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Genetic Variability in Flue-Cured Varieties of Nicotiana tabacum. II. Dixie Bright 244 x Coker 139¹

In the F₂ generation of a cross between two flue-cured tobacco varieties, additive genetic variance was the predominant genetic variance for percent total alkaloids, yield, flower, leaves, and suckers. For value per acre and plant height, there was evidence of nonadditivity, which could not be resolved between dominance and epistasis. Most additive genetic correlations among yield, height, flower, and leaves were positive and significant. Number of suckers was negatively correlated with all traits except value. Yield and percent total alkaloids were negatively correlated. The gain predicted from one cycle of selection by intercrossing the top 12.5% of the full-sib families for total alkaloids was 21% above the mean of the full-sib families. An expected correlated response was a decrease of 87 pounds yield per acre.

² Professors of Genetics and Professor of Experimental Statistics.

Received for publication May 19, 1966.