We studied five parental forms of tomato (Solanum Lycopersicum L.). Were obtained twenty F 1 hybrids by the complete diallel scheme (5×5) and used to study inheritance of the average weight of the fruit. Were used as parental forms in the system of diallel crosses according to Hayman V. I. and Jinks I. J.: the line №477 (sp, u), variety Alya (sp) and three collection samples with high lycopene content in fruits: Dark green (hp -2 dg ), MO 112 (hp) and T-3627 (B c ). The results of the evaluation are given of the general and specific combining ability of the five parental forms of tomato of the average weight of the fruit, established the character of inheritance. In the course of research it was found that the average weight of the fruit is controlled by the additive-dominant genetic system. Inheritance occurs by type of incomplete dominance. The main role in the genetic control of the trait is played by the additive effects of genes, which allows for selection, starting with the second hybrid generation. The direction of dominance varies from the dominance of genes that reduce the manifestation of the trait to its absence. The highest reliable effects of general combining ability (GCA) had the variety Alya, which must be used to create heterosis hybrids. From hybrid combinations with his participation in the future it is possible to make selections for creation of varieties.
<p> Five parental forms of tomato (Solanum lycopersicum L.) and twenty hybrids F1, were studied which were obtained by the complete diallel scheme (5 x 5). For genetic analysis (by Hayman, 1954; Jinks,1954) was used line №477 (sp,u), variety Alya (sp) with reduced duration of vegetation period and three collection samples with the high lycopene content in fruits: Dark Green (hp-2dg), МО 112 (hp), Т˗3627 (Bc). The effects of the general (GCA) and specific combining ability (SCA) of the duration of vegetation period were determined and established character of inheritance. According to the results of research, the duration of vegetation period is controlled by additive-dominant genetic system. Inheritance occurs by type of over dominance, and in dry and hot summers which led to the prolongation of the duration of vegetation period, there is a tendency to incomplete dominance, but it is apocryphal. In genetic control a major role play non-additive effects of genes. The best reliable effects of the general combining ability (GCA) had line №477 and variety Alya. They can be recommended for the creation of heterotic hybrids and varieties.</p>
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