Figure 6. Effects of saline stress on the peroxidase (POD) activities in the roots and leaves from the silver maple seedlings exposed to different salinity levels (NaCl or CaCl₂) after 14 (A, D), 28 (B, E) and 360 (C, F) days.

Values are mean ± SD (n = 4). Different numbers above each bar indicate significant differences by ANOVA followed by Tukey’s test at P < 0.05.