The article presents results of the investigations of adaptive reactions of the bryophytes with different sensitivity to water deficit, Bryum argenteum and Amblystegium serpens, in the dump area of sulfur deposits. Under the unfavorable hydrothermical conditions, an increase of total antioxidant activity of low-molecular antioxidants in the moss shoots, as well as accumulation of osmotically active substances, soluble carbohydrates, and free proline, were found. It was established that more tolerant to water stress plants of Bryum argenteum have considerably higher plasticity of the osmotically regulated system components and antioxidant activity during the vegetative season. It was shown that epigenetic systems can be involved in adaptation to water stress.

Keywords: water deficit, soluble carbohydrates, proline, antioxidant activity, seasonal changes, DNA fluorescence, bryophytes

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