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Effects of three different photoperiods (12 h, 16 h, and 20 h) on the net photosynthetic rate (Pn) (A), intercellular CO2 concentration (Ci) (B), stomatal conductance (Gs) (C), transpiration rate (Tr) (D), and water use efficiency (WUE) (E) of tomato leaves. The data represent the mean of at least three biological replicates. Different letters indicate significant differences (LSD) (α = 0.05).
