Abstract
Results from inoculated F1, F2, and F3generations of diallel crosses between five resistant varieties and one susceptible variety of barley (Junior) indicated that four different genes for resistance to Ustilago hordei were involved. A dominant gene for resistance appears to be common to Titan, O.A.C. 21, Ogalitsu, and Anoidium. Anoidium carries a second dominant gene for resistance (designated Uk2), Ogalitsu an additional recessive (designated uh3), and Jet, a single recessive (designated uh4). Interpretation of the results was complicated by skewed F2and F3distributions resulting from seedling mortality of severely infected plants. Chi-square tests for independence of morphological characters indicated that a gene for awn barbing is located in linkage group I. No association was found between inheritance of covered smut reaction and inheritance of number of kernel rows, lemma teeth, lemma and pericarp colour, hull adherence, aleurone colour, awn barbing, length of rachilla hairs, or rachis pubescence.
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