Heterosis regarding of biological indicators in Virginia tobacco hybrids

Мarina Drumeva-Yoncheva, Yovko Dyulgerski

Abstract: Heterosis activities and degrees of dominance in F1 were examined with regard to plant height, number and size of leaves in Virginia tobacco samples. For the purpose were studied populations of P1, P2, F1 of seven hybrid crosses. The results show that inheritance of plant height is partial dominantly and оverdominantly as in the direction of the parent with higher and in direction of the lower values of researches indicator, and the number of leaves is overdominantly and additive and also is in two directions researches indicator. Inheritance of the length of the leaves is overdominantly or incomplete
dominantly, and the width of the leaves is overdominantly, dominantly and incomplete dominantly. Both indicators are as in the direction of the parent with a large and a small size of the leaves. Heterosis is with economic importance in terms of sizes of leaves, particular at the width of the leaves. This makes it perspective in use in the selection of Virginia tobacco. And in terms of length and in terms of the width of the leaves observed a direct positive relationship between the degree of dominance and manifestations of heterosis.

Keywords: heterosis; number of leaves; plant height; sizes of leaves; Virginia tobacco

Date published: 2017-08-09