Heritability of common root rot and spot blotch resistance in barley
1994
Kutcher, H.R. | Bailey, K.L. | Rossnagel, B.G. | Legge, W.G.
Heritability of resistance to common root rot and spot blotch [Cochliobolus sativus] was investigated in two resistant-by-susceptible barley crosses. Parental cultivars, F1s and progeny lines were evaluated for common root rot reaction in a field disease nursery in four experiments and for spot blotch reaction in two growth chamber experiments. The heritability of common root rot resistance of cross Fr926-77 X Deuce ranged from 56 to 85%. Heritability for spot blotch resistance in this cross was 43 and 61%. For the cross Virden X Ellice, heritability for common root rot resistance ranged from 53 to 78%, and heritability for spot blotch resistance was 73 and 78%. Common root rot resistance appeared to be conditioned by dominant genes in Virden X Ellice, but the genetic basis of the resistance could not be determined for Fr926-77 X Deuce. The continuous nature of the distributions of mean disease reactions of progeny lines and estimation of the number of genes conditioning resistance indicated that inheritance of resistance for both diseases was quantitative in nature. No association between common root rot reaction and spot blotch reaction was detected.
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