Transient Changes in the Energy State of Adenylates and the Redox States of Pyridine Nucleotides in Chlorella Cells Induced by Environmental Changes

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The unicellular green algae Chlorella ellipsoidea was used to study transient changes in the energy state of adenylates and the redox states of pyridine nucleotides induced by environmental changes. The transition from anaerobic to aerobic conditions in the dark induced a sharp rise in the ATP ratio [ATP/(ATP+ADP+AMP)], a sudden decrease in the NADH ratio [NADH/(NAD^++NADH) J and a transient drop in the NADPH ratio [NADPH/(NADP^++NADPH)]. Illumination after a dark period under anaerobic, CO_2-free conditions induced sharp increases in the ATP and NADPH ratios and a slower decrease in the NADH ratio. Illumination under aerobic conditions, in either the presence or absence of CO_2, caused a sharp increase in the NADPH ratio, a small increase in the ATP ratio and a slower increase in the NADH ratio. In the presence of CO_2, a subsequent large drop in the NADPH ratio occurred. Darkening under anaerobic, CO_2-free conditions induced a sudden decrease in the ATP ratio, a temporary fall in the NADPH ratio and a slow increase in the NADH ratio. Darkening under aerobic conditions induced transient drops in the ATP and NADPH ratios and a sudden drop in the NADH ratio. The addition of CO_2 to the atmosphere with illumination produced a decrease in all three parameters. These results are discussed in relation to current theories of the interaction between photosynthesis and respiration. Our observations indicate that the energy and reducing potentials generated by photochemical processes are used for and control other processes besides CO_2 fixation in photosynthetic cells.
日本植物生理学会の論文

Transient Changes in the Energy State of Adenylates and the Redox States of Pyridine Nucleotides in Chlorella Cells Induced by Environmental Changes

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