Figure 2

Photoinhibition of PSII defined as decrease in Fv/Fm during photoinhibitory illumination. (a) wild-type and PsbS-KO plants. (b) PsbS-RNAi and vector-only plants. Leaves were illuminated at 2,000 μmol photons m^-2-s^-1 for photoinhibition in absence (closed symbols) or presence (open symbols) of 2-mM lincomycin. (c) Recovery of damaged PSII for 2 h in absence of lincomycin under dim light (50 μmol photons m^-2 s^-1). Recovery rate was calculated as % increase in Fv/Fm after 2-h recovery period relative to decreased value before recovery began. Each point represents mean of at least 4 experiments (SE indicated by bar) and the asterisks denote the results that were significantly different from those in the wild type (*P < 0.05). The statistical significance was evaluated using the Student's t-test.