转Bt基因水稻对三化螟自然种群的影响

Effects of transgenic Bt rice on Scirpophaga incertulas (Walker) populations in paddy fields

为了了解水稻重要害虫三化螟Scirpophaga incertulas（Walker）对转Bt基因水稻产生抗性的潜在风险，本文利用自然种群生命表，研究了第3代三化螟在转Bt基因杂交稻汕优63及非转Bt基因杂交稻汕优63上的种群参数。结果表明：在Bt稻上1～2龄幼虫的存活率为4．03％，极显著低于非转基因SY63（55．76％）；Bt稻上幼虫为害率为1．75％，极显著低于非转基因SY63（5．98％）；Bt稻上存活的幼虫发育历期明显长于非转BtSY63。

In order to investigate the reslsltence potentials of Scirpophaga mcertulas（ Walker） to transgenlc Bt rice, the population parameters of the 3rd generation of S. incertulas on hybrid Bt rice and non-Bt hybrid rice were studied. The results showed that the survival rate of early instar larvae at the boring stage on Bt hybrid rice was 4.03%, significantly lower than that on non-Bt hybrid rice （55.76%）. The infestation rate of larval on Bt hybrid rice was 1.75%, remarkably lower than that on non-Bt hybrid rice （5.98%）. The larval developmental duration of S. incertulas on Bt hybrid rice was highly prolonged when compared with non-Bt rice.