Degree of inheritance and heritability of yield in parental genotypes and F1 hybrids of tobacco

Abstract

The mode and level of inheritance of green and dry mass yield per stalk were investigated in four parental genotypes (Burley - B 2/93, Suchum - S1, Suchum - S2 and Prilep - P-84) and in their six diallel F1 hybrids. The trial was set up in 2007, 2008 and 2009 in the field of Tobacco Institute-Prilep in a randomized block design with four replications. The aim of the investigation was to estimate the heritability as an indicator of the inheritance of the yield as one of the most important quantitative characters of tobacco, in order to give suggestions for the selection of parental genotypes and directions for the creation of new varieties. The mode of inheritance was estimated according to the test - significance of the mean value of F1 progeny compared to the parental average. Narrow-sense heritability was estimated after Allard (1960), while broad-sense heritability and genetic components were estimated after Mather and Jinks (1974). The mode of inheritance in the hybrids was different. Positive heterosis for green and dry mass yields per stalk was recorded in S1 x S2. Negative heterosis for green mass yields per stalk was recorded in S1 x P-84 and S2 x P-84, while for dry mass yield it was recorded in S1 x P-84. Inheritance of the characters during the three years of investigation was identical. The higher heritability index of both types was recorded for dry mass yield. As regards inheritance of the yield, the values of broad-sense heritability were higher than those of narrow-sense heritability.

Keywords

• tobacco
• heredity
• green and dry mass yield per stalk
• heterosis
• narrow-sense and broad-sense heritability (h2)