Production Of New Tomato Hybrids Under Egyptian Conditions [electronic resource].

Includes references.

This study was conducted to estimate the degree of heterosis and inbreeding depression for different traits, in the F1 and F2 generations. Six crosses of tomato cultivars (Lycopersicon esculentum Mill.) were evaluated. In summer growing season of 2000 all genotypes were planted at two locations. The combined data over both locations indicated the presence of significant heterosis versus the mid-parents and the better-parent for most studied traits. The cross Un 73 X Strain-B showed the highest heterotic effect for total yield as number and weight of fruits/plant. The heterosis values over mid-parent were 59.29 and 80.78% for total fruit number/plant and total fruit weight/plant, respectively. While, the values of heterosis over the better-parent were: 51.45 and 76.15% for total fruit number/plant and total fruit weight/plant, respectively. The results also revealed that the heterotic effects for total yield (number and weight of fruits/plants) were due to genes have an over-dominance type of inheritance. The obtained values of inbreeding depressions ranged from 38.76% for early fruit number/plant to 36.27% for early fruit weight/plant. Estimates of heritability in broad sense ranged from 11 % for plant height to 79% for total fruit weight.

Summary in Arabic.

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