转基因抗病虫作物的出现为人们防治植物病虫害开拓了新的思路,但随着人们长期单一地在作物中导入某个基因,如Bt基因,又出现了新的问题。一是应用这类基因不能有效防治有些害虫,如引起同翅目蚜虫在转Bt棉上的再猖獗现象:二是某些害虫已对这类长期使用的基因产生了抗性,如鳞翅目的棉铃虫和小菜蛾已对Bt基因产生了不同程度的抗性。因此,解决这一问题的有效方法是筛选出新的抗病虫(特别是抗同翅目害虫)基因。植物凝集素具有对鳞翅目、特别是对同翅目的蚜虫、飞虱、叶蝉等刺吸式口 The emergence of transgenic pest-resistant crops opens up new ideas for people to control plant diseases and insect pests. However, new problems have arisen as a result of long-term introduction of a single gene in crops such as Bt gene. First, the application of these genes can not effectively control some pests, such as causing homopteran aphids in turn Bt cotton on the rampant phenomenon: Second, some pests have long-term use of these genes have been resistance, such as Lepidoptera The cotton bollworm and the diamondback moth have had different degrees of resistance to the Bt gene. Therefore, an effective way to solve this problem is to screen out new genes for resistance to pests, especially against homopteran pests. Phytohemagglutinin has a spiked mouth, especially for the homopteran aphids, planthoppers, leafhoppers and other sucking mouth