The genetic basis of scald resistance in western Canadian barley cultivars |
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| Authors: | G A Penner A Tekauz E Reimer G J Scoles B G Rossnagel P E Eckstein W G Legge P A Burnett T Ferguson J F Helm |
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| Institution: | (1) Agriculture and Agri-Food Canada, Winnipeg Research Centre, 195 Dafoe Road, R3T 2M9 Winnipeg, Manitoba, Canada;(2) Department of Crop Science and Plant Ecology, University of Saskatchewan, 51 Campus Dr., S7N 5A8 Saskatoon, Saskatchewan, Canada;(3) Crop Development Centre, University of Saskatchewan, 51 Campus Dr., S7N 5A8 Saskatoon, Saskatchewan, Canada;(4) Agriculture and Agri-Food Canada, Brandon Research Centre, P.O. Box 1000A, R.R. #5, R7A 5Y3 Brandon, Manitoba, Canada;(5) Agriculture and Agri-Food Canada, Lacombe Research Centre, Bag Service #5000, TOC 1SO Lacombe, Alberta, Canada;(6) Alberta Wheat Pool, Box 2700, T2P 2P5 Calgary, Alberta, Canada;(7) Field Crop Development Centre, Alberta Agriculture, Bag Service, #47, TOC 1SO Lacombe, Alberta, Canada |
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| Abstract: | Summary The genetic basis of resistance to scald (Rhynchosporium secalis) within barley breeding populations is poorly understood. The design of effective genetically based resistance strategies is predicated on knowledge of the identity of the resistance genes carried by potential parents. The resistance exhibited by a broad selection of western Canadian barley lines was investigated by evaluating their reactions to five R. secalis isolates. Results were compared to the resistance exhibited by previously characterized lines. This comparison, combined with pedigree analysis indicated that there are two different resistance genes present inwwestern Canadian cultivars. These genes were shown to be independent through analysis of a segregating population derived from a cross between Falcon and CDC Silky. This evidence, along with observed linkage of the gene in CDC Silky with an allele specific amplicon developed for a Rhynchosporium secalis resistance locus on chromosome 3, provides evidence that the gene in Falcon is the Rh2 gene derived from Atlas, and the gene (s) in CDC Silky is located within the Rh/Rh3/Rh4 cluster and is similar to the Rh gene in Hudson. |
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| Keywords: | marker-assisted selection genetics barley Hordeum vulgare scald Rhynchosporium secalis Canada |
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