转基因741杨林中靶标害虫实验种群生命表研究

Life Table of Population of Target Insect in the Stands of Transgenic Hybrid Poplar 741

通过在转基因741杨林中,对靶标害虫舞毒蛾实验种群生命表的比较研究,证明转基因741杨林中舞毒蛾世代存活率与对照相比显著降低,种群趋势指数降低了82%～92%,表明转基因杨可以减少靶标害虫的自然种群数量。经存活曲线分析得知舞毒蛾种群的个体死亡主要发生在幼龄幼虫期,特别是对1,2龄幼虫的致死能力更为明显。经过对转基因741杨林中舞毒蛾各死亡因子的致死力比较分析可知:由毒蛋白直接引起的食物和环境共同作用、病菌致死以及间接引起的化蛹死亡率升高的最为明显,转基因741杨林中舞毒蛾各龄期幼虫寄生性天敌的寄生率较之未转基因林下降。

Life tables of population of Lymantria dispar were established when the pest was separately fed with Transgenic hybrid poplar 741 [ Populus alba × （ P. davidiana ＋ P. simonii ） ] × P. tomentosa and with the untransgenic control. The result showed that the indexes of population trend of the pest in a transgenic poplar forest were decreased by 82% - 92% than that in the control stand, indicating that the transgenic 741 poplar was able to reduce the natural population of the target insect. The highest mortality occurred at the boring stage of young instars larvae, especially in early stage of 1 st and 2nd instar larva. The food and environment integrated to affect the pest population, and diseases and the pupa natural death caused by the transgenic poplar were most obvious among the all death factors, parasitic rates of different instar larvae of Lymantria dispar in the stand of transgenic hybrid poplar 741 decreased in comparison with the control, which was more obvious in the high insect-resistance hybrid poplar 741.