Heterosis and inbreeding depression estimates for yield and fibre components in upland cotton (Gossypium hirsutum L.)

Hussain, K.; Abbas, G. . Dept. of Plant Breeding and Genetics; Aslam, M.; Hussnain, H.; Akhtar, M.N.; Irshad, M.

Heterosis and inbreeding depression estimates for yield and fibre components in upland cotton (Gossypium hirsutum L.)

2009

Hussain, K. (Arid Zone Research Inst., Bhakkar (Pakistan)) | Abbas, G. (University of Agriculture, Faisalabad (Pakistan). Dept. of Plant Breeding and Genetics) | Aslam, M. (Arid Zone Research Inst., Bhakkar (Pakistan)) | Hussnain, H. (Cotton Research Station, Multan (Pakistan)) | Akhtar, M.N. (Central Cotton Research Inst., Multan (Pakistan)) | Irshad, M.

Fifty-nine varieties/genotypes of Gossypium hirsutum L. collected from various cotton research institutes in Pakistan were grown in the field. Five cotton cultivars were selected out of this germplasm contrasting for three-fibre quality traits viz., staple length, fibre strength and fibre fineness. Three crosses were made using these five genotypes each between two varieties contrasting for one fibre quality trait, cross CIM-707 x 4-F for staple length designated as cross-l, cross NIAB-III x RH-1 for fibre strength designated as cross-II and MS-40 x 4-F for fibre fineness designated as cross-III. Four genotypes P1, P2, F, and F2 of each cross were developed and evaluated in the field in triplicated RCB design. Measurements were made relating to seed cotton yield and fibre quality components. Results revealed significant differences observed for all the traits under study. The magnitude and direction of heterosis for different traits varied in three crosses.

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