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Inheritance of resistance in barley to several physiologic races of the scald fungus



Inheritance of resistance in barley to several physiologic races of the scald fungus



Canadian Jour Genet And Cytol 3(2): 153-164



The genetics of resistance to races U. S. -1, U. S.-7, U. S.-8, and U. S.-9 of the fungus Rhynchosporium secalis, cause of scald in barley, was investigated in eight barley varieties. The scald reactions were classified into 5 types, 0 to 4, where type O was completely resistant and type 4 was fully susceptible. Five genes were identified, all dominant in their action. The barley varieties Atlas and Atlas 46 possessed the Rh2 gene which conditioned a type 1 reaction to race U.S. -1 and a type 2 reaction to U. S. -7 of R. secalis. In addition to the Rh2 gene, Atlas 46 had the Rh3 gene, which conditioned a type O reaction to races U. S.-1, U. S.-7, and U. S.-8. The varieties Turk and possibly Brier also possessed the same gene. A third gene, Rh4, conditioning a type O reaction to races U. S.-7, U. S.-8, and U. S.-9, was present in La Mesita, Trebi, and Osiris. This gene was closely linked with the Rh3 gene, with a recombination value of 1.0 [plus or minus] 0.78 percent. Modoc carried the Rh42 gene, an allele at the Rh4 locus, which conditioned a type O reaction to races U. S.-8 and U. S.-9 and a type 1 and type 2 reaction to races U. S.-l and U. S.-7, respectively. A gene, Rh5, conditioning a type 2 reaction to race U. S.-8, was present in Turk; it was independent of the Rh3 and Rh4 genes.

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Accession: 014082370

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DOI: 10.1139/g61-019


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