薇甘菊挥发油的化学成分及其对昆虫的生物活性

Chemical components of volatile oil from Mikania micrantha and its biological activity on insects.

用GC/MS分析了薇甘菊挥发油的化学成分 ,共鉴定了 2 2个化合物 ,单萜和倍半萜及其醇和酮的衍生物是其主要成分 ,并研究了薇甘菊挥发油对昆虫的生物活性 .结果表明 ,在 5～ 10 μl·株 -1的用量时 ,它们对小菜蛾、黄曲条跳甲和猿叶虫有显著的产卵驱避作用 .同时也具有一定的触杀毒力 ,在 5 0 0、75 0、10 0 0mg·L-1浓度时 ,对萝卜蚜的校正虫口减退率分别为 5 0 .0 %、5 9.86 %和 6 2 .5 1% .然而 ,在 5 0 0mg·L-1浓度时 ,对萝卜蚜、小菜蛾和黄曲条跳甲等不同受试虫态却无熏蒸毒杀作用 .

The chemical components of volatile oil from Mikania micrantha were analyzed by GC/MS. Twenty-two compounds were identified, and monoterpenes and sesquiterpenes as well as alcohol and ketone with their derivatives were major components. Biological activity of volatile oil on insect was investigated. The results showed that the volatile oil had significant deterrent effect on oviposition of Plutella xylostella, Phyllotreta striolata and Phaedon brassicae at dose of 5～10μl·plant -1.They also possessed established contacting toxicity, and their rectifying reduce rates for Lipaphis erysimi were 50.0%, 59.86%, 62.51% at concentration of 500, 750, and 1000mg·L -1,respectively.However, they had not fumigating toxicity for virginogeniae, L. erysimi, 2 nd instar larvae of P. xylostella, and adult of P. striolata at concentration of 500mg·L -1.