Fig. 2. Changes in chlorophyll fluorescence under drought stress. (A) Fv/Fo represents the ratio of variable to potential activity of PSII (the number and size of active photosynthetic centers). (B) Fv/Fm represents the ratio of variable to maximal chlorophyll fluorescence (maximal PSⅡ photochemical efficiency). Error bars represent standard error. Different letters on lines indicate significant differences at P < 0.05 (a lower-case letter for P. alba × P. davidiana and a capital letter for P. davidiana based on ANOVA with Tukey’s HSD).
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