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Concentration of Cd in leaves of T. gladiolaris plants grown on agar medium where either only the apical part was treated with Cd and the basal part was exposed to Cd-free medium (Cd-treated apex) or only the basal part was treated with Cd and the apical part was exposed to Cd-free medium (Cd-treated base). Values are means ± s.d. (n = 3). Different letters indicate a significant difference between treatments (P < 0·05).
