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metadata.artigo.dc.title: Chromate and phosphate inhibited each other's uptake and translocation in arsenic hyperaccumulator Pteris vittata L.
metadata.artigo.dc.creator: Oliveira, Letúzia Maria de
Lessl, Jason Thomas
Gress, Julia Ky
Tisarum, Rujira
Guilherme, Luiz Roberto Guimarães
Ma, Lena Qiying
metadata.artigo.dc.subject: Chromium
Pteris vittata
Samambaia chinesa
Arsênio - Hiperacumulação
metadata.artigo.dc.publisher: Elsevier B.V. Feb-2015
metadata.artigo.dc.identifier.citation: OLIVEIRA, L. M. de et al. Chromate and phosphate inhibited each other's uptake and translocation in arsenic hyperaccumulator Pteris vittata L. Environmental Pollution, [S. I.], v. 197, p. 240-246, Feb. 2015.
metadata.artigo.dc.description.abstract: We investigated the effects of chromate (CrVI) and phosphate (P) on their uptake and translocation in As-hyperaccumulator Pteris vittata (PV). Plants were exposed to 1) 0.10 mM CrVI and 0, 0.25, 1.25, or 2.50 mM P or 2) 0.25 mM P and 0, 0.50, 2.5 or 5.0 mM CrVI for 24 h in hydroponics. PV accumulated 2919 mg/kg Cr in the roots at CrVI0.10, and 5100 and 3500 mg/kg P in the fronds and roots at P0.25. When co-present, CrVI and P inhibited each other's uptake in PV. Increasing P concentrations reduced Cr root concentrations by 62–82% whereas increasing CrVI concentrations reduced frond P concentrations by 52–59% but increased root P concentrations by 11–15%. Chromate reduced P transport, with more P being accumulated in PV roots. Though CrVI was supplied, 64−78% and 92−93% CrIII were in PV fronds and roots. Based on X-ray diffraction, Cr2O3 was detected in the roots confirming CrVI reduction to CrIII by PV. In short, CrVI and P inhibited each other in uptake and translocation by PV, and CrVI reduction to CrIII in PV roots served as its detoxification mechanism. The finding helps to understand the interactions of P and Cr during their uptake in PV.
metadata.artigo.dc.language: en
Appears in Collections:DCS - Artigos publicados em periódicos

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