To Estimates Heterosis and Heterobeltosis of Yield and Quality Traits in Upland Cotton

The research studies were carried out to enhance the incorporation of genes for high yield improved fibre quality endowed with disease resistant/ tolerance. The study was conducted at the experimental farm of the Nuclear Institute of Agriculture, Tando Jam, during 2009-10. Three cotton lines were crossed with two testers in line x tester pattern to draw genetic information. Result indicated that the crosses involving genotypes Okra, and NIA-Bt exhibited superior and positive heterosis over mid parent and heterobeltiosis over better parent for yield contributing characters such as sympodial branches and bolls per plant and seed cotton yield as well. This aims to develop new ideotypes/genetic stock endowed with high yield, improved fibre quality and resistant/ tolerance to CLCuV disease. Release of a variety and development of genetic stock for cross breeding programme are the main objectives of these studies. Key words: Cotton, Heterosis, Heterobeltiosis, Line x tester analysi