Abstract
The cyanobacterium Anabaena flos-aquae (strain 1444) grown at different intensities of white light (900, 3500 and 30000 lux) showed changes in the content and composition of the pigments. Phycocyanin was more affected by high light conditions during growth than chlorophyll a. In comparison to in low white light grown cyanobacteria number of phycobilisomes and thylakoids decreased under strong light. A diminution of 14CO2 fixation, total amino acid content, glutamic acid and glutamine pools was found in strong white light grown cells. Under these conditions the majority of 14C-labelling was measured in sugar phosphates. After pressure treatment a marked increase of 14C-incorporation into amino acids could be obtained. Results were discussed with reference to regulation of buoyancy in Anabaena flos-aquae.
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