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Inheritance of Resistance to Southern Corn Rust in Maize Populations¹

To obtain information on the type of gene action and number of genes for resistance to Puccinia polysora Underw. in a number of corn (Zea mays L.) populations, we evaluated F₂ progenies from crosses between homozygous resistant selections and a common susceptible tester. In other studies with resistant selections, we conducted allele tests to determine if genes for resistance were at the Rpp₉ locus. Analysis of our data indicated that either a one or two gene model would explain the F₂ ratios obtained. The type of gene action involved included complete, partial, or no dominance. All five selections evaluated were found to have a gene for resistance at, or very closely linked with, the Rpp₉ locus.

Key Words: Corn • Zea mays L. • Disease resistance • Allele test • Gene action

² Research agronomist, USDA-ARS and professor of agronomy; research plant pathologist, USDA-ARS, and associate professor of plantpathology, Mississippi. State Univ., and former graduate . student (present address: Jimmy Sanders Seed Co., Cleveland, Miss.), respectively.

Received for publication April 11, 1983.