Author(s):

Vartika Budhlakoti and DC Baskheti

Abstract: Present investigation was undertaken to study heterosis through diallel design of experimental hybrids for yield and its component in basmati rice at Norman E. Borlaug Crop Research Centre. Pantnagar, Uttarakhand, India. Nine lines were crossed in the half diallel fashion and the resulting 36 hybrids along with their parents were evaluated for heterosis (heterobeltiosis and standard heterosis) in a replicated trial using randomized block design for grain yield per plant and various yield contributing characters namely days to 50% flowering, days to maturity, leaf area, plant height, number of panicles per plant, panicle length, number of grains per panicle, 1000 grain weight, biological yield and harvest index. Standard heterosis was estimated by using Improved Pusa Basmati 1 as a check parent. For grain yield per plant, 15 crosses over better partent (5.74 to 56.23%) and 13 over standard variety (7.20 to 40.18%) manifested significant desirable heterosis. Of these twelve crosses viz., PS 4×PS 5, PS 4×PS 6, PS 4×PSD 17, PS 4×PB 1, PS 4×Pu Bas 1, PS 5×PS 6, PS 5×PB 1, PS 5×PB 2, PS 5×Pu Bas 1, PS 6×PB 2, PB 1×PB 2 and PB 2×Pu Bas 1 displayed heterosis over both better parent as well as standard variety for grain yield per plant and also showed desirable BPH and SVH for various yield component traits.

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