Abstract
Plants derived from a cross between the oat cultivar Kyto (Avena sativa L.) and A. sterilis L. were highly resistant to oat stem rust (Puccinia graminis Pers.) in the adult plant stage. This resistance was much superior to that of either parent. This is the first example of transgressive segregation in this host-parasite system. The genetic mechanism of this resistance is not completely understood but the resistance appears to be conferred by gene Pg-12 from Kyto interacting with a second gene. An alternate hypothesis is that a suppressor gene in Kyto prevents the resistance conditioned by Pg-12 from being expressed in the adult plant stage. This type of resistance is highly effective against all but two of the oat stem rust races known to occur in North America.
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