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Two dominant genes for resistance to powdery mildew (caused byBlumeria graminis f.sp. hordei) from the PI296825 and PI466461accessions of wild barley (Hordeum vulgare subsp. spontaneum)were identified close to the subtelomeric region of the shortarm of chromosome 7H. Genetic analyses predicted two resistanceloci in F2 populations established from crosses between each ofthe two accessions and the winter barley (H. vulgare) varietyTiffany. Genetic mapping revealed a highly effective (52% ofphenotypic variation) resistance gene from PI296825 locatedbetween the markers GBMS192 and GBM1060. In F2 plantsexhibiting resistance reaction types (RT) 0 to RT1–2, specificDNA fragments for co-segregating markers were amplified. Inplants with RT2 and RT2–3, the resistance was conferred byanother unidentified resistance gene. In PI466461, theresistance gene found on the short arm of chromosome 7H wasflanked by the markers GBM1126 and GBM1060. Another resistancegene coincided with the Mla locus. Resistance in RT0 plants wasconferred by both resistance genes, which accounted for 58% ofthe total phenotypic variation. The two resistance genes withthe same location on chromosome 7H have different phenotypiceffects on the resistance in RT0 plants; therefore, theresistance alleles could be at different loci.

Newly discovered genes for resistance to powdery mildew in the subtelomeric region of the short arm of barley chromosome 7H