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Selection against unnecessary virulence in Puccinia coronata

Abstract : 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.
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https://hal.inrae.fr/hal-02697828
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Submitted on : Monday, June 1, 2020 - 11:39:17 AM
Last modification on : Friday, February 5, 2021 - 4:10:31 AM

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  • HAL Id : hal-02697828, version 1
  • PRODINRA : 63006

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Marc Bardin, K.J. Leonard. Selection against unnecessary virulence in Puccinia coronata. Acta Phytopathologica et Entomologica Hungarica, Akadémiai Kiadó, 2000, 35, pp.223-227. ⟨hal-02697828⟩

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