Context‐dependent vertical transmission shapes strong endosymbiont community structure in the pea aphid, Acyrthosiphon pisum
Context‐dependent vertical transmission shapes strong endosymbiont community structure in the pea aphid, Acyrthosiphon pisum
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DOI：
10.1111/mec.14449
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发表时间：
2018-04
影响因子：
4.9
通讯作者：
Danielle I Rock;Andrew H. Smith;Jonah Joffe;Amie Albertus;Narayan Wong;Michael O'Connor;K. Oliver;J. Russell
中科院分区：
文献类型：
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作者：
Danielle I Rock;Andrew H. Smith;Jonah Joffe;Amie Albertus;Narayan Wong;Michael O'Connor;K. Oliver;J. Russell
动物相关微生物组通常由结构化的多物种群落组成，特定微生物显示出共存或排斥的趋势。这样的结构表明可变的社区稳定性，或可变的成本和收益的可能性与共生驱动的主机适应的影响。在这项研究中，我们进行了系统的筛选母系传播，兼性内共生体的豌豆蚜，Acyrthosiphon豌豆。在六个地点，长达5年的收集，在每个采样，净显着和一致的趋势的社区结构。共生沙雷氏菌和绿色立克次氏体之间的共感染比预期的更常见，而立克次氏体和X型共生体与防御汉密尔顿氏体一起定殖蚜虫的频率比预期的更高。螺原体与其他内共生体共感染的情况非常罕见，表现出作为单一物种单一培养物定殖的趋势。对母体传播率的实地估计有助于解释我们的发现：虽然沙雷氏菌和立克次氏体提高了彼此的传播率，但螺原体降低了共感染内共生体的传播率。总之，我们的研究结果表明，北美豌豆蚜虫港口经常性的兼性内共生体的组合。共同的共生伙伴在豌豆蚜虫生物学中发挥着独特的作用，这表明创造了“多面手”蚜虫接受基于共生体的防御多种生态压力。因此，在宿主水平上的多模式选择可以部分解释我们的结果。但更有说服力的是，我们的研究结果表明，宿主内微生物的相互作用及其对传播率的影响是群落结构的重要决定因素。可遗传共生体在植物和无脊椎动物中的广泛分布暗示了这些发现的深远影响，我们的工作进一步显示了共生研究在自然环境中的好处。
Animal‐associated microbiomes are often comprised of structured, multispecies communities, with particular microbes showing trends of co‐occurrence or exclusion. Such structure suggests variable community stability, or variable costs and benefits—possibilities with implications for symbiont‐driven host adaptation. In this study, we performed systematic screening for maternally transmitted, facultative endosymbionts of the pea aphid, Acyrthosiphon pisum. Sampling across six locales, with up to 5 years of collection in each, netted significant and consistent trends of community structure. Co‐infections between Serratia symbiotica and Rickettsiella viridis were more common than expected, while Rickettsia and X‐type symbionts colonized aphids with Hamiltonella defensa more often than expected. Spiroplasma co‐infected with other endosymbionts quite rarely, showing tendencies to colonize as a single species monoculture. Field estimates of maternal transmission rates help to explain our findings: while Serratia and Rickettsiella improved each other's transmission, Spiroplasma reduced transmission rates of co‐infecting endosymbionts. In summary, our findings show that North American pea aphids harbour recurring combinations of facultative endosymbionts. Common symbiont partners play distinct roles in pea aphid biology, suggesting the creation of “generalist” aphids receiving symbiont‐based defence against multiple ecological stressors. Multimodal selection, at the host level, may thus partially explain our results. But more conclusively, our findings show that within‐host microbe interactions, and their resulting impacts on transmission rates, are an important determinant of community structure. Widespread distributions of heritable symbionts across plants and invertebrates hint at the far‐reaching implications for these findings, and our work further shows the benefits of symbiosis research within a natural context.