Horizontal transfer of facultative endosymbionts is limited by host relatedness

Evolution; International Journal of Organic Evolution
Piotr ŁukasikJ Ferrari

Abstract

Heritable microbial symbionts can have important effects on many aspects of their hosts' biology. Acquisition of a novel symbiont strain can provide fitness benefits to the host, with significant ecological and evolutionary consequences. We measured barriers to horizontal transmission by artificially transferring facultative symbionts from the grain aphid, Sitobion avenae, and five other aphid species into two clonal genotypes of S. avenae. We found the symbiont Hamiltonella defensa establishes infections more easily following a transfer from the same host species and that such infections are more stable. Infection success was also higher when the introduced symbiont strain was more closely related to the strain that was originally present in the host (but which had previously been removed). There were no differences among successfully established symbiont strains in their effect on aphid fecundity. Hamiltonella defensa did not confer protection against parasitoids in our S. avenae clones, although it often does in other aphid hosts. However, strains of the symbiont Regiella insecticola originating from two host species protected grain aphids against the pathogenic fungus Pandora neoaphidis. This study helps describe the extent...Continue Reading

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Citations

Aug 3, 2016·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Ailsa H C McLeanH Charles J Godfray
Mar 3, 2017·Evolution; International Journal of Organic Evolution·Benjamin J ParkerH Charles J Godfray
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Mar 14, 2018·BMC Evolutionary Biology·Natalie NiepothLee M Henry
Dec 19, 2019·BMC Biotechnology·Doron Shalom Yishai ZaadaEdouard Jurkevitch
Jan 30, 2021·Molecular Ecology·Benjamin J ParkerH Charles J Godfray

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