Abstract
The genetic effects and the relative contribution of two loci to the level of total alkaloids in burley tobacco (Nicotiana tabacum L.) were determined. The nine genotypes for a two-locus system were developed and evaluated in two environments. Significant additive effects were found at both loci, a dominance effect was significant at one locus, and the additive × additive epistatic effect was significant. All interactions between genetic effects and environments were nonsignificant. The relative dosage effects of the loci were approximately 2.4 to 1.
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