabaci

The effects of two type cottons, Bt-cotton Guokang 22 (GK22) and non-Bt cotton Simian 3 (S3), on the development and reproduction of sweet potato whitefly, Bemisia tabaci (Gennadius), were investigated both under lab constant temperature and field inconstant temperature conditions. The results indicated that the developmental time (from egg to adult) of B. tabaci on the GK 22 cotton at flowering stage shortened by 17.79%, the survivorship, fecundity, the life span of female and r_m increased by 4.5%, 39.62%, 12.14% and 20.18%, respectively, compared with S3 cotton. At the seedling stage, the developmental time (from egg to adult) of B. tabaci increased by 14.14%, the life of female and r_m increased by 17.46% and 1.47%, respectively. And no significant difference was detected in survivorship and fecundity of the whiteflies on two types of cottons. Moreover, under field inconstant temperature conditions, the developmental time of B. tabaci on Goukang No.22 was 13.6% shorter than that on S3 cotton. The cotton plant at flowering stage is more beneficial to the development and reproduction of B. tabaci than that cotton plants at seedling stage. Compare with non-Bt transgenic cotton, Bt transgenic cotton CD10] was more advantageous to the development and reproduction of sweet potato whitefly, B.tabaci.