Heterosis Studies For Yield and Its Components in Tomato (Solanum lycopersicum l.) under Valley Conditions of Manipur

A 7x7 half diallel cross of tomato was evaluated with parents for heterotic manifestation of yield and yield attributing characters. The heterosis over superior parent (SP) to the extent of 22.05, 14.59, 139.61, 29.47, 98.70, 102.08, 163.20, 110.98, 177.85 and 165.03 per cent was recorded for days to flowering, days to last ripening, plant height, primary branches per plant, fruit weight, number of fruits per plant, yield per plant, fruit size, number of seeds per fruit and number of locules per fruit, respectively. The crosses showing heterosis for yield per plant were not heterotic for all the characters under study. The heterosis for yield was generally accompanied by heterosis for yield components. Five promising crosses viz., Ox-heart x Sutton Roma, Marglobe Supreme x Sutton Roma, Money Maker x Pusa Early Dwarf, Marglobe Supreme x Money Maker and Sutton Roma x Pusa Early Dwarf were identified for developing high yielding F1 hybrids/ varieties of tomato with many desirable traits.