Diallel Analysis of Stalk Quality Traits in Twelve Inbred Lines of Maize
1972
Loesch, P. J.
Sixty-six inter se F₁ crosses among 12 inbred lines of corn (Zea mays L.) were evaluated in two years at two locations. The inheritance of eight stalk traits was determined by means of diallel analysis. Significant differences among the 66 F₁ hybrids were obtained in each trait. General combining ability (gca) and specific combining ability (sca) mean squares were statistically significant nearly every instance. The gca mean square was usually much larger than the sea mean square. Genotypic correlation coefficients between large stalk diameter and crushing strength, weight of stalk and crushing strength, and rind thickness and crushing strength were .72, .88, and .60, respectively. Weight of stalk section appears to be well suited for rapid screening purposes, whereas stalk density appears to be a poor trait to employ in a selection program. for the material studied, selection for high crushing strength will likely result, on the average, in strains characterized by increased size of stalk, weight of stalk, and thickness of rind. Selection procedures recommended for populations involving the lines tested were those which are effective in utilizing both the additive and nonadditive genetic variability.
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