Abstract
SUMMARY The freshwater microalga, Chlamydomonas reinhardtii Dangeard, was cultured under 350 and 700 ppmv CO2 to determine the impact of doubled atmospheric CO2 concentration on its growth and photosynthesis. No significant difference was observed in the specific growth rate, photosynthetic efficiency, maximal net photosynthetic rate and light-saturating point between the low and high CO2 cultures. Both the low- and highCO2-grown cells showed reduced light-dependent O2 evolution rate and photochemical efficiency (Fv/Fm) owing to photoinhibition when exposed to high photon flux density. However, high-CO2-grown cells were less photoinhibited, and showed better recovery in dim light or darkness during the initial period of the recovery process.
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