Plants of Pistia stratiotes L. accumulated appreciable amounts of Cd from aqueous solution, maximum being in roots than leaves. Accumulation was concentration -duration dependent, however, plant reached metal steady state concentration on 7 d at 10.0 µM Cd. The accumulation of Cd was accompanied by a decline in cellular levels of glutathione which was more evident in roots at different treatment durations. Both the concentrations of Cd (2.5 and 10.0 µM.) enhanced cysteine content, accumulation of acidsoluble thiols and induced synthesis of phytochelatins
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