Patterns of resistance of Israeli wild emmer wheat to pathogens I. Predictive method by ecology and allozyme genotypes for powdery mildew and leaf rust

E. Nevo, J. G. Moseman, A. Beiles, D. Zohary

Research output: Contribution to journalArticlepeer-review

Abstract

The association of ecological factors and allozyme markers with genotypes of tetraploid wild emmer wheat, Triticum dicoccoides, varying in resistance to four cultures of the pathogen Erysiphe graminis tritici, and to one culture of Puccinia recondita tritici, which incite the diseases powdery mildew and leaf rust respectively, were explored theoretically and practically. The study involved 233 accessions comprising 10 populations representing the ecological range of T. diococcoides in Israel. Our results indicate that genetic polymorphism for resistance to both pathogens is structured geographically, and is predictable by climatic as well as allozymmc markers. Three variable combinations of water factors and temperature differentials significantly explain 0.27 and 0.14 of the spatial variance for resistance to powdery mildew and leaf rust, respectively, suggesting the involvement of natural selection. Several allozyme genotypes, singly, or in combination, are significantly associated with disease resistance. We conclude that T. dicoccoides populations in Israel, which grow in the center of diversity of the species, contain large amounts of unexploited disease resistant genotypes. The populations could be effectively screened and utilized for producing resistant cultivars by means of ecological factors and allozyme markers as predictive guidelines.

Original languageEnglish
Pages (from-to)209-222
Number of pages14
JournalGenetica
Volume67
Issue number3
DOIs
StatePublished - Oct 1985

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Genetics
  • Plant Science
  • Insect Science

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