INHERITANCE OF PER CENT TOTAL ALKALOIDS IN<i>NICOTIANA TABACUM</i>L. II. GENETIC EFFECTS OF TWO LOCI IN BURLEY 21 × LA BURLEY 21 POPULATIONS

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.