Fig. 5. Impact of different light intensities and CO₂ levels on expression of photoprotective genes.

CC-125, cia5 mutant cells, and the rescued cia5-C strains were grown and dark adapted as described in the legend of Fig. 1 and then transferred to HSM or HSM + 5% CO₂ for 1 hour at LL (30 μmol of photons m⁻² s⁻¹), ML (120 μmol of photons m⁻² s⁻¹), or VHL (1000 μmol of photons m⁻² s⁻¹). Transcript levels were normalized to the level in WT cells before induction (D, dark) (dashed line). n = 3 + SD. Statistical analyses and P values are listed in data S1.