Figure 4.

Recovery of the maximum photochemical efficiency of PSII (F_v/F_m) in air after photoinhibition in wild-type and photorespiratory pathway mutants. Leaf discs (50 mm²) floating on water were exposed to strong light (2,500 μmol photons m⁻² s⁻¹) for 2 h in high CO₂ (0.6% CO₂ in air). The leaf discs were then vacuum infiltrated with water or 200 μg mL⁻¹ chloramphenicol (Cm). Subsequently, leaf discs were exposed to low light (40 μmol photons m⁻² s⁻¹) or high light (200 μmol photons m⁻² s⁻¹) in air to follow recovery. Values are mean ± sd (bars) of results from three independent experiments.