Abstract
Inheritance, general combining ability and specific combining ability were studied using four parents: FH-901, NIAB-Karishma, CIM-496 and MS-84 for different plant traits in Upland cotton (Gossypium hirsutum L.). Mean values of all genotypes were significantly different from each other for all the traits studied. Epistasis was not found to be involved in any of the traits. The inheritance of all the traits was controlled by additive type of gene action with partial dominance except seed cotton yield that was controlled by over-dominance type of gene action. It was further noticed that the parent MS-84 was best general combiner for the traits like plant height, number of monopodial branches and number of bolls. The cross MS-84 × NIAB-Karishma showed greater specific combining ability for plant height, number of monopodial branches and number of sympodial branches. Key words: Inheritance, additive-dominance model, over-dominance, combining ability.
Highlights
Cotton (Gossypium hirsutum L.) is a major cash crop of Pakistan as well as in the world
Simple selection is suitable for improvement of the traits like plant height, number of monopodial branches, number of sympodial branches, number of bolls and boll weight because inheritance of all these traits were controlled by additive type of gene action with partial dominance
Different results were reported by Zia-ul-Islam et al (2001), Saravanan et al
Summary
Cotton (Gossypium hirsutum L.) is a major cash crop of Pakistan as well as in the world. It contributes 7.8% to value added in agriculture and about 1.6% in gross domestic product (GDP) of the country. The area in the year 2011 to 2012 under this crop was 2.83 million ha and the production was 13.6 million bales. Cotton provides raw material for the textile industry and is a major source of foreign exchange earnings of the country. Oil extracted from cotton seed is edible and its seed cake is a rich feed supplement for milch animals. Multi-use of this crop has made it important for agricultural industry (Anonymous, 2012)
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