Abstract
The cell morphology and carotenoid composition of the Cyanobacterium Clorogloea fritschii are known to depend on growth conditions. The presence of sucrose in the medium resulted in an increase in the amount of the carotenoid glycoside myxoxanthophyll and an increased proportion of aseriate cells. The same carotenoids were present in light and dark-grown cultures, but light was needed for these carotenoids to be fixed into photosynthetic membranes. Photosystem 1 and 2 preparations both contained carotenoids; PS1 was enriched in β-carotene, PS2 in myxoxanthophyll. Both photosystems were depleted in echinenone; the location of this in the cell has not been identified.
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