Cooperative research on biologicalcontrolofplantpest

对中国病虫害生物防治现状进行了研究。最后的报告总结了生物学研究和应用的最新进展。重点研究了PGPR菌株荧光假单胞菌FPT9601对番茄青枯病的生物防治。结果表明，该菌株在单子叶植物和双子叶植物的根组织中均能定殖。它们在根表面的凹陷部分形成微菌落，如容易入侵细菌病原体的受伤部位，这表明该部分的PGPR菌株似乎适合抑制病原体。一旦细菌侵入根部，植物就会产生诱导抗性。细菌中的Flaggellin组分是植物定殖和诱导防御反应的重要因素。此外，2，4-DAPG，即二乙酰间丙二酚，也被发现是抑制青枯病菌株的主要抗菌因子。另一方面，中国还研究了害虫生物防治的方法。通过对天敌的引种、天敌的保护、天敌操纵的环境管理、生防剂的增防和释放等方面的研究，为提高中国的生物防治水平做出了贡献。

Current status in China of biological control of plant diseases and insect pest was studied. The recent development of biological research and application was summarized in the final report. We especially studied on biological control of tomato bacterial wilt by PGPR strain, Pseaudomonas fluorescence FPT9601. It was found that the strain could colonize within the root tissues of both monocot and dicot plants. They formed microcolonies in a concave portion in the root surface such as injured places from which bacterial pathogens can be easily invaded, indicating that the presence of PGPR strains in the portion seem to be appropriate for suppressing the pathogens. Once the bacteria were invaded in roots, an induced resistance was activated in plants. Flaggellin components of the bacteria were important factor for colonization and induction of defense response in plants. Also, 2,4-DAPG, diacetylphlorogrucinol, was found as a major antibacterial factor to suppress the bacteria wilt strain. On the other hand, the methods employed for biological control of insect pests have been studied in China. It was found that introduction of natural enemies, conservation, environment management for manipulation of natural enemies, augmentation and release of biological control agents have been developed and they greatly contribute to the improvement of the biological control in China.