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Inheritance of Adult Plant Resistance to Crown Rust in an Accession of Avena sterilis. D. E. Harder, Agriculture Canada, Research Station, 195 Dafoe Road, Winnipeg, Manitoba R3T 2M9; R. I. H. McKenzie(2), and J. W. Martens(3). (2)(3)Agriculture Canada, Research Station, 195 Dafoe Road, Winnipeg, Manitoba R3T 2M9. Phytopathology 74:352-353. Accepted for publication 17 October 1983. Copyright 1984 Department of Agriculture, Government of Canada. DOI: 10.1094/Phyto-74-352.

An accession of Avena sterilis, Canadian Avena (CAV) accession 1387, which originated from Israel, was susceptible in the seedling stage, but resistant in the adult plant stage to six races of Puccinia coronata. Crosses of resistant derivatives of CAV1387 with the susceptible A. sativa lines RL3069 or Sun II resulted in F2 segregation ratios of 1 resistant:2 moderately resistant:1 susceptible plants. It was concluded that the adult plant resistance in CAV1387 was conferred by a single partially dominant gene, designated as Pc-69. This gene confers effective field resistance to the races of P. coronata that occur in western Canada.

Additional keywords: genetics of crown rust resistance, post-seedling resistance.