FIELD PERFORMANCE, HYBRID VIGOR AND ESTIMATION OF SOME OF GENETIC PARAMETERS IN TOMATO (LYCOPERSICON ESCULENTUM MILL.)

Abstract

Seeds of six inbred lines of tomato were planted in the Faculty of Agriculture field, University of Baghdad using full diallel cross to produce 30 diallel and reciprocal hybrids. Seeds of parents, hybrids and control hybrid (Newton) were planted in the field in 2018, using Randomized Complete Block Design (RCBD) with three replicates to study the performance, hybrid vigor and estimating some genetic parameters. A significant differences were found among genotypes (parents and hybrids) for all studied traits. The parents (2 and 4) were superior and gave highest mean in number of fruit per plant, parent 5 was superior in fruit weight, fruit length and fruit diameter. The diallel hybrids (4*5) and (2*3) were superior and gave highest yield and highest hybrid vigor in yield per plant. The reciprocal hybrids (6*4) and (6*2) were superior and gave highest yield per plant, highest fruit weight and highest hybrid vigor. The values of dominance genetic variance were more than the values of additive genetic variance for total yield and yield components, this reflects that the reduction of the values of narrow sense heritability, and on the values of the average degree of dominance which were more than one in all studied traits. While in the reciprocal hybrids the values of additive genetic variance were more than the values of dominance genetic variance in yield and yield components this reflects that the increased of the values of narrow heritability and the reduction of the values of average degree of dominance were less than one.