诱集植物大叶千斤拔与茶树联合抗性机制的研究

Tea (Camellia sinensis (L.) O. Ktze) is an importance economic plant and damages induced by insects is the major problem in the tea production. Constructing mixed-species tea garden is useful to improve ecological environment of tea garden, but also increase the ability of ecological regulation. Flemingia macrophylla Merr. belongs to Legume performing the function of nitrogen fixation and also can attract some dangerous defoliating insects as trap plant intercropped in tea garden. The model of Flemingia macrophylla intercropped in tea garden has been applied widely in tea producing region in Southern of Yunnan . But the mechanism of associational resistance of tea and Flemingia macrophylla is still unknown. Field investigation and control experiment will be used in this mixed species garden to study : 1) effects of Flemingia macrophylla on diversity and time-space pattern of insects and their enemies, 2) effects of nutrient components and secondary metabolisms of Flemingia macrophylla on feeding behavior of defoliating insects, 3) effects of herbivore-induced plant volatiles of Flemingia macrophyll on host location of enemies. Elucidation the trapping function of Flemingia macrophyll for insects and its natural enemies will reveal the mechanism of associational resistance of tea and Flemingia macrophyll. The research results will provide theoretical basis for the ecological regulation of insects and scientific support for the construction of ecological tea garden.

茶树是重要的经济作物，虫害是茶叶生产中面临的主要问题。建立复合生态茶园能够改善茶园生态环境，发挥天敌对害虫的生态调控作用。大叶千斤拔为豆科植物，不仅可固氮，还能诱集茶园主要的食叶害虫。在滇南茶区，已利用大叶千斤拔建立了大面积的复合生态茶园，但对茶树-大叶千斤拔的联合抗性机制还不清楚。本项目拟以已建立的茶树-大叶千斤拔复合生态茶园为研究对象，通过野外观测与控制实验，重点研究：1）大叶千斤拔对茶园昆虫和天敌群落多样性及其时空分布格局的影响；2）大叶千斤拔营养成分和次生代谢物对茶园害虫取食行为的影响；3）大叶千斤拔虫害诱导挥发物对茶园天敌寄主定位行为的影响，揭示茶树-大叶千斤拔的联合抗性机制，为茶园害虫的生态调控及生态茶园建设提供理论依据和实践指导。