Abstract
Exposure of green algae Chlorella vulgaris to short-term UV-B radiation (280 nm – 315 nm) induced several
changes in the function of photosystem II (PS II) studied by means of chlorophyll fluorescence (FL) and oxygen
evolving. The intensity of photosynthetic oxygen evolving intensity of algae suspension decreased in a similar
way to the FL parameter values in proportion to the applied dose of UV-B radiation (0.0, 3.2, 6.4, 12.8 kJ·m-2).
The correlation between photosynthetic oxygen evolving intensity and FV/FO ratio was better than that between
photosynthetic oxygen evolving intensity and FV/FM. The vitality index (Rfd) in the UV-B irradiated algae strongly
decreased, compared to the control, which indicates inhibition of potential CO2 fixation and cooperation between
light and dark reactions of photosynthesis. It may indicate damage of Rubisco.
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