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据报道,比科时的生物学家们,通过基因工程技术,把苏芸金芽孢杆菌(Bacillus thuringiensis)中含有杀虫毒素的基因转移到烟草里,已经获得抗虫的烟草植株。抗虫的特性不仅表现在当代植株里,而且能够遗传。温室试验证明,幼虫咬食了这种抗虫植株,7天后会全部被杀死。另外的一些试验也得到了类似的结果。幼虫咬食抗虫植株后,5天内幼虫全部消失,叶片仅有轻微伤害;而一般植株4—7天内受到幼虫的严重伤害,10—15天植株全部死亡。这说明烟草从苏芸金芽孢杆菌基因中获得的抗虫毒素是相当有效的。美国农业遗传公司将苏芸金芽孢杆菌的杀虫毒素基因转移到某些植物材料上,也获得了成功。
It has been reported that Bichon biologists have obtained insect-resistant tobacco plants by genetic engineering techniques that transfer insecticidal toxin-containing genes from Bacillus thuringiensis into tobacco. Insect resistance is not only present in contemporary plants, but also inherited. Greenhouse tests showed that the larvae bite this insect-resistant plant and all were killed after 7 days. Other experiments have yielded similar results. Larvae bite the insect-resistant plants, the larvae disappeared within 5 days, leaves only minor injuries; and general plant 4-7 days by larvae serious injury, 10-15 days all the plants died. This shows that the tobacco obtained from the Bacillus thuringiensis virus-resistant toxins are quite effective. American Agricultural Genetics has also succeeded in transferring the insecticidal toxin genes of Bacillus thuringiensis into certain plant materials.