Parental lines, F1 generation of
domesticated tomato (Solanum lycopersicum L.) and Lycopersicon pimpinellifolium L. were evaluated at
Department of Crop Science, University of Nigeria, Nsukka for improvement in
their quantitative traits. The experiment was laid out in a randomized complete block design with three replications. Data were collected on the
quantitative traits and fruit yield. Better Parent Heterosis (BPH), genetic
variances, gene effects and heritability of the traits were estimated for the
hybrids. BPH result showed that the Wild × Petomech cross had the highest
positive BPH of 358.36% in fruit yield. The highest negative BPH of -95.59% was
recorded for the hybrid, Wild × Grosso in average fruit weight while the
hybrid, Insulata × Grosso had the lowest negative BPH of -16.27% in average
fruit weight. Additive gene action and additive × additive gene action (aa) were significantly in control of
three crosses, W × P, W × In and W × G in fruit yield. Additive variance was
higher than dominance variance in fruit yield for all the hybrids with wild as
one of its parents. Again, hybrids with wild as one of its parent as, W × G, W ×
In, and W × P had the highest narrow sense heritability in fruit yield (59.15%,
51.69%, 59.88%, respectively). High level of epistasis controlled some of the
quantitative traits and hybridization evidenced by the result was effective in
developing new tomato cultivars with positive heterotic effects in fruit yield.
 Osborn, T.C., Chad, K., Elaine, G. and Carl, J.B. (2007) Insight and Innovations from Wide Crosses: Examples from Canola and Tomato. Crop Science Society of America, Madison.
 Allard, R.W. (1960) Principles of Plant Breeding. John Willey and Sons Inc., New York.
 Shankara, N., Joep, V.D.J., Marja, D.G., Martin, H. and Barbara, V.D. (2005) Cultivation of Tomato: Production Processing and Marketing. Agromisa Foundation, Wageningen, 63-64.
 Kumar, Y.K.H., Patil, S.S., Dharmatti, P.R., Byadagi, A.S., Kajjidoni, S.T. and Patil, R.H. (2009) Estimation of Heterosis for Topovirius Resistance in Tomato. Karnataka Journal of Agricultural Sciences, 22, 1073-1075.
 Moll, R.H., Lonnquist, J.H., Fortuno, J.V. and Johnson, E.C. (1965) The Relationship of Heterosis and Genetic Divergence in Maize. Genet, 52, 139-144.
 Melchinger, A.E. (1999) Genetic Diversity and Heterosis. In: Coors, J.G. and Stuab, J.E., Eds., The Genetics and Exploitation of Heterosis and Crop Plants, Crop Science Society of America, Madison, 99-118.
 Choudhary, B., Punia, R.S. and Sangha, H.S. (1965) Manifestation of Hybrid Vigour in F1 and Its Correlation in F2 Generations of Tomato (Lycopersicon esculentum Mill). Indian Journal of Horticulture, 22, 55-59.
 Falconer, D.S. and Mackay, T.F.C. (1996) Introduction to Quantitative Genetics. 4th Edition, Prentice Hall, Essex.
 William, W. (1959) The Heterosis and the Genetics of Complex Characters. Nature, 184, 527-530.http://dx.doi.org/10.1038/184527a0
 Hossain, M.A., Khan, M.R.I. and Shaikh, M.A.Q. (1982) Morphological and Genetics in the Hybrid Derivatives of Oxheart and Anobik Tomato Cross. Bangladesh Journal of Botany, 11, 37-54.
 Courtney, W.H. and Peirce, L.C. (1979) Parent Selection Information Based on Morphological Trait. HortScience, 14, 458.
 Sharma, D.K., Chaudhary, D.R. and Pandey, D.P. (2001) Studies on Hybrid Vigour in Tomato (Lycopersicon esculentum Mill.). Haryana Journal of Horticultural Sciences, 30, 236-238.
 Mather, K. and Jinks, J.I. (1977) Introduction to Biometrical Genetics. Chapman and Hall, London.http://dx.doi.org/10.1007/978-94-009-5787-9
 El-Agamy, A.L., Eweida, M.H.T. and Okaz, A.M. (1975) Studies of Gene Action for Agronomic Characters in Cotton. Al-Azhan Agricultural Research Bulletin, 9, 3-10.
 Griffings, B. (1956) Concept of General and Specific Combining Ability in Selation to Diallel Crossing Systems. Australian Journal of Biological Sciences, 9, 463-493.
 Uguru, M.I. (2005) Crop Genetics and Breeding. 2nd Edition, Ephrata Press, Nsukka.
 Kumar, A., Mishra, V.K., Vyas, R.P. and Singh, V. (2011) Heterosis and Combining Ability Analysis in Bread Wheat (Triticum aestivum). Journal of Plant Breeding and Crop Science, 3, 209-217.
 Hayman, B.I. (1958) The Separation of Epistatic from Additive and Dominance Variation in Generation Means. Heredity, 12, 371-390. http://dx.doi.org/10.1038/hdy.1958.36
 Singh, R.K. and Chaudhary, B.D. (1985) Biometrical Methods in Quantitative Genetic Analysis. Kalyani Publishers, New Delhi.
 Acquaah, G. (2007) Principles of Plant Genetics and Breeding. Blackwell Publishing, Oxford.
 Dharmatti, P.R., Kulkarni, G.P. and Patil, R.V. (2006) Heterosis for Yield and Bacterial Wilt Incidence in Tomato. Journal of Asian Horticulture, 2, 151-154.
 Ghosh, K.P., Islam, A.K.M.A., Main, M.A.K. and Hossain, M.M. (2010) Variability and Character Association in F2 Segregating Population at Different Commercial Hybrids of Tomato (Solanum lycopersicon L.). Journal of Applied Sciences and Environmental Management, 14, 91-95.
 Causse, M., Buret, M., Robini, K. and Verschave, P. (2003) Inheritance of Nutritional and Sensory Quality Traits in Fresh Market Tomato and Relation to Consumer Preferences. Journal of Food Science, 68, 2342-2350.http://dx.doi.org/10.1111/j.1365-2621.2003.tb05770.x
 Gamble, E.E. (1962) Gene Effects in Corn (Zea mays L.) Relative Importance of Gene Effects for Plant Height and Certain Components Attributes of Yield. Canadian Journal of Plant Science, 42, 349-358.http://dx.doi.org/10.4141/cjps62-049
 Zdravkovic, J., Pavlovic, N., Girek, Z., Milka, B.J., Savic, D., Zdravkovic, M. and Cvikic, D. (2011) Generation Mean Analysis of Yield Component and Yield in Tomato (Lycopersicon esculentum Mill.). Pakistan Journal of Botany, 43, 1575-1580.