Fig. 5

Enzymatic assays of key biochemical CCM-related genes in different concentration of CO2 cultivated P. tricornutum. A–F Exhibit the enzyme activity of NAD-ME1, NADP-ME, NAD-MDH, PEPCK, PEPC, and PPDK, respectively. Data are expressed as means ± SD of three replicates. ME: malic enzyme; MDH: malate dehydrogenase; PEPCK: phosphoenolpyruvate carboxylase kinase; PEPC: phosphoenolpyruvate carboxylase; PPDK: pyruvate orthophosphate dikinase; NC: normal CO2; LC: low CO2; HC: high CO2