摘要
用叶碟法测定银杏酚对菜青虫的拒食活性,拒食率为30.1%至81.5%,银杏酚影响菜青虫的生长发育,使其发育为超龄幼虫,多数超龄幼虫不能形成蛹而致死。银杏酚对菜青虫防治作用机理是:银杏酚抑制了前胸腺一些重要酶的合成活性,影响了正常蜕皮和生长发育,使其拒食和死亡。例如,银杏酚抑制酪氨酸酶的合成。酪氨酸酶的作用是,催化酪氨酸,经过一系列反应,生成蜕皮后新表皮所需的硬化物质。由于银杏酚抑制了酪氨酸的合成,影响了害虫的正常蜕皮和生长发育,使其发育为超龄幼虫,拒食而死亡。由于昆虫都有外骨骼,在生长发育过程中都要多次蜕皮,所以银杏酚对蚜虫防治作用机理,与银杏酚对菜青虫防治作用机理相同。都是由于银杏酚抑制了前胸腺一些重要酶合成,影响了正常蜕皮和生长发育,致其死亡。
The study showed that anti-feeding rate caused by ginkgol to the cabbage caterpillars ranged from 30.1% to 81.5%. The ginkgol hinders the growth rate of the cabbage caterpillars, and forced the insects to develop into over-aged larva. The majority of larva died due to the failure to form pupa. It was considered that the anti-feeding mechanism of ginkgol was that ginkgol inhibits the activities of some synthetases in front thymus, which in turn inhibits the normal exuviation and growth of the larva. As a result, the cabbage caterpillars refuse to eat and die. For example, ginkgol suppresses the synthesis of tyrosinase which serves as the catalystic tyrosine to enable insects to generate the sclerosis substance which is essential in the new skin formation after exuviation. The normal exuviation and development is inhibited because ginkgol suppresses the synthesis of tyrosinase, which caused caterpillar to develop to overaged larva, dying of apastia. The fact that every insect has the exoskeleton means that insect has to experience several times of exuviation. Thus the mechanism of gingkol to aphid is the same as to cabbage caterpillars.
出处
《农药研究与应用》
2008年第4期31-34,共4页
Agrochemicals Research & Application
关键词
银杏酚
菜青虫
酪氨酸酶
超龄幼虫
ginkgo phenol
cabbage caterpillar
tyrosine enzyme
overage warms
