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Effect of melatonin application on different stress-related parameters. (A) malondialdehyde (MDA) content; (B) hydrogen peroxide (H2O2) content; (C) chlorophyll content and (D) in situ O2●− accumulation by NBT staining. Mel, melatonin. Each data point presents the mean of six replicates (± S.D. (standard deviation)). Means denoted by different letters are significantly different (p < 0.05) based on the Tukey’s test.
