The present study was conducted to track the progress in fruit size increment in inter-specific tomato hybrids from F1 to F12 generation. Selection was imposed at every generation and the incremental rate in single fruit size from one generation to another was obtained using relative performance difference (RPD) between successive generations. Increase in fruit size was vivid at every generation and there were discernable evidence to show that the inheritance of fruit size was under polygenic control. The fruit size incremental rate was slow from F1 to F7. Thereafter, the increase became more rapid and attained a peak at the F9 generation. The fruit size increase from F10 to F12 generation was remarkably low with the relative performance difference not exceeding 22%. The correlation studies showed non -significant relationship between fruit size and fresh fruit yield at the early generations. The association between the two traits was positive and significant at the advanced generations. The implications of these on tomato improvement have been discussed.
Key words: Tomato, fruit size, interspecific cross, Solanum esculentum, Solanum pimpinellifolium
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