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Melatonin application effect on tomato plants’ photosynthetic parameters: (A) photosynthetic rate, (B) stomatal conductance, (C) transpiration rate, and (D) CO2 assimilation rate after 10 days of drought stress. The values are the average of six replicates ± S.D. (n = 6). Significant differences among different treatments in the experiment were determined by LSD 0.05 test and are indicated by different letters.
