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许多植物本身会产生各种抑制害虫生长的化学物质。目前,美国农业部的化学家们正致力于发掘这些化学物质,并转移到作物中,加强作物的抗虫性。他们已经发现,各种酸浆属植物和矮牵牛属植物含有能极大地抑制番茄果虫、谷穗虫、螟蛉虫生长的化学物质。研究者们将这种化学物质提取出来,加入到番茄果虫的食物中,6天后,喂食这种化学物质的果虫体重只有喂食其它食物的果虫的3～10%。最近,他们选择不同属的植物细胞进行细胞公交,一旦获得有利于上述化学物质产生的基因,他们就采用DNA
Many plants themselves produce a variety of chemicals that inhibit the growth of pests. Currently, USDA chemists are working to find these chemicals and divert them into crops to enhance crop pest resistance. They have found that a variety of Physalis and Petunia plants contain chemicals that greatly inhibit the growth of tomato fruit flies, grain ears and stem borers. Researchers extracted this chemical and added it to tomato fruitworms. After 6 days, the fruitworms fed this chemical weighed only 3 to 10% of the weight of the foodworms fed other foods. Recently, they chose different genus plant cells for cell transit, and once a gene favorable for the production of the above chemicals was obtained, they used DNA