Changes in Photosynthetic Characteristics Induced by Transferring Air-Grown Cells of Chlorococcum littorale to High-CO_2 Conditions : ENVIRONMENTAL AND STRESS RESPONSES : PROTEINS, ENZYMES AND METABOLISM

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When air-grown cells of Chlorococcum littorale was enriched with CO_2, growth was enhanced after a lag period of one to two days at 20% CO_2, and 3 to 6 days at 40% CO_2. Changes in the rate of photosynthesis measured as oxygen evolution and CO_2 fixation, were similar to those observed for growth. During the initial inhibition of photosynthesis in 40% CO_2, the activity of PSII was suppressed. In contrast, PSI activity was greatly enhanced. Air-grown cells of C. littorale possessed comparatively high carbonic anhydrase (CA) activity which was localized inside the cells and on the cell surface. Under high CO_2 concentrations extracellular CA activity was greatly suppressed and intracellular activity almost completely abolished. Phosphoenol pyruvate carboxylase activity was also suppressed in high CO_2-grown cells. Ribulose-1,5-bisphosphate carboxylase activity was higher in high-CO_2 grown cells than in air-grown cells. The above results indicated that the lag phase induced by 40% CO_2 was due to suppression of PSII activity.
日本植物生理学会の論文