Consequences of coinfection with protective symbionts on the host phenotype and symbiont titres in the pea aphid system
Consequences of coinfection with protective symbionts on the host phenotype and symbiont titres in the pea aphid system作者机构：IGEPP Agrocampus Ouest INRA Universite de Rennes 1 Universite Bretagne-Loire Rennes France IGEPP Agrocampus OuestINRA Universit6 de Rennes 1 Le Rheu France Bioproduction Research Institute AIST Tsukuba Japan Graduate School of Science and Engineering University of Toyama Toyama Japan
出 版 物：《Insect Science》 (昆虫科学（英文版）)
年 卷 期：2017年第24卷第5期
页 面：798-808页
核心收录：
学科分类：090603[农学-临床兽医学] 0820[工学-石油与天然气工程] 080706[工学-化工过程机械] 08[工学] 09[农学] 0906[农学-兽医学] 0807[工学-动力工程及工程热物理] 082003[工学-油气储运工程]
基 金：supported by French “Ministere de l’Enseignement Superieur et de la Recherche,” by funds from the French-Japanese Sakura programme held by Campus France and JSPS (Japan Society for the Promotion of Science) TF & TT were supported by KAKENHI
主 题：Acyrthosiphon pisum Hamiltonella defensa host fitness multiple infections protective symbionts symbiont abundance
摘 要：Symbiotic associations between microbes and insects are widespread, and it is frequent that several symbionts share the same host individual. Hence, interactions can occur between these symbionts, influencing their respective abundance within the host with consequences on its phenotype. Here, we investigate the effects of multiple infections in the pea aphid, Acyrthosiphon pisurn, which is the host of an obligatory and several facultative symbionts. In particular, we study the influence of a coinfection with 2 protective symbionts： Harniltonella defensa, which confers protection against parasitoids, and Rickettsiella viridis, which provides protection against fungal pathogens and predators. The effects of Hamiltonella-Rickettsiella coinfection on the respective abundance of the symbionts, host fitness and efficacy of enemy protection were studied. Asymmetrical interactions between the 2 protective symbionts have been found： when they coinfect the same aphid individuals, the Rickettsiella infection affected Hamiltonella abundance within hosts but not the Hamiltonella-mediated protective phenotype while the Hamiltonella infection negatively influences the Rickettsiella-mediated protective phenotype but not its abundance. Harboring the 2 protective symbionts also reduced the survival and fecundity of host individuals. Overall, this work highlights the effects of multiple infections on symbiont abundances and host traits that are likely to impact the maintenance of the symbiotic associations in natural habitats.
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