Unrelated facultative endosymbionts protect aphids against a fungal pathogen
Unrelated facultative endosymbionts protect aphids against a fungal pathogen
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DOI：
10.1111/ele.12031
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发表时间：
2013-02-01
期刊：
影响因子：
8.8
通讯作者：
Godfray, H. Charles J.
中科院分区：
文献类型：
--
作者：
Lukasik, Piotr;van Asch, Margriet;Godfray, H. Charles J.
微生物兼性内共生体对昆虫的重要性越来越被认识到，但我们对感染的适应性影响如何在共生体类群中分布的理解是有限的。在豌豆蚜虫中，七种已知的兼性共生体中的一些影响其宿主对天敌的抗性，包括寄生蜂和病原真菌。在这里，我们表明，对这种昆虫病原体，新蚜虫潘多拉，可以赋予四个遥远的相关共生体（属Regiella，立克次体，立克次体和螺原体）菌株的保护。它们降低了死亡率，也减少了死亡蚜虫上的真菌孢子形成，这可能有助于保护附近的遗传相同的昆虫。因此，豌豆蚜虫通过与比以前认为的更广泛的微生物缔合物的结合来获得保护。提供对天敌的抗性似乎是兼性内共生体在宿主种群中增加频率的一种特别常见的方式。
The importance of microbial facultative endosymbionts to insects is increasingly being recognized, but our understanding of how the fitness effects of infection are distributed across symbiont taxa is limited. In the pea aphid, some of the seven known species of facultative symbionts influence their host's resistance to natural enemies, including parasitoid wasps and a pathogenic fungus. Here we show that protection against this entomopathogen, Pandora neoaphidis, can be conferred by strains of four distantly related symbionts (in the genera Regiella, Rickettsia, Rickettsiella and Spiroplasma). They reduce mortality and also decrease fungal sporulation on dead aphids which may help protect nearby genetically identical insects. Pea aphids thus obtain protection from natural enemies through association with a wider range of microbial associates than has previously been thought. Providing resistance against natural enemies appears to be a particularly common way for facultative endosymbionts to increase in frequency within host populations.