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The basis of an effective breeding process is the genetic analysis of the inheritance of traits, which makes it possible to select the source material and form the optimal scheme for developing hybrids. The main criterion for assessing the quantitative traits of parental lines is combining ability. In this regard, the aim of the research was to study the combining ability for productivity and its components of 5 maternal lines of tomato with functional male sterility and 6 lines of testers (pollinators) with the subsequent selection of the best parents and their further use in developing heterotic hybrids. Using the methods of traditional breeding, guided by the methodology for assessing two genetically different sets of parental lines proposed by V.K. Savchenko, the results were obtained to determine the combining ability of the lines according to the characteristics: “plant productivity”, “average fruit weight” and “number of fruits per plant”. The effects of the total and specific combining ability of the material under study have been determined. The most promising lines for further breeding work on the development of new highly productive domestic tomato hybrids have been identified. Maternal line Cu1-36 (8) and testers LG-1212/11 and LG-1174/09 showed the maximum positive effects of TCA in terms of productivity and the number of fruits per plant. The results obtained in 2020 showed that the most productive hybrids (Cu1-36 (8) xLG-1174/09, St543xLG-1174/09, Sf04 (19) xLG-1174/09 and St644xLG-1212/11) were obtained with the participation of paternal lines with a high TCA value. The average weight of the fruit is more influenced by the combining abilities of the maternal lines. The effects of SCA in these combinations are high and medium.

Analysis of tomato lines combining ability by productivity traits for selecting acceptable parents when developing tomato hybrids