Abstract
AbstractManganese (Mn) uptake capacities of water hyacinth (Eichhornia crassipes (Mart.) Solms, water lettuce (Pistia stratiotes L.) and slligator alternenthera (Alternanthera philoxeroides) were investigated with four Mn levels: 0(control), 50, 200, 400 mg/L. With increased Mn exposure, the tested plants showed similar responses with a decrease in relative growth rate and an increase in plant Mn concentrations. Comparatively, water lettuce had the significantly higher total Mn concentrations, shoots enrichment factor and translocation factor at all Mn‐treated treatments and the much greater total Mn removal at concentrations of 200 and 400 mg/L Mn. In most cases, Mn pollution significantly decreased Mg concentrations for all three plants. Concomitantly, increment trends of Fe, Cu and Zn concentrations were observed for water lettuce with the increasing external Mn concentrations, which could partly contribute to its higher Mn concentrations. The results indicated that water lettuce have standout potentials as a phytoremediation plant for Mn contaminated waters.
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