Combining ability analysis for harvest index, seed yield and important component characters in opium poppy (Papaver somniferum L.)

Genetics of harvest index, seed yield and other components was studied following 8 x 8 half diallel analysis in F₁ and F₂ generations of opium poppy. Combining ability analysis showed both additive and nonadditive type of gene action playing significant role in controlling the expression of all the characters studied. Number of capsules/plant, capsule weight, leaves/plant, and seed yield were predominantly under the control of nonadditive gene action in F₁ generation. Harvest index, husk yield and capsule diameter were predominantly under control of additive type of gene action in both the generations and capsule weight in F₂ generation. The best general combining parents were IC 128 for seed yield and UO 185 and NBRI 3 for harvest index. MOP 539 x NBPGR 1, MOP 507 x NBPGR 1, IC 128 x UO 185 and NOP 4 x UO 185 showed good specific cross combinations for high seed yield and high harvest index.