媒介昆虫-病毒-植物互作加剧生物入侵的过程和生理机制

Processes and physiological mechanisms of the vector-begomovirus-plant interactions in accelerating biological invasions

烟粉虱(Bemisia tabaci)及其传播的双生病毒是全球性重大入侵生物,给农业生产造成了严重损失。媒介昆虫—病毒—植物互作是决定病害流行和昆虫种群动态的重要因子,但其在生物入侵中所起的作用一直未受到关注。入侵烟粉虱与双生病毒通过寄主植物所形成的间接互惠共生关系可能是其广泛入侵并取代土著近缘生物的一个重要生态机制。现已从植物生理变化、昆虫共生细菌生理功能和昆虫生理反应三个方面综合探讨这种互惠共生关系的生理机制及分子机制,以期深入揭示媒介昆虫与病毒互作在生物入侵中的作用,为发展高效的预警和治理技术体系提供理论基础。

Bemisia tabaci and the begomoviruses it transmits are important invasive pests worldwide, which have caused enormous damage to crops. Vector-begomovirus-plant interactions are potentially important determinants of disease epidemics and population dynamics of insects; however, their roles in biological invasions arepoorly understood. Our investigations indicate that an indirect mutualistic relationship between B. tabaci and begomoviruses may be established via their shared host plants and such an indirect mutualism may accelerate the process of biological invasions. We have also been investigating the physiological and molecular mechanisms of the indirect mutualism, including the physiological changes of host plants, functions of endosym-bionts associated with vector insects and physiological reactions of the insects. Our objectives are to reveal theroles of vector-begomovirus-plant interactions in biological invasions and provide fundamental information forthe development of more effective fore warning and management systems.