Abstract
The article deals with results of studying seasonal dynamics of accumulating phenolic glycosides in the leaves of Orthilia secunda during two years (2011 and 2020), growing in one phytocenosis, weather conditions being different. Threshold of Orthilia secunda development and the sum of effective temperatures above 10 <sup>о</sup>С needed for the main generative phenophases to begin were determined. Variability of phenolic glycosides qualitative content during a vegetative period and dynamics of their accumulation was investigated. Total content of phenolic glycosides in the leaves of the plant varies from 7,5% tо 12,5% and depends both on phenophase and on the sum of effective temperatures. Relatively stable regularity (r = 0,47, p < 0,05) characterized by 2 maximum accumulations of total phenolic glycosides corresponding to “flowering” and “vegetation termination” phenophases was established. These periods are recommended as optimal harvesting of Orthilia secunda crude material for medical purposes.
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