转Bt基因棉对斜纹夜蛾种群增长的影响

Effects of the Transgenic Bt Cotton on the Increase in Population of Podoptera litura Fabricius

田间调查结果显示,斜纹夜蛾(PodopteralituraFabricius)对转Bt基因抗虫棉科棉1号叶片、花和蕾的为害率与对常规棉渝棉1号的为害率相比均无显著差异,但科棉1号棉田百株虫量最高达928头,显著高于渝棉1号百株虫量。实验种群生命表研究结果表明,斜纹夜蛾取食棉花后的各虫态发育历期和存活率等两品种间无明显差异,取食科棉1号棉花的斜纹夜蛾种群趋势指数略大于取食渝棉1号棉花的斜纹夜蛾种群。说明转Bt基因棉科棉1号对斜纹夜蛾并无抗性。

Results of field investigation during two years showed there was no significant difference between transgenic Bt cotton Kemian 1 and non-transgenic Bt cotton Yumian 1 in the rate of damage to leaves, flowers and buds due to Podoptera litura. However, the maximum larva per 100 plants on Kemian 1 came to 928, which was higher than that on Yumian 1 obviously. Results of population life table showed there was no difference in the development duration and survival rate of P. litura of the two cotton varieties, but there was much more of the population growing trend index in Kemian 1 than in Yumian 1. All in all, the transgenic Bt cotton Kemian 1 had no resistance to P. litura.