Abstract
Reaction to Ustilago maydis was studied in resistant and susceptible corn inbreds, their F 1 hybrids and F 2 and F 3 segregants. Marked differences among inbreds in genetic prepotency were found. Segregation was polygenic. The concept of combining ability was applied and estimates of σ G (/2) and σ S (/2) were calculated. Both additive and non-additive gene action was found. Breeding for resistance based on crossing to special susceptible testers was suggested.
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