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Photosystem (PS) I (A) and II (B) activities in the cotyledonary leaves of R. communis on 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).
