Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 11:275-279 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Diallel Crosses Among Burley Varieties of Nicotiana tabacum L. in the F1 and F2 Generations1

D. F. Matzinger, E. A. Wernsman and H. F. Ross2

Burley F1 hybrids averaged 9.8% more yield than the parent varieties combined over 2 years. Heterosis was also expressed for increased total alkaloids, taller plants, more leaves, and larger leaves. Estimates of genetic variances indicated that additive genetic variance predomnated in the combined analysis. However, large genotype X year interactions existed for measures of heterosis and for estimates of genetic variances. These interactions were so large for yield that neither variance of general combining ability nor specific combining ability was significant in the combined experiments. Hybrids showing greatest heterosis and largest yield did not generally arise from the highest yielding parents per se. Variances arising from maternal and reciprocal effects were negligible.

Key Words: Genetic variability • Heterosis • Inbreeding depression • Maternal effects • Hybrid tobacco • Alkaloids

1 Paper number 3302 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh, N. C. This investigation was supported in part by Public Health Service Research Grant GM 11546 from the Division of General Medical Sciences. The support for computing was provided by the National Institutes of Health Grant FR-00011.

2 Professor of Genetics, Associate Professor of Crop Science, and Extension Assistant Professor of Crop Science, North Carolina State University, Raleigh, N. C. 27607.

Received for publication October 14, 1970.




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