Figure 1.

Time kinetics of photosynthetic parameters and the glutathione pool following the shift to H-light. (a) CO₂ assimilation rate and (b) non-photochemical quenching (NPQ) were determined in L-light and N-light plants after transfer to H-light. Prior to the measurement, plants had been dark-acclimatized for 30 min. (c,d) Reduced glutathione (GSH) and oxidized glutathione (GSSG) were quantified in (c) (N → H)- and (d) (L → H) plants, respectively. Data are means ± s.d. of n = 3 independent experiments. In the case of glutathione, asterisks indicate significant differences to the controls, Student's t-test, p < 0.05.