摘要
1997～1998年在河北省廊坊市和1998年在河南省新乡市分别研究了转CryIA Bt抗虫基因棉花GK-2、GK-5和GK-12对棉铃虫的抗性水平。研究结果表明,GK-2和GK-12在整个生育期对棉铃虫皆保持极高的抗性,在对照普通棉花品种棉铃虫高峰期百株幼虫2代44～138头,3代113～138头和4代144头密度下,对棉铃虫的控制效果分别达88.71％～95.45％、92.75％～97.65％和93.33％。对2～3代棉铃虫为害棉花的保蕾率达94.47％～99.09％,皮棉增产率97.05％～393.77％。对转Bt抗虫基因棉田的调查表明,棉铃虫1龄幼虫为害幼蕾,2龄幼虫主要取食棉蕾(41.94％)和花(45.16％),3龄后逐渐以棉铃为主要为害器官,其对Bt棉和常规棉花的取食特点无明显的区别。
The resistance levels to cotton bollworm Helicoverpa armigera (Hubner) of Bt transgenic cotton GK series developed by the Biotechnology Research Center, CAAS were evaluated in Lang-fang of Hebei Province from 1997 to 1998 and in Xinxiang County, Henan Province in 1998. The results showed that GK-2 and GK-12 strains possessed high resistance to cotton bollworm in the whole growing season. The control efficiencies to the second, third and fourth generation cotton boll-worms were up to 88.71% - 95.45% , 92.75% - 97.65% and 93.33% , in comparison with the larval numbers per hundred plants of corresponding non-transgenic cotton varieties: were 44 -138, 113 - 138 and 144, respectively. The damage rates of the second and third generation boll-worms to cotton squares were controlled under 6.53 % , which resulted in 97.05 % - 393.77 % yield increases. The investigation in Bt cotton field also indicated that the major organs damaged by the first instar and second instar larvae were squares, and squares (41. 94 % ) and flowers (45.16%), as they got to the third instar, most of them mainly fed cotton bolls. It was indicated that there was no significant difference between feeding behavior of cotton bollworm to Bt cotton and common cotton.
出处
《植物保护学报》
CAS
CSCD
北大核心
2000年第4期317-321,共5页
Journal of Plant Protection
基金
国家科委863计划资助(Z17-02-06)
关键词
CK
BT棉
棉铃虫
种群密度
抗虫性
GK Bt transgenic cotton, Helicoverpa armigera, population dynamics, cotton resis-tance
