Draga M. Ecological Aspects of Regulation of Agrocenoses' Adaptation Potential under Modifying Effects of Physiologically Active Substances

The thesis is devoted to the study of Ecological Aspects of Regulation of Adaptation Potential of winter wheat (Triticum aestivum L.) by indicators of physiological adaptation of plants under modifying effects of physiologically active substances (PAS) Agrostymulin and Emistym in conditions of higher temperatures and water shortages as the main factors of Climate Change. It was established that the application of PAS on crops of winter wheat contributed to morpho-physiological and biochemical adaptation changes in the plant organism, especially in vegetation periods with conditions of higher temperatures and water shortages: change of quantitative indicators of stems' anatomical structure; increasing in plant pigments' content (chlorophyll a and b, carotenoids); increasing the leaf surface area and enhancing of xeromorphic peculiarities of leaves; increasing of physiological activity of flag leaf; improvement of production parameters of wheat due to activation of biochemical reactions of nitrogen metabolism. Theoretically and experimentally proved possibility of stable increasing yield of wheat under drought conditions, in particular, set technological parameters for optimal application of Agrostymulin and Emistym in winter and spring growing technologies in the Forest-Steppe Zone of Ukraine. It was established that the application of Agrostymulin and Emistym contributed to increasing the yield of winter wheat variety Polis'ka 90 (by 38.7 %) and spring wheat variety Colectivna 3 (by 32.4 %) and improved grain quality by increasing the protein content and gluten in grain.