Fig. 6. Impact of UV-B radiation, CO₂, and CIA5 on expression of CCM genes and photoprotective genes.

Changes in levels of transcripts from (A) the CCM genes LCIA and CAH1 and the photoprotective genes LHCSR1, LHCSR3.1, and PSBS after 1 hour of UV-B radiation (200 μW cm⁻²) in the absence (UV, dark purple bars) or presence (UV + CO₂, faded purple bars) of 5% CO₂ in the WT, uvr8, and cia5 strains; and (B) from LCIA, CAH1, and LHCSR3.1 in the dark after 24 hours in TAP (gray) and after two additional hours following the change of the culture from TAP to HSM (black) in the WT and cia5 mutant. n = 3 + SD. Transcript levels were normalized to the initial level of WT in the dark. Statistical analyses and P values are listed in data S1.