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Varietal differences in the content of H2O2 (A) and the enzymatic activities of SOD (B), APX (C), GPOX (D), and GR (E) in Medicago ciliaris leaves after 3 weeks of drought treatment. Values represent mean ± SE (n = 5) and the different letters a to c indicate significant differences between the treatments. Low soil water potential (WPl), high soil water potential (WPh), Biochar (Bc).
