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Plant Physiology 85:585-587 (1987)
© 1987 American Society of Plant Biologists

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Metabolism and Enzymology

Sodium Requirement for Photosynthesis and Its Relationship with Dinitrogen Fixation and the External CO2 Concentration in Cyanobacteria

Eva Sanchez Maeso, Francisca Fernandez Piñas, Mercedes Garcia Gonzalez and Eduardo Fernandez Valiente

Departamento de Biología, Facultad de Ciencias, Universidad Autonoma de Madrid, 28049, Madrid, Spain

Cells of Anabaena PCC 7119 and of a mutant strain of Nostoc muscorum unable to fix dinitrogen, grown at pH 8 and under low CO2 tension (air), showed a reduced capacity for photosynthesis when cultured in the absence of sodium, this inhibition being followed by symptoms of photooxidation, such as chlorosis, oxygen consumption in the light, and decrease of superoxide dismutase activity. The impairment of photosynthesis preceded that of nitrogenase activity, indicating that the requirement for sodium in photosynthesis was independent of its effects on nitrogen metabolism. However, when cyanobacteria were grown at pH 6.3 or under high CO2 tensions, sodium was not required for photosynthesis and no symptoms of photooxidation were observed.




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M. I. Orus, M. L. Rodriguez-Buey, E. Marco, and E. Fernandez-Valiente
Changes in Carboxysome Structure and Grouping and in Photosynthetic Affinity for Inorganic Carbon in Anabaena Strain PCC 7119 (Cyanophyta) in Response to Modification of CO2 and Na+ Supply
Plant Cell Physiol., January 1, 2001; 42(1): 46 - 53.
[Abstract] [Full Text] [PDF]


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Copyright © 1987 by the American Society of Plant Biologists