作物多样性种植能够有效控制土传病害，根系-微生物相互作用抑制病原菌传播是间作抑制疫病的重要机制。前期研究发现玉米和辣椒间作中玉米根能够吸引辣椒疫霉菌的游动孢子，促使其转化为休止孢并最终裂解。这种“先吸引后裂解”的现象在多种非寄主植物根系-疫霉菌的相互作用中普遍存在，申请者所在团队将其命名为attract-kill模式。此模式可能是间作能控制疫病发生的重要机制。本项目针对attract-kill控病模式开展下列研究：①验证玉米-大豆疫霉菌互作是否符合attract-kill模式；②分离鉴定attract-kill控病模式中玉米根系引起大豆疫霉菌游动孢子趋化、休止和裂解的关键物质；③分析玉米根系attract-kill控病模式中的关键物质的普适性。预期结果对解析和确定attract-kill模式的化学生态学机理和普适性具有重要理论价值 ，对科学利用attract-kill控病模式具有实际意义。

Biodiversity could provide relief to crops against soil-borne disease. The interaction between plant roots and pathogen play an important role in suppression of phytophthora disease in intercropping system. Our recent research indicated that maize roots attracted the zoospores of phytophthora capsici and inhibited their motility, then a large amount of cystospores closed to maize roots were lysed. We named this phenomenon “attrack-kill” pattern which was widely found in various interactions between roots of non-host plant and phytophthora. The “attrack-kill” pattern between roots of non-host plant and phytophthora may be the most important reason in phytophthora disease suppression in intercropping system. This project research the “attract-kill” pattern as follows: ① demonstrate that the interaction between maize roots and phytophthora sojea was accordance with “attrack-kill” pattern; ②isolated and identified the effective compound induced chemotaxis, cystospores formation and lysed cystospores of phytophthora sojea in root exudates of maize. ③analyze the universality of effective compound in root exudates of maize. Based on these studies. We canexplorer the chemical ecology mechanism of “attrack-kill” pattern. These studies will benefit us to further understand the mechanism of disease suppression by biodiversity and to develop “attrack-kill” pattern to inhibit the demage of phytophthora.