The non-heterocystous filamentous cyanobacterium showed a several-fold decline in photosystem II dependent O evolution during the diazotrophic phase of growth. A sharp fall in the amounts of light-harvesting pigments and an uncoupling between the electron transfer from the photosystem II complex to the quinone acceptors may lead to the depression of light-dependent O evolution during the diazotrophic phase. Nitrogen fixation as well as CO fixation required light, but were partly supported independently of photosystem II. A stimulation of photosystem I and a depression of photosystem II occurred during the diazotrophic phase of a nitrogen-fixing culture of .


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