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Published in Crop Sci 7:631-636 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inbreeding in Two Populations of Zea mays L.1

C. F. Sing, R. H. Moll and W. D. Hanson2

Inbreeding effects on five characteristics of two Zea mays varieties were estimated. Seven inbred subpopulations, ranging from F = O to 9/16, of each variety were obtained by using double-double (8-line) pedigrees. Environmental error and genotype-by-environment interaction components of variance were not significantly affected by the level of inbreeding. The regression of performance on expected inbreeding was linear for yield, number of days to tassel, ear height, and plant height. If epistatic effects are contributing to the variability in these two populations they must be of the type which lead to a linear relationship between average performance and inbreeding. Inbred progenies derived from sets of inbred lines were analyzed separately. Variability in response to inbreeding among such sets of genetic material was detected.

1 Published with the approval of the Director of Research as Paper No. 2423 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh, North Carolina. The research was supported in part by NIH Grant No. 11546-01 and by the National Institutes of Health Research Training Grant 2 Tl GM296. The computing was provided by NIH Grant FR 00011. Submitted by the senior author in partial fulfillment of requirements for the Ph.D. degree.

2 Research Associate, Department of Human Genetics, University of Michigan, and Professors of Genetics, North Carolina State University at Raleigh, respectively.

Received for publication June 15, 1967.


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