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. 2014 Apr 28;14:111. doi: 10.1186/1471-2229-14-111

Figure 2.

Figure 2

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.