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Effects of red light (RL) night break (NB) on phytohormone contents in leaves and stems of tomato plants. (A) Effects of RL NB treatment every 1, 2, 3, and 4 h on IAA contents in tomato leaves and stems. (B) Effects of RL NB treatment every 1, 2, 3, and 4 h on GA contents in tomato leaves and stems. Vertical bars represent SE (n = 3). Bars with different letters are significantly different at the level of P = 0.01 (Duncan's multiple range test).
