Unrelated facultative endosymbionts protect aphids against a fungal pathogen
- 9 November 2012
- journal article
- letter
- Published by Wiley in Ecology Letters
- Vol. 16 (2), 214-218
- https://doi.org/10.1111/ele.12031
Abstract
The importance of microbial facultative endosymbionts to insects is increasingly being recognized, but our understanding of how the fitness effects of infection are distributed across symbiont taxa is limited. In the pea aphid, some of the seven known species of facultative symbionts influence their host's resistance to natural enemies, including parasitoid wasps and a pathogenic fungus. Here we show that protection against this entomopathogen, Pandora neoaphidis, can be conferred by strains of four distantly related symbionts (in the genera Regiella, Rickettsia, Rickettsiella and Spiroplasma). They reduce mortality and also decrease fungal sporulation on dead aphids which may help protect nearby genetically identical insects. Pea aphids thus obtain protection from natural enemies through association with a wider range of microbial associates than has previously been thought. Providing resistance against natural enemies appears to be a particularly common way for facultative endosymbionts to increase in frequency within host populations.Keywords
This publication has 46 references indexed in Scilit:
- Genomic basis of endosymbiont-conferred protection against an insect parasitoidGenome Research, 2011
- Bacterial symbionts in insects or the story of communities affecting communitiesPhilosophical Transactions B, 2011
- The evolution of host protection by vertically transmitted parasitesProceedings. Biological sciences, 2010
- Effects of bacterial secondary symbionts on host plant use in pea aphidsProceedings. Biological sciences, 2010
- A strain of the bacterial symbiont Regiella insecticola protects aphids against parasitoidsBiology Letters, 2009
- Symbiont-mediated protection in insect hostsTrends in Microbiology, 2009
- A continuum of genetic divergence from sympatric host races to species in the pea aphid complexProceedings of the National Academy of Sciences of the United States of America, 2009
- Symbiont-mediated protectionProceedings. Biological sciences, 2007
- Population dynamics of defensive symbionts in aphidsProceedings. Biological sciences, 2007
- Symbiont modifies host life-history traits that affect gene flowProceedings. Biological sciences, 2006