黄杜鹃不同部位有效成分含量及对害虫拒食作用的研究  

Studies on the Activity Content of Different Parts of Rhododendron molle and Pest Antifeedant

作　　者：程东美[1] 胡美英[1] 张志祥[1] 

机构地区：[1]华南农业大学昆虫毒理研究室,广东广州510642

出　　处：《华南农业大学学报》2000年第2期25-27,共3页Journal of South China Agricultural University

基　　金：国家自然科学基金资助项目 !(39870 44 0 );广东省自然科学基金资助项目! (970 0 2 6 )

摘　　要：黄杜鹃 (Rhododendronmolle)中活性最高的化合物闹羊花素 (Rhodojaponin) -Ⅲ在花、嫩叶、根、茎中的含量分别为 0 2 0 %、0 1 4 %、0 1 1 %、0 0 8% ,其花、嫩叶、根的粗提物对菜粉蝶 5龄幼虫和斜纹夜蛾 3龄幼虫具有一定的拒食作用 ,而茎无明显的拒食效果 黄杜鹃花、嫩叶、根、茎各部位甲醇粗提物在 φ =1 0 0 %时对菜粉蝶 5龄幼虫 2 4h的拒食率分别为 92 76 %、86 78%、74 90 %、6 3 80 % ,对斜纹夜蛾 3龄幼虫的拒食率分别为 89 94%、80 0 6 %、73 4 8%和 6 3 2 2 % ,RhodojaponinRhodojaponin-Ⅲ was the main toxic component of Rhododendron molle and the content of the flower ,leaf ,foot and stem was about 0.20%,0.14%,0.11% and 0.08%,respectively. Treatment with 1% ethanol extracts of the flower, leaf and foot against the larvae of Pieris rapae and Spodoptera litura showed high antifeeding, the antifeedant rate of flower, leaf and foot to 5th instar larvae of P. rapae was 92.76%, 86.78%, 74.90% and to 3th instar larvae of S. litura was 89.94%, 80.06%, 73.48%, respectively, but the extract of the stems had no obvious antifeedant.The content of Rhodojaponin-Ⅲ had good positive relationship to its antifeedant ratio.

关 键 词：黄杜鹃 Rhodojaponin-Ⅲ 拒食活性 部位 

分 类 号：S482.39[农业科学—农药学] Q949.96[农业科学—植物保护]