Figure 2
From: Effects of high temperature on photosynthesis and related gene expression in poplar
Changes in chlorophyll fluorescence at high temperatures. A: Fo represents minimum fluorescence. B: ETR represents electron transport rate. C: Fv/Fm represents the ratio of variable to maximal chlorophyll fluorescence. D: F′v/F′m represents fluorescence in the light ratio. E: qP represents photochemical quenching. 0 h indicates the control group without high temperature treatment. 3-24 h indicates different times of exposure to heat stress. Error bars represent standard error. Different letters on error bars indicate significant differences at P < 0.01.