DOI: 10.36347/sjavs.2022.v09i03.003

Pages: 43-48

The paper studies four F1 hybrids obtained by crossing five parental genotypes, four of which are oriental in the role of mother (three of the Prilep type: P-23, P 18-50/4, P 76/86, and one of the Basmak type - MS 8/1) and a large-leaf Burley type (B-1/91) in the role of father, for the traits: yield of green leaf mass per stalk and per hectare, yield of dry leaf mass per stalk and per hectare and yield of seed per plant and per hectare. The experiment was placed on the experimental field at the Scientific Tobacco Institute - Prilep by Random block system in four repetitions for the vegetative period et 2019 and 2020. All appropriate cultural practices were applied during the growing season. The aim of this work was to study the mode of inheritance of stated agronomic traits, to detect heterosis in F1 generation and assess its economic viability. The most common mode of inheritance for the agronomic properties in the F1 generation is the intermediate, then the partial-dominant. In the inheritance of the yield of green and dry leaf mass per stalk, in the two years of investigation there is no occurrence of heterosis, while in the inheritance of the seed yield per plant in all combinations there is the occurrence of positive heterosis. The highest heterotic effect has MS 8/1 x B-9/91. In analyzing the yield of green and dry leaf mass and seeds in tons per hectare, a different vision was obtained, because the calculations are made at different planting distances of genotypes. Thus, for the yield of green leaf higher value than the more productive parent showed P 76/86 x B-9/91, while for the yield of dry leaf higher values than the more productive parents showed P 18-50/4 x B-9/91 and P 76/86 x B-9/91. In terms of seed yield per hectare, hybrids did not exceed the parents. The mode of inheritance of the agronomic traits per stalk indicates a shorter and more reliable successive period of time in the selection activity for the creation of new, superior varieties of toba