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Appl Environ Microbiol. 1976 March; 31(3): 376-379

Factors influencing dark nitrogen fixation in a blue-green alga.

P Fay

ABSTRACT

Nitrogen-fixing activity declines first rapidly and then more gradually when Anabaenopsis circularis is transferred from light into dark conditions. The rate and duration of dark acetylene reduction (nitrogen fixation) depend upon conditions prevailing during the preceding light period. Factors (such as light intensity, CO2 concentration, and supply of glucose), which in the light affect photosynthesis and the accumulation of reserve carbon, have a profound effect on dark nitrogen fixation. Glucose greatly promotes nitrogen fixation in the light and supports prolonged nitrogenase activity in the dark. The results suggest that heterotrophic nitrogen fixation by blue-green algae in the field may be important both under light and dark conditions.

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Appl Environ Microbiol. 1976 March; 31(3): 376-379

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• Cumino, A. C., Marcozzi, C., Barreiro, R., Salerno, G. L. (2007). Carbon Cycling in Anabaena sp. PCC 7120. Sucrose Synthesis in the Heterocysts and Possible Role in Nitrogen Fixation. Plant Physiol. 143: 1385-1397 [Abstract] [Full Text]