Studies on Heterobeltiosis, Combining Ability and Gene Action in Tomato (So/an urn lycopersicum)

摘要

In this investigation, a 4 x 2 line x tester mating design was followed to record heterosis over better parent for 11 characters. Crosses showing high specific combining ability (SCA) and yield may be ascribed to their high general combining ability (GCA) for fruit number per plant or fruit weight or polar diameter of fruit. Two promising hybrids (CLN2777G x BCT-59 and CLN2777A x BCT-82P) were selected on the basis of their performance per se: heterosis was manifested in them and the SCA effects arerelevant since they can be used commercially because of high yield, better quality traits, and low percent disease index (PDI) values for tomato leaf curl disease (ToLCV) disease. Predominance of additive gene action was evident in the control of characters like days to 50% flowering, and PDI. Both additive and non-additive gene action were important for polar diameter, pericarp thickness, and fruit acidity whereas fruit weight, fruit number per plant, locules per fruit, total soluble solids (TSS), andfruit yield per plant were governed by non-additive gene action.