The seasonal dynamics of endogenous cytokinins and gibberellins in thallus of brown macroalgae Cystoseira barbata (Good. et Wood.) J. Ag. were studied for the first time. The changes in hormones contents during vegetation indirectly indicate possible role of gibberellins as a seaweed growth processes regulator and do not allow to consider the same role for cytokinins. Both hormones apparently participate in regulation of reproduction processes in C. barbata. The winter storm-cast seaweeds may be recommended for utilization as the sources of effective biologically active growth regulators due to high cytokinin and gibberellin concentrations in plants tissues in winter period.

Keywords: Cystoseira barbata, cytokinins, gibberellins, ontogenesis

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