Race Composition and Virulence of Erysiphe graminis and the Resistance Genes of Wheat Varieties Bred in Martonvásár

L. Szunics, M. Svec, Lu Szunics, M. Miklovicová, G. Vida, T. Slovákova, Z. Bedö

Research output: Contribution to journalArticle

Abstract

Important microevolutional processes have taken place in the wheat powdery mildew population over the last thirty years. There has been a considerable change in the race composition of the pathogen population and in the prevalent races. Of the 78 races identified, only eleven (2, 26, 32, 35, 44, 46, 47, 52, 67, 72, 75) have "lived" for more than 15 years. Many races were only isolated in one or two years. The number of virulence genes rose from 2.03 in 1973 to 5.63 in 1993. On the basis of race composition and virulence the wheat powdery mildew population between 1971 and 1999 can be divided into four distinct groups, using correlation coefficient (r) calculations, principal component analysis (PCA) and cluster analysis (CA). In general smaller changes were observed in the wheat powdery mildew population over a 3-5-year interval, followed by greater changes every 5-7 years, especially if genotypes with a new type of resistance were introduced into cultivation. The correlation became looser as the number of years increased. The majority of cultivated varieties carry the resistance gene Pm8 due to the presence of the 1B/1R translocation.

Original languageEnglish
Pages (from-to)413-420
Number of pages8
JournalActa Phytopathologica et Entomologica Hungarica
Volume35
Issue number1
Publication statusPublished - Dec 1 2000

Keywords

  • Race
  • Resistance genes
  • Virulence
  • Wheat powdery mildew

ASJC Scopus subject areas

  • Plant Science
  • Insect Science

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