Fig. 5. Effect of bicarbonate (1 mM) and MnCl₂ (50 µM) on light- saturated PSII activity in thylakoid membranes from wild-type cells in the absence (WT) or presence of EZ (WT + EZ), and cia3 mutant cells (cia-3) before photoinhibition. Values are means ± SE (n = 3).