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Effect of exogenous melatonin (MT) on phenotypes of poplar leaf discs exposed to methyl viologen (MV) for 24 h. (A) Control; (B) Control + MT; (C) MV; (D) MV + MT. Poplar leaf discs were pretreated with 150 μM melatonin in the dark for 12 h, and then, leaf discs were exposed to 50 μM methyl viologen in the light for 24 h.
