摘要： 2002年在河北省南皮县, 以亲本常规棉(石远321)棉田为对照, 对转CryC1Ac+CpTI基因的双价抗虫棉(SGK321)棉田的节肢动物群落、害虫及其天敌的种群动态进行了系统研究, 结果发现: SGK321棉田的功能团种类与常规棉田基本相同, 两者节肢动物多样性差异并不显著, 物种多样性指数分别为0.975和0.967。但SGK321棉田节肢动物总数量比常规棉田降低了53.9%, 其主要原因是基位物种数量显著减少; SGK321棉田与其亲本对照棉田的害虫和捕食性天敌的种类基本相同, 但数量差异较大。SGK321对靶标害虫具有很好的抗性, 与对照棉田相比, 棉铃虫种群数量减少了89.5%。SGK321对棉蚜、棉粉虱、绿盲蝽、小绿叶蝉等非标靶害虫的发生也具有一定抑制作用, 其种群数量比对照棉田分别降低了64.5%, 15.6%, 21.8%和33.7%。SGK321棉田龟纹瓢虫和中华草蛉的种群数量分别比对照增加34.0%和9.1%, 但异色瓢虫、小花蝽、异须盲蝽、蚜茧蜂和蜘蛛类等其他主要天敌的数量则分别降低28.6%, 6.5%, 43.1%, 44.7%和14.0%。由此表明: 双价抗虫棉SGK321在对棉铃虫具有较好抗性的同时, 对棉田主要非标靶害虫也都有一定抑制作用, 对某些天敌种类的种群存在不利影响, 但对棉田节肢动物多样性动态没有显著影响。

关键词: 转Cry1Ac+CpTI基因棉, 害虫, 天敌, 节肢动物群落, 多样性

Abstract: Structure and seasonal dynamics of arthropods in tranagenic cotton(cv. SGK321, with inserted genes of CrylAc and cpTl) and population dynamics of pests and natural enemies were studied in Nanpi County, Hebei Province in 2002, with the non-tranagenic parental cotton(Shiyuan321)as control. It showed that the composition of pest and predatory species was similar between the plots of SGK321 and the control, but the accumulated numbers of each species were deferent. SGK321 had good control not only to cotton bollwonn(89.5%), but also some non-target pests, such as cotton aphid Aphis gossypii, grean leaf bug Lygus lucorum, tobacco whitefly Bemisia tabaci and green leafhopper Enpoxzsca fLawescens, and their accumulated numbers decreased by 64.5%, 21.8%, 15.6% and 33.7%, respectively. For the dominant natural enemy species, the accumulated numbers of Propylaea japonaca and Chryscpa sinaca increased by 34.0% and 9.1%, respectively; but those of Harmonia aeyridas, Orius manzetus, Canqagylomma diwersicornis, Lysiphlebia japonicus and spiders decreased by 28.6%, 6.5%, 43.1%, 44.7% and 14.0%, respectively. Arthropod diversity in SGK321 was similar to that in Shiyuan321, and the Shannon-Weiner diversity index was 0.975 and 0.967, respectively. Whereas the total number of arthropods in SGK321 decreased by 53.9%, which was mainly caused by the reduction of basal species. It indicated that SGK321 had good control not only to cotton bolkvorm, but also to some non-target pests. SGK321 had some negative effects on certain natural enemy populations. But it had no significant impacts on the arthropod diversity in the fields.

Key words: Transgenic CrylAc+ CpTI cotton, Pest, Natural enemy, Arthorpod community, Diversity

中图分类号: 

• Q968.1