Fig. 2

Comparison between the growth of WT and the hct53 mutant under different conditions. a +N conditions aerated with 0.04% CO2. b +N conditions aerated with 5% CO2. c −N conditions aerated with 0.04% CO2. d −N conditions aerated with 5% CO2. Abbreviations: WT, wild type; +N, nitrogen-replete conditions; −N, nitrogen-depleted conditions. ****p < 0.0001. The microalgae were cultured in 100-mL column bubbling with 0.04% or 5% CO2, respectively