статье представлены данные относительно реакции различных сортов томата, несущих гены β (carotene) и r (yellow flesh), на стрессовые температуры (400C и 420C). Параметрами оценки эффекта служили длина зародышевого корешка, стебелька и проростка. Выявлена существенная дифференциация реакции генотипов томата на указанные температуры. В результате факторного анализа установлено, что вклад температуры в вариабельность формирующихся органов растения томата существенно выше вклада генотипа. Генотипы Mia, Breeding Line, местная форма из Тимишоара обладают высокой устойчивостью по всем изученным признакам, в связи с чем они представляют интерес для селекционной работы в качестве потенциальных источников жаростойкости.

The article presents data on the response of different tomato varieties carrying the β (carotene) and r (yellow flesh) genes to stress temperatures (400C and 420C). The parameters for evaluating the effect were the length of the embryonic root, stem, and seedling. A significant differentiation of the response of tomato genotypes to the indicated temperatures was revealed. Strong inhibition under the influence of 400C was found in the varieties Charovnitsa (-34.8%), Flacara (-35.1), Viking (-36.8%), Golden Jubilee (-51.0%). At a high temperature of 420C, there was a pronounced suppression of root growth in the most of studied genotypes; it was in the range of -6.5...-65.5%. Stimulation was found in the Mia variety; it was of 11.0%. There was an insignificant inhibition in the variety Vrozhainyi (-0.8%), Luci (-6.5%), and the local form from Timisoara (-11.1%). Under the influence of stress temperatures, genotypes showed a rather differentiated response and high variability of the stem length: inhibition (-9.7...-57.8%) occurred in 27 cases, and stimulation of stem growth was in 3 cases (+14.6%, +41.9, and +2.7). As for the length of the seedling, it decreased in comparison with the control within the range of 5.3...42.4% at a temperature of 400C and 5.3...57.4% at 420 C. As a result of the factor analysis, it was found that the contribution of temperature to the variability of the forming organs of the tomato plant is significantly higher than the contribution of the genotype. The genotypes Mia, Breeding Line, the local form from Timisoara is highly resistant for all studied traits, therefore, they are of interest in breeding work as potential sources of heat resistance.