Discovery of a novel circulation route of free-living Serratiasymbiotica mediated by predatory ladybird beetles
Discovery of a novel circulation route of free-living Serratiasymbiotica mediated by predatory ladybird beetles
复制标题
DOI：
10.1093/femsec/fiad133
复制
发表时间：
2023-10-31
影响因子：
4.2
通讯作者：
Pang，Hong
中科院分区：
文献类型：
--
作者：
Du，Xue-Yong;Zhang，Pei-Fang;Pang，Hong
细菌向不同宿主的水平传播可以维持甚至扩大微生物生态位。我们以前发现，蚜虫肠道细菌Serratia symbioticastrain SsMj可以通过捕食传播给瓢虫，但捕食者是否是这种细菌的新宿主，水库或死胡同是未知的。本研究旨在提供一个清晰的画面SsMj循环从蚜虫到植物和捕食者。我们首次发现蚜虫和瓢虫体内的SsMj不仅在消化道中而且在粪便中也有大量分布。我们没有发现SsMj垂直传播给蚜虫后代的证据。相反，我们发现它可以通过共享同一植物或接触蜜瓜传播给同种蚜虫。本研究的关键发现是，SsMj从蚜虫通过捕食传播给瓢虫，而瓢虫也可以将SsMj传回蚜虫，可能是通过粪便。总之，这一证据表明，SsMj能够在昆虫的消化道和粪便中生存，并以植物和捕食者为宿主扩大其宿主范围。
Horizontal transmission of bacteria to varied hosts can maintain and even expand microbial niches. We previously found that the aphid gut bacteriumSerratia symbioticastrain SsMj can be transmitted to ladybird beetles via predation, but whether the predator is a new host, a reservoir or a dead end of this bacterium is unknown. This study aims to provide a clear picture of SsMj circulation from aphids to plants and predators. We first found that SsMj in aphids and ladybirds was abundantly distributed not only in digestive tracts but also in droppings. We found no evidence for vertical transmission of SsMj to aphid offspring. Instead, we showed that it could be transmitted to conspecific aphids by sharing the same plant or contacting honeydews. The key finding of this study is that SsMj was transmitted from aphids to ladybirds through predation, while ladybirds could also transfer SsMj back to aphids, possibly through feces. Together, this evidence suggests that SsMj is able to survive in the digestive tracts and droppings of insects and to expand its host range with plants and predators as reservoirs.