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Light response curves for the quantum yield of PS II and the relative electron transport rate (ETR) in intact dark adapted leaves from Hibiscus rosa-sinensis plants in control conditions (white circles) and after exposure to three photoperiods (18 h, 60 μmol·m−2·s−1 PPFD and 35 °C) with reduced irrigation (black circles). The stress photoperiods were separated by 6 h night-periods at 24 °C. The values are means ± SE from five independent replicates.
