Estimation of Heterosis and Heterobeltiosis in F1 Hybrids of Upland Cotton

The present study was performed to evaluate the expression per se performance and heterosis effect for quantitative traits of 12hybrid involving seven varieties as testers in line x tester analysis. Experiment was grown under field conditions during 2012-2013 at experimental farm of Nuclear Institute of Agriculture, Tando Jam. It is noticed that the crosses involving genotypes Chandi-95, Bt-703, Bt-802 and Sadori exhibited higher performance mean and positive heterosis over mid parent and better parent heterosis for yield contributing characters like for plant height, sympodial branches, boll weight, bolls per plant and seedcotton well . Therefore transgressive F1 hybrids and heterosis can be exploited to create genetic variability followed by the selection of high yielding genotypes of cotton and establish lines with superior features and improved through subsidiaries to bring income seedcotton, however, segregating generations the degree of heterosis is a key factor for use