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Enzyme activities and malondialdehyde content of STO-OE and WT poplar. (A) Activity of catalase (CAT) in STO-OE and WT lines. (B) Activity of peroxidase (POD) in STO-OE and WT lines. (C) Activity of superoxide dismutase (SOD) in STO-OE and WT lines. (D) Malondialdehyde (MDA) content of STO-OE and WT lines. Values are the mean ± SD (n > 3). Asterisks denote significant differences: ** p < 0.01; * p < 0.05.
