The effects of ultraviolet-B irrad~ation on the cyanobacteria Anabaena vanabilis, Osclllat o m tenujs.Nodulana baltica, h ' harveyana and Phormid~um unc~natum (Baikal a n d Tubingen s t r a ~n ) Indicated that pigmentation and energy transfel to the photosynthetic reaction centers were impaired Absorption and fluorescence spectra showed photobleaching of photosynthetic pigments especially in the accessory antenna plgments wlth prolonged irradiat~on Fluorescence emission and excltation spectra indicated an initial d~sturbance of energy transfer and subsequent photobleachlng of these pigments Exposure to solar and artificial UV-B irradiation lesulted In a very rapid lnhibltion of photosynthetic oxygen exchange as compared to photobleaching, including structural changes In the photosynthetic apparatus KEY WORDS.
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Donkor et al. (1996) studied this question.