Selection Against Unnecessary Virulence in Puccinia coronata

M. Bardin, K. J. Leonard

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5 Scopus citations


A population of Puccinia coronata derived from a bulk collection of urediniospores from oat growing near a hedge of the aecial host, Rhamnus cathartica, was grown for 10 uredinial generations on seedlings of a susceptible oat cultivar in the greenhouse. Frequency of virulence to 14 of 20 single-gene differential oat lines decreased significantly from generation 1 to generation 10. The frequency of virulence to five of the lines did not change, and frequency of virulence to one line increased significantly. The mean number of virulences per single-pustule isolate decreased from 12.5 in generation 1 to 9.1 in generation 10. The apparent conflict between this evidence supporting stabilizing selection against unnecessary virulence and the prevalence of unnecessary virulence revealed in field surveys of oat crown rust is discussed.

Original languageEnglish (US)
Pages (from-to)223-227
Number of pages5
JournalActa Phytopathologica et Entomologica Hungarica
Issue number1
StatePublished - 2000


  • Oat crown rust
  • Puccinia coronata
  • Resistance
  • Stabilizing selection
  • Virulence


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