Genetic Study of Morphological and Yield-Related Traits in Gossypium hirsutum L.

摘要

Combining ability effects were determined in a population obtained from the full diallel crossing of6 different cotton genotypes for earliness, fiber quality and other yield-related parameters. The comparison ofperformance of six parents for their general combining ability showed that parent NIAB-777 was proved to bethe good general combiner for number of sympodial branches, days to 1st boll opening, boll maturation period,fiber strength and boll weight, whilst MNH-886 was found to be the best general combiner for number of bollsper plant, seed cotton yield and seed weight. Genotype PB-899 was good general combiner for a number ofmonopodial branches and fiber length. Genotype AA-802, IR-3701 and FH-114 were good general combiner forplant height, fibre fineness and days to 1st flowering, respectively. The following combinations, AA-802 × FH-114, MNH-886 × NIAB-777, AA-802 × PB-899 were considered best combinations for further research.Non-additive genetic effects were important for plant height, number of monopodial branches, numberof sympodial branches, days to 1st boll opening, boll weight, fibre length, fibre strength and fibre fineness,While, additive genetic effects were important for days to 1st flowering, boll maturation period, number of bollsper plant and seed cotton yield. Traits showing additive genetic effects may be improved through simpleselection method.