Manipulation of combining ability and its significance in cotton (Gossypium hirsutum L.)
1993
Ikram, M. | Masood, A. | Naveed, A. (Vegetable Research Inst., AARI, Faisalabad (Pakistan))
Combining ability analysis was performed in a four parent diallel cross of upland cotton (G. hirsutum L.) for yield per plant, boll number, boll weight, GOT percentage, staple length, seed index, lint index, number of monopodial branches and number of sympodial branches. General combining ability (GCA) mean squares were significant for all traits except yield per plant. Specific combining ability mean squares were significant for all traits except number of sympodial branches per plant. The larger proportion of variance due to SCA indicated more non additive type of genetic behaviour for yield, GOT percentage, seed index, lint index, plant height and number of monopodial branches. Other traits were predominantly controlled by additive gene action. PBG1 was the best general combiner for yield and number of bolls per plant; S12 for GOT percentage and number of monopodial branches per plant; CPL15/12 for staple length, plant height and number of sympodial branches per plant; and Allepo45 for boll weight, seed index and lint index. Two crosses i.e. 'PBG1 x S12' and PBG1 x CPL15/12' were found to be the best for further breeding on the basis of parental GCA effects, F1 mean performance and SCA effects. Reciprocal effects were non-significant for most of the characters except lint index (0.20).
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