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The maximum efficiency of photosystem II (PSII) photochemistry (Fv/Fm) (a), and the efficiency of the water-splitting complex on the donor side of PSII (Fv/Fo) (b), of control (con) and 2- and 5-days Cd-treated Salvia sclarea plants. Error bars are standard deviations (n = 6). Columns with different letters are statistically different (p < 0.05).
