Data from: Hosts do not simply outsource pathogen resistance to protective symbionts

Jan Hrcek, Benjamin J. Parker, Ailsa H.C. McLean, Jean-Christophe Simon, Ciara M. Mann & H. Charles J. Godfray
Microbial symbionts commonly protect their hosts from natural enemies, but it is unclear how protective symbionts influence the evolution of host immunity to pathogens. One possibility is that ‘extrinsic’ protection provided by symbionts allows hosts to reduce investment in ‘intrinsic’ immunological resistance mechanisms. We tested this idea using pea aphids (Acyrthosiphon pisum) and their facultative bacterial symbionts that increase host resistance to the fungal pathogen Pandora neoaphidis. The pea aphid taxon is composed of multiple...
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