Inheritance of resistance to Pyrenophora teres f. teres in spring barley |
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| Authors: | R Jonsson T Säll T Kraft M Gustafsson |
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| Institution: | Department of Plant Breeding Research, The Swedish University of Agricultural Sciences, S-268 31 Svalöv, Sweden (present address: Cereal Breeding Department, Svalöf Weibull AB, S-268 81 Svalöv, Sweden);Department of Genetics, University of Lund, S_112 51 Lund, Sweden;Department of Plant Protection Sciences, The Swedish University of Agricultural Sciences, S-230 53 Alnarp, Sweden |
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| Abstract: | The inheritance of seedling resistance to a Swedish isolate of Pyrenophora teres f. teres was investigated in four resistance sources of spring barley. Accessions CI 2330, CI 5791, CI 5822 and CI 9779 were used as resistance sources, and the cultivar ‘Alexis’ was used as a susceptible parent in different crosses. From the disease reaction in the F1, F2 and F3 generations it was concluded that the resistance was governed by the same two complementary genes in CI 5791, CI 822 and CI 9776. One of these genes was present in CI 2330. The first three cultivars were highly resistant to the isolate used in this investigation. These results, when combined with earlier studies, suggest that CI 5791, CI 5822 and CI 9776 may be of great value as sources of resistance to barley net blotch. Spearman's rank correlation between the disease reaction of F2 plants and their F3 progeny was highly significant (r = 0.75; P ≥ 0.001) It is suggested that selection in the F2 generation is effective. In a backcross breeding scheme, single plant reactions in F1 or F2 need to be confirmed in later generations. |
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| Keywords: | Hordeum vulgare Pyrenophora teres Drechslerateres inheritance of resistance |
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