Energy and nitrogen metabolism key enzymes activity and the pigment complex in Chlorella vulgaris under the effect of sodium selenite has been investigated. It is shown that in the investigated concentrations Se⁴⁺ causes an increase in the amount of chlorophyll a, b, carotenoids, and pheophytins (except the concentration of Se⁴⁺ 5 mg/dm³). Also activity of cytochromeoxidase and NADH-dependent glutamatedehydrogenase increases. Succinatedehydrogenase (except influence of Se⁴⁺ in a concentration of 5 mg/dm³) and NADPH-glutamatedehydrogenase is significantly reduced.

Keywords: Chlorella vulgaris, sodium selenite, pigment, cytochromeoxidase, succinatedehydrogenase, glutamatedehydrogenase

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