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In order to promote the photosynthetic growth rate of Chlorella in the presence of flue gas CO 2 from coal-fired power plants, spermidine was first used to enhance cellular resistance to a high CO 2 concentration (15%) and high light intensity (30 000 lux). It was found that low concentrations (100-300 μM) of spermidine significantly enhanced the photosynthetic growth rate of Chlorella . The accelerated cell division decreased the cell diameter from 3.64 μm to 2.71 μm and the fractal dimension from 1.60 to 1.49, and the activity of total superoxide dismutase (T-SOD) increased from 0.48 U mL -1 to 5.33 U mL -1 . Expression levels of key enzymes of photosystems I and II, ATP synthase and transportase markedly increased, thereby enhancing the electron transport and energy supply that reduced oxidative damage. Finally, an enhanced cellular resistance to the high CO 2 concentration and high light intensity increased the biomass yield from 0.11 g L -1 to 1.71 g L -1 (300 μM).

Spermidine enhanced resistance of Chlorella to high levels of CO2 and light intensity for improving photosynthetic growth rate

Spermidine enhanced resistance of Chlorella to high levels of CO₂ and light intensity for improving photosynthetic growth rate