Reduction in Carbon Dioxide Emission, and Enhancement of Cell Yield by Control of Light Intensity in Photomixotrophic Batch Culture of Marchantia polymorpha

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Photomixotrophic cultures of Marchantia polymorpha were examined under light irradiation using glucose as an organic carbon source. The activity of ribulose 1, 5-bisphosphate carboxylase/oxygenase in the cells was found to be maximum at an absorbed light energy of E_c=8.7×10^2W/kg and the respiration rate of the cellsremained at alow level in the range of E_c=1.7×10^2 to 1.5×10^3 W/kg. Batch culture of M.polymorpha was carried out in a bioreactor while keeping the E_c value at about 3.5×10^2 W/kg by regulating incident light intensity between 19 and 220 W/m^2. During the culture conducted under controlled light, CO_2 evolution from the reactor was effectively suppressed and the obtained cell yield was 0.88 kg dry cells/kg glucose, whereas the yield was 0.62 kg dry cells/kg glucose throughout the culture conducted at the constant incident light intensity of 50 W/m^2.
社団法人日本生物工学会の論文
2000-03-25