Inheritance of Partial Spot Blotch Resistance in Barley

Barley spot blotch, caused by Cochliobolus sativus, is an important barley disease which causes extensive grain yield losses. . In order to understand the inheritance of resistance to the disease, an experiment was conducted using seven barley genotypes in partial diallel crosses. Parents and F1 crosses were planted in a randomized complete block design (RCBD) with three replicates. The severity of disease was recorded as the first signs of disease and then AUDPC was calculated. D and H components showed that both additive and dominance effects are effective in controlling the traits. Dominant alleles led to a reduction in the severity of disease and increased resistance to spot blotch disease. 67/110 and sahra genotypes have negative GCA and can take advantage of them as promising parents in breeding programs for resistance to the disease.