Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 9:124-127 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Epistasis in Maize (Zea mays L.) I. F1 Hybrids and Their S1 Progeny1

C. W. Stuber and R. H. Moll2

Interpopulation single crosses (F1's) and the progenies from one generation of selfing (S1's) arising from 128 unselected lines (64 from the maize variety ‘Jarvis Golden Prolific’ and 64 from the variety ‘Indian Chief’) were evaluated to determine the importance of epistasis. Significant epistatic effects were detected in some specific sets of crosses. However, the amount of the total variability that could be attributed to epistasis was, on the average, less than 10%. These and earlier results suggest that epistasis may be important in unique genetic combinations but these combinations occur either too infrequently or with such limited effect that they are not detectable in random mating equilibrium populations.

Key Words: Genetic effects • Genetic variances • Varietal hybrids

1 Contribution from the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the Department of Genetics, North Carolina Agricultural Experiment Station, Raleigh 27607, cooperating. Paper No. 2644 of the Journal Series. The work was supported in part by Public Health Service Research Grant GM11546. The computing was supported in part by NIH Grant FR-00011.

2 Research Geneticist, Crops Research Division, ARS, USDA, and Professor of Genetics, respectively.

Received for publication June 1, 1968.




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