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Genetic Variability in Flue-Cured Varieties of Nicotiana tabacum L. III. SC58 x Dixie Bright 244¹

Full-sib and self progenies obtained from parent plants in the F₂ generation of a cross of two varieties of Nicotiana tabacum L. were evaluated for relative amounts of additive genetic, dominance, and additive x additive epistatic variances. Significant estimates of additive genetice variance were obtained for yield, alkaloids, plant height, number of leaves, leaf length, leaf width, and number of leaf axil suckers. None of the estimates of dominance variance were significant. A significant estimate of additive x additive epistatic variance was obtained for plant height. Positive genetic correlations were obtained among most of the growth characters. There was a large negative correlation between yield and total alkaloids, –.85. Value of tobacco leaf was not correlated with growth characters or with total alkaloids.

Key Words: genetic variances • genetic correlations • heritabilities • tobacco • alkaloids

² Professor of Genetics, North Carolina State University, Raleigh, N. C. 27607.

Received for publication June 10, 1968.