Figure 5.

Response of the WT and nadk2-2 to high-light (HL) treatment. A, Change of F_v/F_m values of the detached leaves from the WT and nadk2-2 exposed to HL illumination (600-µmol photons m⁻² s⁻¹) for 5 h, followed by 6 h of recovery at low light (20-µmol photons m⁻² s⁻¹). Prior to HL treatment, the soil-grown Arabidopsis seedlings were grown at 60 µmol photons m⁻² s⁻¹ for 3 weeks. Results are presented as means ± sds (n = 6). B, The F_v/F_m values mearsured at normal light (NL, 60 µmol photons  m⁻² s⁻¹) were regarded as 1. The relative F_v/F_m values of Arabidopsis plants after 5 h of HL treatment and 6 h of recovery (REC) are shown. Results are presented as means ± sds (n = 6). C, Change of thylakoid protein levels of nadk2-2 and WT plants after HL treatment and recovery. Their relative levels are shown below the blots.