Figure 5.

Impact of high CO₂ on gas chromatography-mass spectrometry metabolite profiles in Arabidopsis Col-0 leaves. A, Metabolites that showed significant differences between air and high CO₂ (P < 0.05; n = 3 biological replicates) and that were repressed or induced at least 2-fold (the dotted yellow line indicates a 2-fold increase in high CO₂). GABA, γ-Aminobutyrate. B, Principal component analysis of air and high-CO₂ (hCO₂) samples. C, Comparison of high-CO₂ effects (red) with oxidative stress effects (cat2; blue). Plants were grown as in Figure 3.