转Cry1Ac+Cry2Ab基因棉对棉蚜生命表参数及种群动态的影响

Effects of transgenic Cry1Ac and Cry2Ab cotton on life table parameters and population dynamics of the cotton aphid

为研究新型转Cry1Ac+Cry2Ab基因棉对棉蚜Aphis gossypii Glover生命表参数及种群动态的影响。2010—2011年以常规棉中棉所49为对照,对新型转Cry1Ac+Cry2Ab基因棉在室内进行了生物测定和田间进行了系统的调查。结果表明,和常规棉相比,转Cry1Ac+Cry2Ab基因棉花上棉蚜的净增值率降低81.69%,差异达显著水平;内禀增长率和周限增长率分别降低65.00%和13.01%,但差异不显著;平均世代周期和种群加倍时间分别增加5.54%和154.19%,后者差异达显著水平。和常规棉相比,2010年转Cry1Ac+Cry2Ab基因棉花百株苗蚜、伏蚜和秋蚜的数量分别降低10.79%、37.18%和17.49%,差异均未达显著水平;2011年转Cry1Ac+Cry2Ab基因棉花百株苗蚜的数量增加2.03%,伏蚜和秋蚜的数量分别降低37.41%和64.03%,差异均未达显著水平。

The effects of transgenic Cry1Ac and Cry2Ab cotton on the life table parameters and population dynamics of the cotton aphid were studied under laboratory conditions and in cotton fields in 2010 and 2011. The results show that, compared with conventional CCRI 49 cotton, net reproductive rates, intrinsic growth rates and the finite rate of increase decreased by 81. 69%, 65.00% and 13.01% respectively; the decrease in net reproductive rate being statistically significant. The average generation cycle and population doubling time increased by 5.54% and 154.19% , respectively, the latter being statistically significant. Compared to conventional cotton, the numbers of seedling aphids, summer aphids and autumn aphids per 100 Cry1Ac -Cry2Ab plants were 10.79% , 37.18% and 17.49% lower respectively in 2010, but these differences were not significant. Numbers of seedling aphids per 100 Cry1Ac - Cry2Ab plants in cotton fields increased by 2. 03% in 2011, and numbers of summer aphids and autumn aphids per 100 Cry1Ac - Cry2Ab plants decreased by 37.41% and 64.03% respectively in 2011 but none of these differences were significant.