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Net photosynthesis, intercellular CO2 concentration, stomatal conductance of wheat (Triticum aestivum L. var. WH 542) leaves at 30 days after sowing (DAS). Plants were treated with melatonin (100 µM) and/or HT (100 µM) in the presence (40 °C) or absence (25 °C) of heat stress. Data are presented as means ± SE (n = 4). Data followed by the same letter are not significantly different by LSD test at p < 0.05. HS, heat stress; HT; hypotaurine.
