Evolution of host range in Coleosporium ipomoeae, a plant pathogen with multiple hosts.

Journal Article (Journal Article)

Plants and their pathogens coevolve locally. Previous investigations of one host-one pathogen systems have demonstrated that natural selection favors pathogen genotypes that are virulent on a broad range of host genotypes. In the present study, we examine a system consisting of one pathogen species that infects three host species in the morning glory genus Ipomoea. We show that many pathogen genotypes can infect two or three of the host species when tested on plants from nonlocal communities. By contrast, pathogen genotypes are highly host-specific, infecting only one host species, when tested on host species from the local community. This pattern indicates that within-community evolution narrows the host breadth of pathogen genotypes. Possible evolutionary mechanisms include direct selection for narrow host breadth due to costs of virulence and evolution of ipomoea resistance in the host species.

Full Text

Duke Authors

Cited Authors

  • Chappell, TM; Rausher, MD

Published Date

  • May 2016

Published In

Volume / Issue

  • 113 / 19

Start / End Page

  • 5346 - 5351

PubMed ID

  • 27114547

Pubmed Central ID

  • PMC4868424

Electronic International Standard Serial Number (EISSN)

  • 1091-6490

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.1522997113


  • eng