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Maximum quantum yield efficiency of PS II, chlorophyll content and Rubisco activity 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.
