Fig. 1
Analysis of QY in dark- and light-adapted Arabidopsis plants. A) QY measurements taken at different PAR intensities from Col-0 plants grown under well-watered conditions. Violin plots show the data distribution, median, 25th, and 75th percentiles (n = 15 plants, three independent experiments). Redline, linear regression; gray area, 95% confidence region; R, Pearson correlation coefficient. B) Comparison of QY in dark- (Fv/Fm) and light-adapted (Fv’/Fm’, 100 μmol m− 2 s− 1) plants in well-watered conditions (n = 15 plants, three independent experiments). Asterisks, significant difference (Wilcoxon signed-rank test, P < 0.001. C) QY in dark- (Fv/Fm) and light-adapted (Fv’/Fm’, 100 μmol m− 2 s− 1) plants that survived or died after a severe drought treatment (n = 15 biological replicates, two independent experiments). Asterisks, significant differences (Student’s t-test, P < 0.001). D) Single QY measurements of drought-treated plants before recovery irrigation in the dark (Fv/Fm) and light conditions (Fv’/Fm’, 100 μmol m− 2 s− 1). Redline, threshold estimated by a GLM; R, point biserial correlation coefficient (n = 30 plants, two independent experiments)