Salt-Induced Metabolic Changes in Dunaliella salina1

AUTOR(ES)

Kaplan, Aaron

RESUMO

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.

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