Fig. 7 | Scientific Reports

Fig. 7

From: Effects of exogenous melatonin on the growth and photosynthetic characteristics of tomato seedlings under saline-alkali stress

Fig. 7

Effects of melatonin on chlorophyll fluorescence parameters of tomato leaves under saline-alkali stress. (A) Maximum photosynthetic efficiency of PSII (Fv/Fm). (B) Photochemical quenching coefficient (qP). (C) Non-photochemical quenching coefficient (qN). (D) Actual photosynthetic efficiency of PSII (Y(II)). (E) Excitation pressure of PSΠ (1-qP). (F) The electron transport rates (ETR). (G) Excess excitation energy ((1-qP)/NPQ). (H) Non-photochemical quenching (NPQ). The results in the figure are means ± SE of three independent replications. Different letters in the figure represent significant differences between treatments (p < 0.05).

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