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Iron plaque formation in the roots of Pistia stratiotes L.: importance in phytoremediation of cadmium

2019; Taylor & Francis; Volume: 21; Issue: 2 Linguagem: Inglês

10.1080/15226514.2018.1474442

1549-7879

Kambam Tamna Singha, Abin Sebastian, Majeti Narasimha Vara Prasad,

Geochemistry and Elemental Analysis

Aquatic macrophytes play an important role in the removal of toxic metals from wastewater. Therefore, the induction of Fe plaque on the roots, and its consequences on Cd tolerance investigated in an aquatic macrophyte Pistia stratiotes L. The presence of Fe2+ ion but not Fe3+ resulted in Fe plaque formation. Induction of Fe plaque decreased Ca and increased K and Fe accumulations in the root. Plaque formed plants had accumulated less Cd until 50.0 µM CdCl2 treatments because plaque acted as a barrier to Cd exposure. However, at higher concentrations (500.0 µM CdCl2), plaque formed plants contained more Cd in the roots. Cadmium inducible ion leakage in the root and lowering of the photosynthetic pigment content were less in plants with a plaque. Stretching of aromatic carbonyl groups and alkyl groups among plaque formed plants upon Cd treatments indicated the putative role of phenolics in Cd detoxification.