Figure 13.

Effect of Phosphatase Inhibitors on State Transitions.

S. elongatus (A) to (C) and Synechocystis (D) to (F) cells were incubated in the absence and presence of phosphatase inhibitors for 90 min in darkness. Then the cells (Chl concentration 2.5 μg/mL) were successively illuminated with blue light (85 µM photons m⁻² s⁻¹) and orange light (40 µM photons m⁻² s⁻¹) and the fluorescence changes were followed using a PAM fluorometer.

(A) and (D) Control cells containing NaCl (100 mM).

(B) and (E) Cells treated with Na₃VO₄ (1 mM).

(C) and (F) Cells treated with NaF (50 mM). Saturating pulses (400 ms × 1200 µM photons m⁻² s⁻¹) were applied every 60 s.