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COMBINING ABILITY AND GENETIC VARIABILITY STUDIES IN POTATO (Pages : 1 - 3)

Haydar, A., Alam, M. K., Khokan, E. H., Ara, T., and Khalequzzaman, K. M.

Seventeen potato genotypes comprising seven parents and their ten crosses were evaluated during to November 2005 to March 2006 to study their combining ability and genetic variability. Mean squares due to GCA and SCA were highly significant for all the characters except number of branches/plant and dry matter content for which SCA mean square was non-significant. The mean squares due to GCA were found to be lower than SCA indicated pre-dominance of non-additive gene action for all the characters studied. The parents TPS-7, TPS- 364, Hera and Chamak were found best general combiners for tuber yield and other important characters. The crosses TPS-7 × TPS-13, TPS-364 × TPS-13, TPS-13 × MF-11, Hera × TPS-19 and Chamak × TPS-13 were observed to be the most promising hybrid combinations for yield and other yielding components. High estimates of co-efficient of variability, heritability and genetic gain for plant height, number of branches, tubers number and yield indicated that these traits are largely controlled by additive gene action and that strength selection for them would be effective.Download


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