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Concentrations of (a) reduced glutathione (GSH) and (b) phytochelatins (PCs) in white mustard “Rota” grown under different sulphur and/or nickel concentrations in the nutrient solution. Mean values (n = 9) followed by the same letter are not significant at 0.05 probability level based on Tukey’s honestly significance tests. Asterisks indicate significant effects for main factors and interactions between them.
