Deepening the knowledge on the removal of Cr(VI) by L. minuta Kunth: removal efficiency and mechanisms, lipid signaling pathways, antioxidant response, and toxic effects
- Fernández, María Inés
- Paisio, Cintia Elizabeth
- González, Paola Solange
- Perotti, Romina
- Meringer, Verónica
- Villasuso, Ana Laura
- Agostini, Elizabeth
DOIAbstract
Lemna minuta Kunth was used to remove Cr(VI) from aqueous solutions, and some of the mechanisms involved in this process were analyzed. In addition, the cellular signaling mediated by phospholipase D activity as well as antioxidant responses was also evaluated during the process. Cr(VI) removal efficiencies were 40% for 0.5 mg/L, after 24 h, and up to 18% at metal concentrations as high as 5 mg/L. Removal mechanisms displayed by these macrophytes include bioadsorption to cell surfaces and, to a greater extent, Cr internalization and bioaccumulation within cells. Inside of them, Cr(VI) was reduced to Cr(III), a less toxic form of this metal. At the first hours of Cr(VI) exposure, plants were able to sense chromium, activating membrane signal...
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