Figure 9.

Dark-adapted F_v/F_m ratios measured on leaf discs from WT (white bars) and poplar overexpressing FeSOD (black bars) incubated overnight in the presence of different concentrations of MV and then illuminated for 2 h in high light (1100 μmol m⁻² s⁻¹) and saturating CO₂ (5%). Leaf discs were then allowed to recover in darkness for 2 h prior to F_v/F_m measurement. The F_v/F_m values measured at the end of the overnight incubation in water or MV (•) were compared with F_v/F_m values measured after 2 h of dark adaptation following exposure to high light (bars). Values are means ± se of six independent experiments.