Abstract
The minimum number of Pc genes for resistance to oat crown rust (Puccinia coronata var. avenae) was determined from infection-type data based on the interactions of several oat lines and 47 isolates of crown rust from the Iowa State University collection. Infection-type data from seedlings of seven diploid oat accessions, a hexaploid chromosome addition line (X117), and its recurrent parent (C649), were evaluated in reference to 33 differentials to determine low or high infection type. At least 17 unique crown rust resistance genes can be detected in the hexaploid differentials with the Iowa State University crown rust collection. Four additional resistance genes can be detected among the diploid accessions (.)
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