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Influence of"protective"symbionts throughout the different steps of an aphid-parasitoid interaction

Current Zoology 2021年第4期67卷 441-453页

作者： corentin sochard Laura Bellec Jean-Christophe Simon Yannick Outreman IGEPP INRAEInstitut AgroUniv Rennes35000RennesFrance IGEPP INRAEInstitut AgroUniv Rennes35650Le RheuFrance

Microbial associates are widespread in insects,some conferring a protection to their hosts against natural enemies like *** protective symbionts may affect the infection success of the parasitoid by modifying behavioral defenses of their hosts,the development success of the parasitoid by conferring a resistance against it or by altering life-history traits of the emerging ***,we assessed the effects of different protective bacterial symbionts on the entire sequence of the host-parasitoid interaction(i.e.,from parasitoid attack to offspring emergence)between the pea aphid,Acyrthosiphon pisum,and its main parasitoid,Aphidius ervi and their impacts on the life-history traits of the emerging *** test whether symbiont-mediated phenotypes were general or specific to particular aphid-symbiont associations,we considered several aphid lineages,each harboring a different strain of either Hamiltonella defensa or Regiella insecticola,two protective symbionts commonly found in *** found that symbiont species and strains had a weak effect on the ability of aphids to defend themselves against the parasitic wasps during the attack and a strong effect on aphid resistance against parasitoid *** parasitism resistance was mainly determined by symbionts,their effects on host defensive behaviors varied from one aphid-symbiont association to ***,the symbiotic status of the aphid individuals had no impact on the attack rate of the parasitic wasps,the parasitoid emergence rate from parasitized aphids nor the life-history traits of the emerging ***,no correlations between symbiont effects on the different stages of the host-parasitoid interaction was observed,suggesting no trade-offs or positive associations between symbiont-mediated *** study highlights the need to consider various sequences of the host-parasitoid interaction to better assess the outcomes of protective symbioses and understand the

关键词： Acyrthosiphon pisum defensive behaviors Hamiltonella defensa host-parasitoid interactions protective symbioses Regiella insecticola

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