Abstract
Previous genetic analysis of Ustilago hordei (Pers.) Lagerh. indicated that virulence was modified by polygenes. The analysis was extended in this study to include examination of this variation on both the susceptible barley cultivar Odessa and the resistant cultivar Trebi. Generally, higher percentages of smutted plants were observed on 'Odessa' than on Trebi'. The rankings of dikaryons were similar on both cultivars and correlations of rankings of dikaryons between cultivars were statistically significant (rs = 0.875 and rs = 0.78). Interactions between haploid genotypes also were observed which greatly enhanced the percentage of smutted plants. Rather than virulence being dominant as reported in the previous analysis, all segregation patterns from these experiments indicated that virulence was recessive.
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