Journal of Applied and Natural Science 6 (2): 625-632 (2014)
Heterosis, dominance estimate and genetic control of yield and post harvest
quality traits of tomato.
Pemba Sherpa1, Tania Seth2, Varun Durwas Shende1, N. Pandiarana2, Subhra Mukherjee1
and Arup Chattopadhyay3*
1Department of Genetics and Plant Breeding, Faculty of Agriculture, Bidhan Chandra Krishi Viswavidyalaya,
Mohanpur-741252 (West Bengal), INDIA
2Department of Vegetable Crops, Faculty of Horticulture, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur-741252
(West Bengal), INDIA
3All India Coordinated Research Project on Vegetable Crops, Directorate of Research, Bidhan Chandra Krishi
Viswavidyalaya, Kalyani-741235, Nadia (West Bengal), INDIA
*Corresponding author. E-mail: firstname.lastname@example.org
Abstract : Paucity of research on the development of tomato hybrid having desirable post harvest/or processing
quality in the tropics compel to undertake this study. Therefore, the present investigation was undertaken to identify
potential donors and crosses, to study the extent of heterosis and dominance behaviour, and to ascertain the
genetic control of fifteen yield components and post harvest quality traits through line x tester mating design in
tomato. Non-additive gene action controlled all characters studied, suggesting heterosis breeding for their
improvement. Among parental lines, CLN2777-G’ and ‘FEB-2’ were the best general combiners for yield and
processing traits and could be utilized further in tomato breeding programme. Crosses (‘CLN2768-A x A.C.AFT’ and
‘CLN2777-G x FEB-2’) showing high specific combining ability and yield involved parents showing high general
combining ability for fruit yield per plant and other horticultural traits. All 9 F1 hybrids had significantly higher number
of fruits per cluster and number of fruits per cluster over both mid-and better-parental values, while for the other
traits, hybrids expressed average heterosis in both directions. The maximum extent of heterobeltiosis (53.56%) was
found in lycopene content of fruit followed by number of fruits per cluster (32.59%) and fruit yield per plant (31.77%).
The performances of the hybrids illustrated the presence of various degrees of dominance effects i.e., partial to over
dominance /or no dominance. We could able to improve processing quality in spite of yield in the cross (‘CLN2777-G
x FEB-2’) which can substantially make a dent for processing industry in the tropics.
Keywords : Combining ability, Dominance estimate, Gene action, Heterosis, Tomato.