Abstract
Brassinolide, as a plant hormone, promotes growth of a number of plant species. Similar effects are induced by its epimer 24-epibrassinolide. In this paper we discuss the effects of brassinosteroids on the growth and proton extrusion in the green alga Chlorella vulgaris (Chlorophyceae). At concentrations between 10−15 and 10−8 m, brassinolide and 24-epibrassinolide induce a significant stimulation of growth and H+ extrusion. The growth was associated with an increase in the capability of algal cells to acidify the medium, where brassinolide is biologically more active than 24-epibrassinolide.
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