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When cells of the unicellular cyanobacterium Gloeocapsa alpicola CALU 743 are deprived ofnitrate, the phycobilisomes are actively degraded by a proteolytic process termed chlorosis, which accompaniedby decrease of rates of oxygen evolution and carbon dioxide fixation, increase of amount of stored glycogenand increase of hydrogenase activity. Suspensions of such cells exhibited a capacity for light-dependentinorganic carbon photoassimilation under anaerobic conditions in the presence of hydrogen and DCMU. Therate of 14C incorporation was commensurable with that for nitrate-sufficient cells at oxygenic photosynthesisand reached 35–38 μmol 14Ch-1mg-1 Chl a. Incubation of G. alpicola grown aerobically in the presence oflimiting concentrations of nitrate under anaerobic conditions (Ar, CO2, DCMU) in the light with addition ofnitrate and H2, resulted in the increase of cellular protein, evidencing that G. alpicola cells with high level ofhydrogenase activity are able to perform H2-dependent anoxygenic photosynthesis at levels supporting thegrowth of this cyanobacterium

Facultative H2-dependent anoxygenic photosynthesis in the unicellular cyanobacterium Gloeocapsa alpicola CALU 743