Abstract
Existing tomato (Solanum lycopersicum L.) cultivars may not retain the ability to yield at desired levels. Twenty-eight tomato hybrids were studied to determine effects of heterosis on vine length, internode length, stem diameter, pH of tomato juice, total soluble solids, and reducing sugar from eight parental diallel excluding reciprocal crosses (half diallel) to quantify heterotic effects. Differences among parents indicated genetic diversity, and varying degrees of heterotic effects occurred for traits among hybrids. Maximum heterosis in the desired direction was for vine length, internode length, stem diameter, pH of tomato juice, total soluble solids, and reducing sugar over the mid-parent as well as the better parent. Hybrids P30 × P45 and P45 × P54 were best for most traits and could be potential sources for improved tomatoes for morphological traits; hybrids P30 × P45, E-02 × P28, and P54 × P59 might be used to improve tomato flavor attributes.
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