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Primary fluorescence, F0 (a); maximal fluorescence, Fm (b); maximum quantum efficiency of PSII photochemistry, Fv/Fm (c); and electron transfer rate, ETR (d) for plants grown at varying salt stress at 48 h in leaves of plants that were treated with 0.5 mM γ-aminobutyric acid (GABA) or left untreated. Values are mean ± SE. Values with the same letters on the bars are not significantly different at P = 0.05 (LSD test).
