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. 2021 Apr 22;27(5):1059–1072. doi: 10.1007/s12298-021-00984-6

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© The Author(s) 2021

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Fig. 2 — Chlorophyll a fluorescence parameters of lettuce leaves, treated with water (CONTROL) and glutamic acid and grown under two water regimes (well-watered: NO STRESS and water stress and re-watering: STRESS). Measures were taken during the water stress (3/07) A and at the end of the cycle after the re-watering (12/07) B. Data plotted are fluorescence parameters normalized by formulae: (Ft—Fnsc)/Fnsc, where “Ft” and “Fnsc” represent the parameter values of the treated plants and no stress control plants, respectively. Values of “Fnsc” plants were normalized to 0 (NO STRESS CONTROL, blue circle = 0)