Heterosis Studies for Yield and its Components in Tomato (Solanum lycopersicumL.) Under Valley Conditions of Manipur

Heterosis for yield components and yield per plant was studied using 7x7 half diallel cross between bacterial wilt-resistant/tolerant genotypes and high-yielding varieties. The heterosis over better parent (BP) was up to the extent of -38.14%, 42.04%, 36.14, -5.70%, -5.65%, 26.32%, 63.44%, 4.83%, 16.50%, 38.88%, 62.70% and 45.89% was recorded for plant height, number of primary branches per plant, number of secondary branches per plant, days to 50% flowering, days to maturity, fruit set, fruit length, fruit width, number of locules per fruit, number of fruits per plant, fruit weight and fruit yield per plant, respectively. The extent of heterosis was not so high as we are also looking for resistant to the bacterial wilt disease. The crosses showing heterosis for fruit 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., Arka Ahuti x LO-5973, Arka Vikas x TWC-4, Arka Ahuti x TWC-4, BRH-2 x LO-5973 and CAU-TS-9 x LO-5973 were identified for developing high-yielding F1 hybrids/varieties of tomato with many desirable traits.