Trisomic analysis of genes for resistance to scald and net blotch in several barley cultivars

Abstract

Barley cultivars Kitchin (C.I. 1296) and Jet (C.I. 967), resistant to scald (incited by Rhynchosporium secalis (Oud.) Davis), and cultivars Tifang (C.I. 14373), C.I. 9819, and C.I. 7584, resistant to net blotch (incited by Pyrenophora teres Drechs.), were crossed to the primary trisomics in the cultivar Betzes. F2 segregation ratios were studied to determine chromosomal location of the resistance genes. Kitchin was found to contain a single scald-resistance gene, Rrs9, on chromosome 4. Jet contained scald-resistance genes rrs1 and rrs6 on chromosomes 3 and 4, respectively. Tifang contained a single gene, Rpt1a, for net-blotch-resistance on chromosome 3. C.I. 7584 contained a single net-blotch-resistance gene, Rpt3d, on chromosome 2. C.I. 9819 contained net-blotch-resistance genes Rpt1b and Rpt2c on chromosome 3 and 5. Some uses of this information are discussed.