R.V. PatilGurubasavaraj K.2016-11-122016-11-122011http://krishikosh.egranth.ac.in/handle/1/85228An investigation was conducted in the Department of Horticulture, College of agriculture, Dharwad to study the heterosis and combining ability in tomato (Solanum lycopersicum L.) with the objectives of identifying good general combiners and to assess the magnitude of heterosis for sixteen characters and isolation of economic segregants in double cross F5 population. Among 18 hybrids, three crosses DTHVI-5 (12-1) × DTH5N-3 (4-8) (1528g), DTHVI-5 (12-13)×DTH5N-3 (4-8) (1493.17g) and DTHVI-5 (12-11) × DTH5N-3 (4-8)} (1411.59g) expressed considerable magnitude of heterosis for yield. Hybrids DTHVI-5 (12-1) × DTH5N-3 (4-8), DTHVI-5 (12-13) × DTH5N-3 (1-12) and DTHVI-5 (12-13) × DTH5N-3 (4-8) had high fruit weight 66.63g, 57.53g and 57.00g respectively. None of the hybrids had significant positive heterisis over commercial check for yield. DTH5N-3 (4-8) was better yielding among the three testers (1441.97g). Significantly good GCA was observed in lines DTH5N-3 (4-8) (162.03) for yield per plant and number of fruits per plant, DTHVI-5 (12-1) (5.17) and DTH5N-3 (4-8) (3.76) for fruit weight. The top three crosses DTHVI-5 (12-1) x DTH5N-3 (4-8), DTHVI-5 (12-13) x DTH5N-3 (1-12) and DTHVI-5 (12-1) x DTH5N-3 (4-15) exhibited high SCA effects for total yield per plant. The cross DTHVI-5 (12-5) x DTH5N-3 (1-12) and DTHVI-5 (12-13) x DTH5N-3 (4-8) exhibited significant SCA effect for number of fruits per cluster, DTHVI-5 (12-15) x DTH5N-3 (4-8) for average fruit weight. Analysis of segregants in nine double cross hybrid populations with regard to important component characters in tomato revealed that there was higher frequency of transgressive segregants for number of fruits per plant followed by for fruit weight. DTH4U-1 x DTH5N-3 (15-11) had higher economic segregants for number of fruits per plant (40.4%), fruit weight (35.1) and yield per plant (35.2).HorticultureThesis