摘要：Bryophytes have been more and more studied, due to presence of many biologically active compounds among their secondary metabolites, unique drought resistance as well as due to their wide use as bioindicators of environmental pollution. The aim of the present study was to determine seasonal changes in chemical composition and composition of secondary metabolites in four moss species (Sphagnum fallax, Sphagnum magellanicum, Polytrichum juniperinum, and Pleurozium schreberi). Concentration of main groups of chemical constituents as well as antioxidant activity were determined and related to climate parameters (temperature, precipitation etc.) during two vegetation seasons. Dependence of both primary and secondary metabolism on climatic conditions was confirmed. Seasonal changes of 57 secondary metabolites reflected species-specific features. The pattern of seasonal changes of major groups of moss secondary metabolites was determined, allowing selection of the best timing for bioprospecting studies as well as for use as possible indicators of environmental stress.
