INHERITANCE OF VIRULENCE IN OAT STEM RUST ON THE VARIETIES SEVNOTHREE, RICHLAND AND WHITE RUSSIAN

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Abstract
Selfing and crossing studies with 10 cultures of oat stem rust, Puccinia graminis Pers. f.sp. tritici Erikss. and Henn., indicated that single recessive genes governed virulence on each of the varieties Richland and White Russian that carry resistance genes A and D, respectively. Virulence on Sevnothree was inherited in a more complex manner. A dominant gene for virulence and a dominant gene that acts with maternal cytoplasm to reverse the dominance of virulence were hypothesized to explain virulent and avirulent cultures from reciprocal crosses and a ratio of 10 virulent: 6 avirulent from the selfing of a culture of race 6A. The same hypothesis explained segregation in the progenies from selfing 2 cultures derived from the race 6A.