Figure 4.

PSII Photoinhibition in P. patens Plants Monitored by F_v/F_m Measurements.

The wild type (black squares), vde KO (open circles), and lhcsr psbs KO (black stars). Ten-day-old plants were exposed to excess light stress (24°C, 850 µmol photons m⁻² s⁻¹) for 5 h. Photoinhibition was measured following the decrease of F_v/F_m calculated from chlorophyll fluorescence. Data are mean values of three to four independent plates, and eight spots per plate were analyzed after fluorescence imaging. Error bars indicate sd.