Abstract

Three selected inbred lines were intercrossed and topcrossed to a known resistant (NC250) and a known susceptible (B73) inbred. Several sources of resistance roughly equivalent to the high level of resistance available from NC250 were identified. Inheritance studies suggest that different genetic systems are involved, with a range of additive and recessive types of gene action. Resistance in these sources appears to be controlled by relatively few genes that combine in a positive epistatic fashion with the resistance genes in NC250

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