The distribution of cytokinins and gibberellins in Equisetum arvense L. generative and vegetative sprouts at different stages of ontogenesis has been studied. It was shown that hormonal system of this ancient plant has many common features with the hormonal system of higher vascular plants. Among them, the accumulation character of active hormone forms during ontogenesis, presence of local sites of their biosynthesis, qualitative composition of cytokinins. Some specific characteristics were identified, including high concentrations of conjugated forms of zeatin at early stages of development, different type of cytokinins distribution along the vertical axis of the vegetative and generative shoots, considerable amounts of gibberellins in strobiles during spore formation. Support of the balance between cytokinins and gibberellins during ontogenesis in E. arvense organs is regarded to be one of the factors that regulate metabolism and physiological functions of plants.

Keywords: Equisetum arvense, cytokinins, gibberellins, ontogenesis

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