Genetics of resistance to the rust fungus Coleosporium ipomoeae in three species of morning glory (Ipomoea).

Published

Journal Article

We examined the genetic basis of resistance to the rust pathogen Coleosporium ipomoea in three host species: Ipomoea purpurea, I. hederacea, and I. coccinea (Convolvulaceae). In crosses between resistant and susceptible individuals, second-generation selfed offspring segregated in ratios that did not differ statistically from the 3:1 ratio indicative of single-gene resistance with the resistant allele dominant. One out of three crosses between resistant individuals from two different populations revealed that resistance loci differed in the two populations, as evidenced by the production of susceptible individuals among the S(2) generation. These results suggest that gene-for-gene interactions contribute substantially to the dynamics of coevolution in this natural pathosystem. They also suggest that evolution of resistance to the same pathogen strain may involve different loci in different Ipomoea populations.

Full Text

Duke Authors

Cited Authors

  • Chappell, TM; Rausher, MD

Published Date

  • January 2011

Published In

Volume / Issue

  • 6 / 12

Start / End Page

  • e28875 -

PubMed ID

  • 22194936

Pubmed Central ID

  • 22194936

Electronic International Standard Serial Number (EISSN)

  • 1932-6203

International Standard Serial Number (ISSN)

  • 1932-6203

Digital Object Identifier (DOI)

  • 10.1371/journal.pone.0028875

Language

  • eng