Diallel analysis over environments for yield and its attributing traits in tomato (Solanum lycopersicum L.)

Abstract

Forty five F1 hybrids produced in a diallel fashion and their 10 parents were grown in an RBD to generate information on the genetics of yield attributing traits following components of variation and diallel analysis. Components of variation analysis suggested that both fixable and non-fixable gene effects were involved in the inheritance. The component analysis revealed the preponderance of non-additive gene effects in the inheritance of traits. Net dominance effect was significant and positive for most of the traits indicating positive direction of dominance. Positive and significant ‘F’ values for number of primary branches/plant, flesh thickness, number of fruits per plant, average fruit weight and fruit yield/plant indicated positive direction of dominance. Average degree of dominance was more than unity in all the traits indicating over-dominance. Non-significant values of t2 and deviation of regression coefficient from unity depicted the absence of epistasis for all the traits in all the environments and pooled analysis.