O. SrideviA. Usha2016-11-122016-11-122011http://krishikosh.egranth.ac.in/handle/1/85257A field experiment was conducted to study heterosis and combining ability for yield and yield contributing traits and inheritance pattern of bacterial will resistance in tomato (Solanum lycopersicon Mill.). The experiment was conducted at Agriculture College, University of Agricultural Sciences, Dharwad. Forty-two crosses were developed by crossing three females with fourteen males following line x tester design. Variance due to the parents and crosses were found significant for all the yield and yield related components, except number of branches and fruit diameter for crosses. The line x tester analysis revealed that no single line or tester is superior for all the traits under consideration. Nevertheless, male parent CLN2777A exhibited high per se performance for plant height, number of branches per plant, average fruit weight and pericarp thickness, while CLN2123E exhibited highest per se performance for total fruit yield per plant. Maximum standard heterosis for total yield per plant was observed in the cross Pusa Ruby x CLN2777A followed by Megha x CLN2768A and Megha x CLN2777F. While the hybrid Megha x CLN2777F showed significant standard heterosis for plant height, number of branches, number of fruits per plant, fruit length, fruit weight and pericarp thickness. The cross Megha x CLN2768A exhibited significant sca effect for fruit yield traits like total fruit yield per plant, days to 50 per cent flowering, number of fruits per plant and fruit quality traits like fruit length, TSS and ascorbic acid. It also exhibited recorded standard heterosis over all three checks Namdhari 2535, Maharani and MHTM-256 for total fruit yield per plant, while Megha x CLN2777F recorded significant sca effect for fruit length and ascorbic acid content. All the potential lines used for screening were identified as resistant to bacterial wilt while all testers Pusa Ruby, Megha and DMT-2 were found to be susceptible. Two F2 populations Pusa Ruby x CLN2777A and Pusa Ruby x CLN2400B used for screening resistance for bacterial wilt exhibited 15:1 ratio indicating resistance to bacterial wilt is governed by two duplicate genes.Genetics and Plant BreedingThesis