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Effects of melatonin on the photosynthetic rate (A), maximum efficiency of PSII photochemistry (Fv/Fm) (B), and chlorophyll content (C) in 3rd fully expanded leaves from wheat seedlings grown under control and salt stress (100 mM NaCl) conditions for 16 days. The bars (means ± SE, n = 3) labeled with different letters are significantly different at P < 0.05 according to Duncan’s multiple range tests.
