Development of diagnostic markers and physical mapping for the Rrs1 resistance locus against scald

Abstract

Rhynchosporium secalis, the causal agent of scald, is still one of the most important foliar diseases of barley. Its high genetic variability and recombination frequency enable it to rapidly overcome monogenic resistances. To date four major scald resistance genes have been identified in cultivated barley (Hordeum vulgare ssp. vulgare), and another four in wild barley (Hv. spontaneum or Hv. bulbosum). The most abundant and effective one is the Rrsl resistance locus, mapping near the centromeric region of chromosome 3H. Aim of the project is the fine mapping of the Rrsl locus and the development of diagnostic markers.