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Genetic Parameters in Burley Populations of Nicotiana tabacum L. I. ‘Ky 10’ x ‘Burley 21’¹

In the F₂ generation of a cross between two burley varieties of Nicotiana tabacum L., additive genetic variances were significant for days to flower, plant height, number of leaves, leaf length, leaf width, yield, and total alkaloids. All estimates of dominance and additive x additive epistatic variances were negative or nonsignificant. Heritabilities were low and estimates of additive genetic and phenotypic correlations between pairs of agronomic characters were positive. The six agronomic characters were negatively correlated with total alkaloids.

Key Words: Genetic variances • Heritabilities • Genetic correlations

² Research Geneticist, Agricultural Research Service, U. S. Department of Agriculture and Associate Professor of Agronomy, University of Kentucky, Lexington, Kentucky 40506.

Received for publication October 12, 1970.