Effect of Fe<sup>2+</sup>, Mn<sup>2+</sup>, Zn<sup>2+</sup> and Pb<sup>2+</sup> on H<sup>+</sup>/K<sup>+</sup> fluxes in excisedPistia stratiotes roots
G. Tsala NdzomoDenis Omokolo NdoumouM. Awah
Abstract
Pistia stratiotes is used for the epuration of domestic sewage in the Biyem Assi phytopurification station. During the process, Fe2+, Mn2+, Zn2+ and Pb2+ are absorbed in substantial amounts by the plant. These metals modify the H+/K+ exchange system at the root level. H+ efflux is inhibited by Fe2+ and by Zn2+ and enhanced by Mn2+ and Pb2+. K+ influx is inhibited by Fe2+, by Zn2+ and by Pb2+ and enhanced by Mn2+. It is shown that the purification capacity ofPistia stratiotes can vary with the composition of the heavy metals in the surrounding medium.
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