Inheritance of important quantitative signs in hybrid combinations Burley tobacco

Yovko Dyulgerski

Abstract: The way of inheritance, the coefficient of heritability, the manifestations of heterosis, transgression and depression in terms of the height of the plants and the number of leaves in hybrid combinations Burley tobacco are established. For that purpose are studied, the Р1, Р2, F1 and F2 populations of eight crosses Burley tobacco. The obtained results suggest that inheritance of the height of plants is overdominantly or incompletely dominantly, in the direction of the parent with both higher values and lower values. Inheritance of the number of leaves is overdominant in the direction of the parent with higher values, or incompletely dominant in the direction of the one with lower values. The manifestations of heterosis and transgression are of economic importance only in terms of the number of leaves. The minimal number of genes controlling the manifestation of the studied indicators is higher at plant height than the number of leaves. Due to low to medium values of the heritability coefficient obtained for both indicators, it is found that the environmental conditions have a stronger influence than the genotype on the manifestation of the traits plant height and number of leaves This suggests an effective selection in later hybrid generations for both studied parameters. The direction of hybridization influences the inheritance of the height of plants and the number of leaves.

Keywords: Burley tobacco; height of plants; hereditability; heterosis; hybridological analysis; inheritance; number of leaves

Date published: 2023-04-26