ASSOCIATION OF TWO GENES FOR SCALD RESISTANCE WITH A SPECIFIC BARLEY CHROMOSOME

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Abstract
The association of two closely linked genes, Rh3 and Rh4, conditioning resistance to several races of the scald fungus Rhynchosporium secalis, with various genetic markers and interchange stocks has been investigated. Atlas 46, possessing the Rn3 gene, was crossed to a series of seven interchange stocks. Linkages observed with points of interchange in T2-3c and T3-6d were 1.7 [plus or minus] 0.99 and 4.9 [plus or minus] 1.76% , respectively. Both genes were linked with genetic markers from linkage group 3. The Rh3 gene was linked with a gene conditioning spike density (1), with a recombination value of 14.0 [plus or minus] 1.56%, and was closely linked with a gene for streaked seedlings (st); Rh4 was associated with a xantna seedling character (x) with an estimated recombination value of 11.2 [plus or minus] 1.21%.

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