Browsing by Author "JAYARATHNA, R.G.Y.H."

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    ANALYSIS OF COMBINING ABILITY AND HETEROSIS IN TOMATO (Solanum lycopersicum) USING FULL DIALLEL CROSS
    (Uva Wellassa University of Sri Lanka, 2014) JAYARATHNA, R.G.Y.H.
    Combining ability and heterosis were studied in a full diallel mating design among four tomato cultivars (PH 12561, PH 12585, PH 12696 and PH 12835). The four parents and twelve hybrids as well as reference hybrid (Bhathiya) were evaluated on traits; (vegetative traits, reproductive traits, yield traits and fruit quality traits). Genetic parameters estimated by the Griffing's analysis method. Analysis of variance revealed highly significant differences among all the F1 hybrid means and their respective four parental values for most of traits. The mean squares due to general combining ability (GCA) and specific combining ability (SCA) were also highly significant for most of traits. Cultivar PH 12835 was found to be the best general combiner for vegetative, reproductive and yield traits. Cultivar PH 12696 was found to be the best combiner for fruit quality traits. PH 12561 X PH 12835 F1 hybrid was performed most of positive specific combining ability with increase vigor of F1 over the mid parent, better parent and standard variety for the vegetative and yield traits. PH 12585 X PH 12835 F1 hybrid was performed positive specific combining ability with increase vigor of F1 over the mid parent, better parent and standard variety for the reproductive traits. PH 12561 X PH 12696 F1 hybrid was performed positive specific combining ability with increase vigor of F1 over the better parent, mid parent and standard variety for the fruit quality traits. Low to moderate narrow sense heritability was observed in vegetative, yield and fruit quality traits. Low narrow sense heritability was observed in reproductive traits. Keywords: F1 hybrids, General combining ability, Specific combining ability, Hybrid vigor, Heritability