Figure 2.

Effect of 3 h of photoinhibition (PI) at 2°C (t_o) followed by 4 h of recovery at different temperatures on F_v/F_m activity in the leaves of wild-type Arabidopsis (black bars) and fab1 (gray bars) plants. Photoinhibition was carried out under 1,200 μmol quanta m⁻² s⁻¹ of white light; recovery was under 70 μmol quanta m⁻² s⁻¹. Values are averages of 15 leaves from three different experiments. The average initial value of F_v/F_m in wild-type and mutant plants varied between 0.82 and 0.83.