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Published in Crop Sci 12:261-264 (1972)
© 1972 Crop Science Society of America
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Diallel Analysis of Stalk Quality Traits in Twelve Inbred Lines of Maize1

P. J. Loesch, Jr.2

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.

Key Words: General combining ability • Genotypic correlation coefficient • Crusing strength • Stalk lodging • Genetic effects

1 Contribution of Plant Science Research Division, Agricultural Research Service, Department of Agriculture and the Department of Agronomy, University of Missouri Agricultural Experiment Station at Columbia, Journal Series No. 6181.

2 Geneticist, Plant Science Research Division, Agricultural Research Service, U. S. Department of Agriculture and Associate Professor, Univ. of Missouri, Colombia, Missouri 65201.

Received for publication April 8, 1971.




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