Вплив викидів Придніпровської ТЕС м. Дніпропетровськ на анатомічні показники стебла дворічного пагона представників роду Tilia
Impact of emissions of Pridneprovsk TPP in Dnipropetrovsk on the anatomical indices of stem of two-year whip of the Tilia genus representatives

Summary/Abstract: The paper presents discussion of the results of studying the impact of environmental contamination because of emissions of Pridneprovsk TPP in Dnipropetrovsk city on the anatomical indices of stem of two-year whip of the Tilia genus representatives. Objects of studywere T. platyphyllos Scop., T. europaea L. and T. cordata Mill. Material was collected in September 2015 on two sampling areas: experimental plot – tree plantations adjacent to Pridneprovsk TPP which emissions mainly comprise the pollutants such as sulfur dioxide, nitrogenoxides, particulate matter, with the share in total volume of emissions of the Plant being 67.3%, 18.7%, 13.3%, respectively; control plot(conditionally clean) – territory of the Botanical garden of Oles Honchar Dnipropetrovsk National University. For research, two-year whips located in the apical portion of branches of the same order of branching were taken. Sections were made at the medium cross-line of the stem, and stained with the alcoholic solution of phloroglucinol. 30 sections for each species were measured on each sampling area.In the objects under study on technogenically contaminated area the changes in dimensions of histological elements of the stem were found and the nature of such changes had specific differences. T. platyphyllos and T. europaea under action of toxic emissions of TPP demonstrated the increase of total size of primary cortex of stem and width of its individual components (plug, collenchyma, cortex parenchyma),maintenance of stable dimensions of the bark and its histological elements (hard and soft bast), and in T. europaea the wood radius as well,which we considered as the indicators of relative stability of these species in technogenic environment. In T. cordata in the TPP emissionzone we revealed the increase in the width of plug, cortex parenchyma, and total radius of primary cortex, which could provide certain tolerance of plants of this species in the adverse conditions of growth. Together with it, for T. сordata on the contaminated area we established the decrease in size of collenchyma, hard bast, soft bast, uneven development of the layer of wood which in aggregate could reduce the mechanicalstrength of the stem, disrupt the flow of organic substances and mineral nutrients in the system of specialized conducting tissues, and consequently increase the vulnerability of these plant species on technogenic territories. Sensitive anatomical figures indices of the stem of two-year lime whips are suggested as informative test parameters for use in the environment status monitoring in the conditions of technogenesis.

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