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Aphids are associated with several facultative bacterial endosymbionts that may influence their interactions with other organisms. We show here that one of the three most common facultative symbionts of pea aphid (Acyrthosiphon pisum), the bacterium Regiella insecticola, has a major effect on host resistance to a fungal pathogen. Experimental establishment of the bacterium in uninfected aphid clones led to higher survival after fungal attack. The bacteria also increased the aphid's inclusive fitness, because the presence of the symbiont reduced the probability of fungal sporulation on aphid cadavers, hence lowering the rate of transmission of the disease to nearby related aphids.

Original publication

DOI

10.1126/science.1120180

Type

Journal article

Journal

Science

Publication Date

16/12/2005

Volume

310

Keywords

Animals, Aphids, Enterobacteriaceae, Entomophthorales, Molecular Sequence Data, Spores, Fungal, Symbiosis