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Characterizing Virulence of the

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Area of Science:

  • Plant Pathology
  • Molecular Genetics
  • Agricultural Science

Background:

  • Pyrenophora tritici-repentis (Ptr) causes tan spot, a significant global wheat disease.
  • Fungal isolates are classified into races based on necrotrophic effector (NE) production; race 4 produces no known NEs.
  • Laboratory crosses yielded Ptr isolates lacking ToxA and ToxB genes, theoretically classifying them as race 4.

Purpose of the Study:

  • To characterize the virulence of two novel Ptr isolates (B16 and B17) lacking known NE genes.
  • To investigate the genetic basis of tan spot disease resistance in wheat.
  • To identify new interactions between wheat and Ptr virulence factors.

Main Methods:

  • Inoculation of common and durum wheat genotypes with Ptr isolates B16 and B17.
  • Disease evaluation on various wheat cultivars.
  • Quantitative Trait Locus (QTL) mapping in recombinant inbred line populations.

Main Results:

  • Isolates B16 and B17 caused disease on susceptible common and durum wheat genotypes.
  • QTL mapping identified three genomic regions associated with tan spot disease.
  • These identified genomic regions differ from previously known NE sensitivity loci.

Conclusions:

  • The study demonstrates that Ptr isolates lacking known NE genes can still cause significant disease.
  • Novel host-pathogen interactions and genetic factors influencing tan spot resistance in wheat have been identified.
  • These findings suggest the existence of additional NE-host sensitivity gene interactions in the Ptr-wheat pathosystem.