Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 11:328-331 (1971)
© 1971 Crop Science Society of America
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Ear Height Inheritance Estimates and Linkage Bias Among Generation Means of Corn1

D. L. Thompson, W. D. Hanson and A. W. Shaw2

Variability of generation means for ear height of corn (Zea mays L.) was partitioned into additive, dominance, and epistasis for ll populations involving 3 groups that cover a broad range of parental differences. Additive and dominance parameters accounted for an average of 90% of the variability. Dominance was the principal component. Mean squares for dominance were similar among populations within groups; therefore, we concluded that the number of segregating loci did not differ appreciably among crosses in groups; that cancelling of additive effects occurred; and that additive effects were probably as important as dominance effects. The amounts of total variability estimated for additive effects were proportional to the ear height differences between parents. Linkage bias was calculated to be negligible in the generation mean analysis, if the linked loci involved two or more separate linkage groups in the expression of a character.

Key Words: Additive • Dominance • Epistasis • Generation mean analysis

1 Contribution from the Plant Science Research Division, Agricultural Research Service, U. S. Department of Agriculture and the Crop Science and Genetics Departments, North Carolina Agricultural Experiment Station, Raleigh, North Carolina. Published with the approval of the Director of Research as paper number 3049 of the Journal Series of the North Carolina State University Agricultural Experiment Station. Raleigh, North Carolina.

A portion of the data reported herein were from a Special Research problem submitted by the junior author in partial fulfillment of the requirements for the Master of Agriculture degree conferred by North. Carolina State .University at Raleigh, January, 1964. A portion of the computations was accomplished by a facility supported in part by the National Institutes of Health Grant NO. Fr-0011.

2 Research Agronomist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture; Professor of Genetics; and former graduate assistant, respectively, North Carolina State University, Raleigh, N. C.

Received for publication May 18, 1970.




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