Virulence heterozygosity and gametic phase disequilibria in two populations of puccinia recondita (Wheat leaf rust fungus)

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Abstract

Random mating aecial populations were derived from the eastern and prairie uredinial populations of Puccini recondita f. sp. tritici in Canada to assess the degree of virulence heterozygosity and gametic phase disequilibria between virulence loci in the two populations. In the aecial generation, both populations were genetically polymorphic at virulence loci that had low levels of phenotypic polymorphism in the uredinial generation. Different levels of genetic polymorphism for virulence allowed further discrimination between the two populations. High levels of virulence heterozygosity were detected in both populations to resistance genes originally derived from Triticum aestivum. Genetic linkage, and gametic phase disequilibria between genetically independent virulence loci were detected in both populations. However, disequilibrium were stronger and more prevalent in the highly selected prairie population.

Original languageEnglish (US)
Pages (from-to)505-513
Number of pages9
JournalHeredity
Volume68
Issue number6
DOIs
StatePublished - Jun 1992

Keywords

  • Puccinia recondita
  • Resistance genes
  • Triticum
  • Virulence heterozygosity
  • Wheat leaf rust

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