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Hydrogen peroxide and ABA levels in the leaves of 10-week seedlings of Populus tomentosa under 200 mM NaCl for 0, 6, 12, 24 h. (A) DAB staining showed H2O2 accumulation in situ; (B) H2O2 concentration; (C) ABA concentration. Vertical bars (when indicated) represent the mean ± SD a representative of three separate experiments. Data were analyzed by ANOVA in the SPASS software. a, b, c indicate statistically significant differences (P < 0.05) for the designated time point.
