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Abstract

Babyn et al.of plants for urban landscaping in accordance with their environmental characteristics.Due to climate change and a significant increase in anthropogenic impact, it is necessary to expand the range of planting materials when creating urban plantings. As noted by N. Seyidoğlu Akdeniz (2020), the use of plants of the genus Cercis L. for urban landscaping with white, pink, and purple colours gives a sense of calm, continuity and vitality, which, in turn, IntroductionGreen spaces in the urban greening system play a crucial role in the landscape and architectural, sanitary and hygienic, utilitarian and decorative, and other aspects of urban autecological relations. In particular, all green spaces reduce the level of gas and dust pollution, improve the microclimate by reducing the ambient temperature and increasing humidity, but different species cope with these tasks in different ways, so the question arises of the correct selection Abstract. Consideration of the role of green spaces in urban landscaping is extremely important, as they not only decorate the urban landscape, but also effectively reduce air pollution, regulate the microclimate and play an important role in improving the ecology and quality of life of residents. The purpose of the study was to determine the influence of urban environmental factors on the development and secondary metabolism of plants of the genus Cercis L. Plants growing in Kyiv (Ukraine) under conditions with different air humidity, anthropogenic load, and excess or lack of insolation were selected for the study. Plant growth processes were studied by morphometric parameters of annual shoots of Cercis siliquastrum 'Alba' and Cercis canadensis L. growing under different conditions. Morphometric methods, fluorescence microscopy, high-performance thinlayer chromatography and regression analysis were used in the study. The research data show that insufficient sunlight has a negative impact on shoot growth. The specificity of the phenolic profiles that can be used to distinguish between the species Cercis canadensis L. and Cercis siliquastrum 'Alba' was established. The principal component analysis confirmed that phenolic profiles depend on habitat conditions and affect plant growth and development. The Gaussian model was used to analyse the growth dynamics of annual shoots during the growing season, which allowed us to describe the specifics of internode formation during the growing season quite accurately. This model allowed us to detect the phenomenon of the last internodes falling off at the end of the growing season, which caused the deviation of the morphometric parameters of metameres from the normal distribution along the time axis. Anatomical studies confirmed that the separation of one or more of the last internodes was due to active corking of the internal tissues of the stem, blocking of the xylem and formation of a separating layer, which led to the fall of the shoot tip. This phenomenon shows signs of plant adaptation to low temperatures in winter. The tops of the sh...