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Plant Physiology 65:810-813 (1980)
© 1980 American Society of Plant Biologists

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Articles

Salt-Induced Metabolic Changes in Dunaliella salina1

Aaron Kaplan2, Ulrich Schreiber3 and Mordhay Avron4

Department of Plant Biology, Carnegie Institution of Washington, 290 Panama Street, Stanford, California 94305

An increase of medium NaCl concentration induces Dunaliella cells to evolve O2 photosynthetically even in the absence of CO2. This NaCl-induced O2 evolution may reflect the induced conversion of reserve carbohydrate to glycerol. The quantum yield for the NaCl-induced O2 evolution, in the absence of CO2, is 1.5-fold higher than that obtained for CO2 fixation. Since the synthesis of glycerol from reserve carbohydrate in the absence of CO2 requires only 0.5 ATP/NADPH, whereas photosynthesis requires at least 1.3 ATP/NADPH, it is concluded that the ATP/2e– ratio coupled to NADP reduction in Dunaliella is lower than required for CO2 fixation.

2 Present address: Department of Botany, Hebrew University of Jerusalem, Jerusalem, Israel.

3 Present address: Biophysical Laboratory of the State University, Leiden, The Netherlands.

4 On leave from the Department of Biochemistry, Weizmann Institute of Science, Rehovot, Israel.

1 Carnegie Institution of Washington, Department of Plant Biology Publication No. 683.






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Copyright © 1980 by the American Society of Plant Biologists