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Diallel Analysis of Resistance of Corn (Zea mays L.) to Corn Stunt¹

A diallel analysis was used to evaluate 45 single crosses (10 inbred lines) of maize (Zea mays L.) for resistance to corn stunt. Using a corn stunt rating scale of 1 (healthy) to 6 (dead plants), the R x R crosses had a mean corn stunt rating of 1.6. The R x S and S x S crosses had a mean rating of 2.4 and 3.5, respectively. Mean yields of 3,205, 2,754, and 2,538 kg/ha were produced by the R x R, R x S, and S x S crosses, respectively. General combining ability for corn stunt ratings was highly significant in all experiments and was much larger than specific combining ability. Thus, additive gene action appears to be much more important than dominance gene action in the inheritance of resistance to corn stunt in this material.

Key Words: Combining ability • Genetics • Disease • Maize

² Assistant Agronomist, Mississippi State University, State College, Miss. (presently at the Georgia Experiment Station) and Research Agronomist, ARS, USDA, respectively.

Received for publication December 20, 1971.