Inheritance of yield components in diallel crossing of divergent genotypes (Solanum melongena L.)

The aim of this study was to determine the mode of inheritance, the combining ability and the components of genetic variance for fruit weight and fruit number per plant in five divergent eggplant genotypes. The investigation was based on data from the F1 generation. Testing of mean values of the F1 generation in relation to parents showed that the most frequent mode of inheritance was partial dominance. In most hybrids, partial dominance was estimated as the mode of inheritance for both characters. The analysis of components of genetic variance for yield components has showed that the main part of genetic variance belongs to the additive gene effect. The high values of heritability indicated a more important role of additive genes. It can be concluded that selection of genotypes with high average values for fruit weight and fruit number per plant could be a way for the improvement of eggplant breeding

Genetic analysis of earliness in pepper hybrids (Capsicum Annuum L.)

We investigated the combining ability, genetic effects and the mode of inheritance of earliness in diallel crossings of 5 divergent pepper genotypes,. The time period from the initial stage of emergence to the initial stage of flowering was used as the earliness indicator. The combining ability was calculated by applying Griffing (1956) method 2, model 1, and the analysis of genetic variance was carried out using Hayman (1954) and Jinks (1956) method, while regression analysis was done using Mather and Jinks method (1971). We tested the mean values of F1, generation comparing them with parental mean values in order to estimate the overdominance and dominance of an early ripening parent. The variance analysis of combining ability showed highly significant differences in the general combining ability (GCA) and in the specific combining ability (SCA). The analysis of the components of genetic variance suggested that the main part of the variance concerning the earliness belonged to the dominant component and that the dominant alleles prevailed over the recessive ones. On the basis of the mean degree of dominance and the data obtained from regression analysis, it can be said that overdominance was the mode of inheritance of the earliness trait in all crossing combinations