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Superoxide (A), hydrogen peroxide (B), MDA content (C) and membrane stability index (D) in the cotyledonary leaves of R. communis after 6 day of exposure to CuSO4 (80 and 160 µM) and cytokinin (KIN and BAP) treatments in Hoagland’s nutrient medium. Values are the mean ± SE of three independent experiments. Different alphabetical letters indicate significant differences between treatments according to one-way ANOVA (Duncan’s test p ≤ 0.05).
