钾元素对苜蓿抗蓟马的调控机制

以牛角花齿蓟马（Odontothrips loti）为优势种的蓟马类害虫已成为北方苜蓿生产的重要威胁和障碍，如何持续、安全、有效地防治苜蓿蓟马是当前苜蓿管理中的瓶颈。在作物病虫害的生态控制中钾肥具有非常重要作用，同时钾元素也是苜蓿生长代谢的重要元素之一。本项目拟以苜蓿重要害虫—牛角花齿蓟马为研究对象，以抗蓟马苜蓿甘农9号和感蓟马苜蓿甘农3号为材料，探索研究不同水平钾处理下，牛角花齿蓟马的繁殖、存活、生长发育和寿命，及其与苜蓿叶片钾元素、营养物质和次生代谢物质的含量变化的关系；受蓟马为害后，苜蓿的抗性表现、生长特性、叶片光合生理、叶片结构等变化；苜蓿根茎叶中同化产物和矿质元素含量的变化；揭示钾元素对苜蓿营养与牛角花齿蓟马互作的影响机制，阐明钾元素增强苜蓿对蓟马耐害性的内在作用机理，为土壤营养-苜蓿-蓟马的互作深入研究奠定理论基础，同时为苜蓿蓟马的生态调控提供可行的理论依据。

Odontothrips loti as dominant species of thrips had composed serious threat and obstacle for alfalfa production. How to prevent and control thrips sustainably, securely and effectively is   a bottleneck in current alfalfa management. Potassium is the most important elements for crop resistance to pest, also it is one of the most important elements for alfalfa growth, definiting its effects mechanisms will expand a new aspect for alfalfa thrips preventing and controlling friendly. Gannong No.9 alfalfa（resistant to thrips）and Gannong No.3 alfalfa（susceptible to thrips) will be chosen for the project. The research will begin with the effects of different potassium level on O. loti fecundity, survival, development and longevity, and its correlation with potassium, nutrition and secondary metabolites in alfalfa leaves.   Alfalfa resistance to O. loti and its mechanism in greenhouse, including damage index, alfalfa growth, photosynthesis and leaf structure, assimilation product and mineral element in alfalfa organs under the different potassium level. The study will discover the mechanism of interaction of potassium -O. loti- alfalfa, and adjusting mechanism for alfalfa resistance(tolerance) to thrips. The research will establish theoretical foundation for further study of the interaction of soil nutrients - alfalfa - thrips, and provide the valuable reference for reducing alfalfa thrips damage and ecological controlling of alfalfa pests.