| 摘要: |
| 测定了闹羊花素-Ⅲ(Rhodjaponin-Ⅲ,简称R-Ⅲ)等黄杜鹃花提取物对甜菜夜蛾的生物活性。结果表明,在非选择性和选择性条件下,R-Ⅲ对甜菜夜蛾3龄幼虫拒食作用的AFC50分别是30. 71和7. 30mg·L-1;乙酸乙酯(EtOAc)萃取物的AFC50分别是808. 82和650. 43 mg·L-1,拒食活性显著高于其他粗提物。连续饲喂48 h后,至第5天, R-Ⅲ和EtOAc萃取物对试虫的生长抑制中质量浓度(IC50)分别是13. 11和1 153. 48mg·L-1。 |
| 关键词: 黄杜鹃花,闹羊花素-Ⅲ,甜菜夜蛾 |
| DOI： |
| 分类号:S482.39 |
| 基金项目:国家自然科学基金资助项目(39870440)，广东省自然科学基金资助项目(970026) |
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| Bioactivities of the extracts from Rhododendron molle flowers against beet armyworm Laphygma exigua |
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ZHONG Guo hua HU Mei ying WENG Qun fang
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| Abstract: |
| Prelim inary studies on the bioactivities of the extracts from Rhododendron molle flowers against beet armyworm Laphygma exigua were conducted.The values of medium antifeeding concentration (AFC50) of R-Ⅲand ethyl acetate (EtOAc) extract against 3 rd larvae of L.exigua were 30. 71 and 808. 82mg·L-1 in no-choice tests, and were 7. 30 and 650. 43mg·L-1 in choice tests, respectively.Given the treated diet with R-Ⅲ and EtOAc extract for 48 h to larvae and after 5 days treatment, the values of IC50(themedium inhibitory concentration)were 13. 11 and 1 153. 78mg·L-1, resp. |
| Key words: Rhododendron molle flowers rhodojaponin-Ⅲ Laphygma exigua |
