Abstract
The genetics of virulence of two Ustilago hordei (Pers.) Lagerh. races were examined on the resistant barley cultivar Trebi. Tetrad analysis was used to identify segregation patterns. The segregation patterns from the F1 teliospores revealed a single major gene for virulence with high levels of smut inherited as a dominant trait. Parents T1 and T4 were identified as homozygous dominant and homozygous recessive, respectively. Analysis of the F1 teliospores also revealed variation that could not be accounted for by either a one- or two-gene hypothesis. Further analysis of selected sporidia indicated that several genes modified the effects of the major gene.
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