Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 22:1213-1218 (1982)
© 1982 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Direct and Maternal Genetic Variances and Covariances of Seedling Characters in Tobacco1

D. A. Van Sanford and D. F. Matzinger2

A diallel crossing scheme was used to estimate genetic parameters for seedling weight, root length, and day of germination in a random mating tobacco (Nicotiana tabacum L.) synthetic population. Estimates were obtained from plants grown under two nutrient levels in aseptic culture in controlled environmental growth chambers. Significant estimates of direct additive and dominance variances and, maternal additive variance for seedling weight were obtained in both stress and optimal nutrient levels. The heritability for seedling weight in the optimal environment, 0.178, was larger than that in the stress environment, 0.124. Predictions of selection response were greater for performance on either the stress or optimal nutrient level if selection would be conducted in the optimal environment. Correlations among characters varied between the two nutrient levels. The large correlations between seedling fresh weight and root length for direct additive and maternal additive effects were of opposite sign, leading to prediction of little change in root length when selecting for increased seedling weight.

Key Words: Tobacco • Heritability • Recurrent selection • Correlated response • Genotype x environment interaction • Germination • Diallel analysis

1 Paper number 8121 of the journal series of the North Carolina Agric. Res. Serv., Raleigh, N.C. This research was supported in part by a grant from the North Carolina Tobacco Foundation, Inc.

2 Former graduate student (now assistant professor of agronomy, Univ. of Kentucky) and professor of genetics, North Carolina State Univ., Raleigh, NC 27650.

Received for publication December 28, 1981.




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Copyright © 1982 by the Crop Science Society of America.