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ISSN 1025-6415. Допов. Нац. акад. наук Укр. 2019. No 11: 93—99 Heavy metals (HM), as constituents of various chemical compounds, are essential natural components of the Earth’s crust. As essential microelements, they affect the plant growth, deve lopment, and metabolism. However, at levels exceeding a certain threshold, HMs act as pollutants and pose an environmental threat. Excessive concentrations of HMs inhibit the plant growth, biomass accumulation, adversely affect the photosynthetic activity, mineral nutrition, and water exchange. Zinc is one of the essential microelements necessary for the normal life of plants. Its effect is manifested in the growth promotion, initiation of flowers, formation of grains, and activation of reparative processes [1]. At high concentrations, zinc is toxic to plants. In wheat, its excess inhibited the shoot growth and reduced the rate of photosynthesis [2]. In our studies, exogenous ABA was shown to mitigate the negative effects of high zinc concentrations on the grain germination and the growth of winter wheat seedlings [3]. Plant growth and development is regulated by a complex hormonal system, the interaction between components of which is synergistic or antagonistic. Hormonal substances occur in plant

Effect of zinc treatment on growth and phytohormones accumulation in Triticum aestivum L. seedlings priming with abscisic acid