Consequences of coinfection with protective symbionts on the host phenotype and symbiont titres in the pea aphid system
2017
Leclair, Mélaine | Polin, Sarah | Jousseaume, Thibault | Simon, Jean-Christophe | Sugio, A. | Morliere, S. | Fukatsu, T. | Tsuchida, T. | Outreman, Yannick | Institut de Génétique, Environnement et Protection des Plantes (IGEPP) ; Institut National de la Recherche Agronomique (INRA)-Université de Rennes (UR)-AGROCAMPUS OUEST | National Institute of Advanced Industrial Science and Technology (AIST) | School of Science [Univ of Toyama] ; University of Toyama | Ministère de l'Education Nationale, de l'Enseignement Supérieur et de la Recherche | 31943SG, Japan Society for the Promotion of Science | French-Japanese Sakura programme | 22128007, KAKENHI
International audience
Mostrar más [+] Menos [-]Inglés. 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 pisum, which is the host of an obligatory and several facultative symbionts. In particular, we study the influence of a coinfection with 2 protective symbionts: Hamiltonella 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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