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Effects of exogenous spermidine (0, 0.15, 0.30, 0.45, 0.60 mM) on the levels of H2O2 and MDA in the roots of cv. Z081 (A,B) and cv. Z057 (C,D) grown under 200 mM NaCl stress. (A,C) H2O2 content; (B,D) MDA content. Data represent the means ± SE of three replicates. Values in a single column sharing the same letters are not significantly different (p < 0.05) (Duncan’s multiple range test).
