Inheritance of percentage set, firmness and β-carotene and lycopene contents of tomato fruits [electronic resource].

Includes references.

This investigation was conducted in the research facilities of the Borticulture Research Institute during the period from 1997 to 2000 to study the inheritance of some characters of importance to winter tomato production under low tunnels. B8lled on former evaluation studies on these characters in 15 true-breeding tomato CVS, five crosses were made for genetic studies, viz., Supermarmande x Apex 1000 and Supennarmande x 506 Bush for studies on fruit set (FS) percentage, Apex 1000 x Siletz and Mountain ~Id VFF x Siletz to study the inheritance of fruit fmoness (FI), and Scotia (red fruits) x Mountain Gold VFF (tangerine fruits) to study the inheritance of fruit β-carotene and lycopene contents. Parental, F1, F2r, F3, and backcross populations of each cross were planted in a ReBD with 4 replicates in the 1999/2000 winter seson for evaluation under low tunnels using drip irrigation system. Pereentage FS W811 found to the controlled by one and 4 pairs of genes in the crosses Supennannande x Apex 1000 and Supennannande x 506 Bush, respectively, with over dominance of high FS pereentage in the first cross and partial dominance of the low FS percentage in the second one. Mid and better parent heterosis values were 39.1% and 13.4%, respectively, in the first cross, while it had negative values in the second one. BSB estimates were 73.6% and 23.7% in the two crosses, respectively. Fruit firmness W811 found to he controlled by 8 and 3 pairs of genes in the crosses Mountain Gold VFF x Siletz and Apex 1000 x Siletz, respectively, with partial dominance of the low FF character. Mid aud better parent heterosis values were negative in the two crosses. BSB estimates were 74.9% and 85.6% in the two crosses, respectively. Fruit β-carotene and Iycopene contents were found to be controlled by 2 pairs of genes for each pigment in the cross Scotia x Mountain Gold VFF with partial dominance of low over high content of each. They had negative values for both mid aud better parent heterosis. Inberitance of froit Iycopene content W811 affected maternally. BSB estimates were 78.5% and 82.7% for fruit β-carotene and Iycopene contents, respeetively.

Summary in Arabic.

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