Half Diallel Analysis of Some Quantitative Traits in Tomato under Drought Stress Conditions.

The present experiment was performed to classify best combiner parents and cross combinations for developing hybrids for quality components in tomato under drought stress (DS) compared with irrigated control (I), using half diallel analysis for six parents and their fifteen hybrids. The parental genotypes are Solanum  pimpenillifolium (LA:411) and five cultivated genotypes Solanum lycopersicum, i. e. , Edkawi ,  Super  Marmande  ,  Super Strain B, Castle Rock  and Peto 86 for some characters, i. e. , length of fruit (cm), fruit diameter (cm), fruit shape index, locules number, average fruit weight (g),fruit flesh thickness (cm), fruit firmness (g/_3mm), and total soluble solid (brix). The results indicated that heterosis over mid parent gave significant values in most crosses, i. e. , the hybrid Edkawi ×Super Marmande for length of fruit (cm), fruit shape index, fruit flesh thickness (cm) and fruit firmness (g/_3mm) and the hybrid Edkawi×Super Strain B for fruit diameter (cm), locules number,fruit flesh thickness (cm) and average fruit weight (g). Also, these hybrids showed high values for specific combining ability (SCA). Based on the general combining ability (GCA) effects, the best combiners  were the parental genotypes LA411 for total soluble solid, Edkawi for fruit diameter (cm), locules number and average fruit weight (g) and Super Strain B for length of fruit (cm), fruit shape index andfruit firmness (g/_3mm) .