转Bt基因抗虫作物对非靶标生物的影响

迄今为止,已经获得了大量的抗虫转Bt基因作物。尽管这些作物中表达的Bt蛋白只是针对靶标害虫起到杀虫效果,但是抗虫转Bt基因作物是否会对非靶标生物产生影响一直存在争议。本文就抗虫转Bt基因作物对节肢动物群落、非靶标植食性昆虫、天敌和有益昆虫的影响进行了综述。综合评价认为,现有的抗虫转Bt基因作物对非靶标生物是安全的。

转Bt基因抗虫玉米对棉铃虫杀虫活性的初步评价

Insecticidal activity of different organs of transgenic corn expressing Cry1Ab insecticidal protein gene from Bacillus thuringiensis (Bt) to Helicoverpa armigera was tested in laboratory. The results showed that popcorn has the lowest activity among the 7 organs of Bt corn, and the order of insecticidal activity was as follows: popcorn < filament < stem < corncob < bract < corn grain < leaf. There was significant difference of insecticidal activity of filament to Cry1Ac resistant population (13.1 fold of resistance ratio) compared with that of a susceptible population of the pest.

棉铃虫对Bt棉花抗性治理技术取得突破

转Bt基因抗虫作物为虫害防治开辟了新的途径,然而虫害通过遗传变异迅速产生抗性,却制约了转Bt基因作物品种的商业化运作,因此,建立抗性预防性治理技术体系是保证转Bt基因作物品种的可持续利用的有效途径。