Growth characteristics of Nostoc flagelliforme at intermittent elevated CO2 concentrations

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Abstract
Summary: Algal cultivation is a potential candidate for CO2 mitigation. CO2 plays important roles in mass cultivation of algae, including supplying carbon source and adjusting medium pH. To assess the possibility of using edible cyanobacterium Nostoc flagelliforme as carbon storage device, the growth characteristics of N. flagelliforme batch cultured under elevated CO2 concentrations (0, 2.5, 5, 20, and 40%) were investigated in this study. Results showed that the net photosynthetic rate, efficiency and carbon sequestration rate at 20% CO2 were increased at a maximum of 121 μmol O2 (mg chla)−1 h−1 8.40% and 0.17 g CO2 L−1 day−1, and increased by 0.42, 1.03 and 1.13 folds compared with that of the control, respectively. Higher CO2 concentration resulted in the declines in photosynthetic rate, efficiency and carbon sequestration rate because of medium pH reduction. Accordingly, the dry cell weight, amount of exopolysaccharides and protein content of N. flagelliforme cells at 20% CO2 were obtained at a maximum of 1.45 g L−1, 54.98 mg L−1 and 57.75%, increased by 0.93, 0.29 and 0.8 folds compared with that of the control, respectively. These results provided important information for CO2 mitigation by N. flagelliforme and would shed more light on elucidating the mechanisms of CO2 tolerance in cyanobacterium.
Funding Information
  • Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT) (IRT1166)

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