Figure 2.

Effects of rSP light illumination on the incident photo-oxidizable P700 (Pm’), photo-oxidizable P700 (Pm), maximum quantum efficiency of PSII (Fv/Fm), and amount of Fe/S in wild-type (WT) and pgr5^hope1 Arabidopsis. The leaves were illuminated every 10 s with short-pulse light (300 ms) of 15,000 μmol photons m⁻² s⁻¹ under the atmospheric conditions (40 Pa CO₂/ 21 kPa O₂) for 30 min. The rSP light illumination started at 0 min. (A) Pm’. Black, WT; magenta, pgr5^hope1. The mean values were normalized to the primary values before the rSP light treatment; error bars represent the standard deviation; data were acquired from six biological replicates. (B) Pm, (C) Fv/Fm, and (D) Fe/S were compared before and after the rSP light illumination treatment in WT and pgr5^hope1. These parameters were evaluated after the illuminated leaves were left for 1 h in the dark. Each value was normalized to the value before the rSP light illumination treatment. ** p < 0.01 (Welch’s t-test).