Abstract
The affinity for inorganic carbon in photosynthesis of microalgae as well as submersed angiosperm is reduced when CO2 concentration is elevated to 1–5% [1]. It is gradually assumed that this is due to decreases in carbonic anhydrase and in the capacity of accumulating inorganic carbon in high-CO2 cells. The electron microscopy revealed that the chloroplast envelope was electronically denser in low-CO2 cells than in high-CO2 cells, while the opposite effect of CO2 was observed for the plasma membrane of Dunaliella tertiolecta [2]. From these results, we assumed that CO2 concentration during growth gives some effects on membrane lipids in algae. In the present study, we investigated the fatty acid composition in low-CO2 and high-CO2 cells as well as the variations in fatty acid composition after the shift of CO2 concentration.
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