The inheritance of resistance to Puccinia coronata and of floret characters in Avena sterilis

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Abstract
The inheritance of resistance to P. coronata, awn development, lemma pubescence and lemma color were studied in the A. sterilis accessions CAV 4248, CAV 4656 and CAV 4904. Three independent, partially dominant genes (Pc-64, Pc-65, Pc-66) in CAV 4248, 1 partially dominant gene (Pc-67) in CAV 4656, and a dominant gene (Pc-68) in CAV 4904 were identified which conferred resistance to P. coronata. Genes Pc-64, Pc-65, Pc-66, Pc-67 and Pc-68 conferred resistance to 13, 8, 6, 12 and 14 races, respectively, of the 14 races of P. coronata tested. Gene Pc-68 conferred resistance to all field isolates of P. coronata collected in Canada in 1981 and was closely linked or allelic to gene Pc-46. Awns and lemma pubescence were inherited monogenically in crosses with all 3 CAV accessions. Gray lemma color was controlled by 1 gene in CAV 4248 and by 2 genes in CAV 4656. Brown lemma color was controlled by 1 gene, which was closely linked or pleiotropic with the gene for lemma pubescence in CAV 4904. There was no association between crown rust resistance and the 3 floret characters studied.