Czech J. Genet. Plant Breed., 2013, 49(3):95-102 | DOI: 10.17221/33/2013-CJGPB

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

Martina SOLDÁNOVÁ1, Jan IŠTVÁNEK1, Jana ŘEPKOVÁ1, Antonín DREISEITL2
1 Department of Experimental Biology, Masaryk University, Faculty of Science, Brno, Czech Republic
2 Department of Integrated Plant Protection, Agricultural Research Institute in Kromeriz, Kroměříž, Czech Republic

Two dominant genes for resistance to powdery mildew (caused by Blumeria graminis f.sp. hordei) from the PI296825 and PI466461 accessions of wild barley (Hordeum vulgare subsp. spontaneum) were identified close to the subtelomeric region of the short arm of chromosome 7H. Genetic analyses predicted two resistance loci in F2 populations established from crosses between each of the two accessions and the winter barley (H. vulgare) variety Tiffany. Genetic mapping revealed a highly effective (52% of phenotypic variation) resistance gene from PI296825 located between the markers GBMS192 and GBM1060. In F2 plants exhibiting resistance reaction types (RT) 0 to RT1-2, specific DNA fragments for co-segregating markers were amplified. In plants with RT2 and RT2-3, the resistance was conferred by another unidentified resistance gene. In PI466461, the resistance gene found on the short arm of chromosome 7H was flanked by the markers GBM1126 and GBM1060. Another resistance gene coincided with the Mla locus. Resistance in RT0 plants was conferred by both resistance genes, which accounted for 58% of the total phenotypic variation. The two resistance genes with the same location on chromosome 7H have different phenotypic effects on the resistance in RT0 plants; therefore, the resistance alleles could be at different loci.

Keywords: DNA marker; genetic mapping; Hordeum vulgare; simple sequence repeats

Published: September 30, 2013  Show citation

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SOLDÁNOVÁ M, IŠTVÁNEK J, ŘEPKOVÁ J, DREISEITL A. Newly discovered genes for resistance to powdery mildew in the subtelomeric region of the short arm of barley chromosome 7H. Czech J. Genet. Plant Breed. 2013;49(3):95-102. doi: 10.17221/33/2013-CJGPB.
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