In order to investigate the morphological response of freshwater green algae toelevated CO2 concentration, Chlamydomonas reinhardtii Dang and Scenedesmus obliquus Kütz were cultured with enriched CO2, and their microstructure and ultrastructure were examined by microscopy and electron microscopy. The effect of CO2 enrichment to 186 μmol/L was insignificant on the shape and size of C. reinhardtii, but significant in reducing the volume of S. obliquus. High CO2 increased the amount of chloroplast. The pyrenoids occurred in low CO2 grown cells but not in high CO2 grown ones and more starch granules were observed in the former.
CO2
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