Fig. 1. Effective photochemical quantum yield of PSII, φPSII, as a function of actinic illumination intensity. φPSII was measured in (A) Col-0, (B) pgm1, and (C) spsa1 under control (green) and cold/high light stress (blue) conditions with an increasing actinic light intensity (PAR; n = 4). Conditions significantly differed within all three genotypes (ANOVA, p < 0.001).
