Nanoscale distribution of potentially toxic elements in seaweeds revealed by synchrotron X-ray fluorescence.

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  • Additional Information
    • Source:
      Publisher: Elsevier Country of Publication: Netherlands NLM ID: 9422688 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-3336 (Electronic) Linking ISSN: 03043894 NLM ISO Abbreviation: J Hazard Mater Subsets: MEDLINE
    • Publication Information:
      Original Publication: Amsterdam : Elsevier,
    • Subject Terms:
      Synchrotrons* ; Fucus*/metabolism ; Fucus*/chemistry ; Spectrometry, X-Ray Emission* ; Seaweed*/metabolism ; Seaweed*/chemistry; Water Pollutants, Chemical/analysis ; Water Pollutants, Chemical/toxicity
    • Abstract:
      Assessing the impact of potentially toxic elements (PTEs) on coastal waters requires understanding their interaction with seaweeds, as they are foundational organisms in nearshore ecosystems. While seaweeds are known to accumulate PTEs, information on the mechanisms and locations of this accumulation is very limited. We employed synchrotron-based X-ray fluorescence (S-XRF) to map the distribution of various chemical elements at nanometric resolution in Fucus vesiculosus, a brown alga dominant in intertidal zones. Our results revealed that different PTEs have distinct subcellular accumulation patterns, which are largely consistent across different samples and cell layers. The distribution of Ba and U was predominantly located in the cell walls, while Co, Ni, Cu, and Zn were concentrated within physodes, specialized organelles containing phlorotannins. These findings suggest that F. vesiculosus regulates PTE uptake either by preventing their accumulation, or by sequestering them into specialized organelles. Physodes seem to play a key role in this regulation, concentrating divalent elements to minimize their toxicity and potentially storing them for intracellular functions. The use of S-XRF allowed us to map elemental distributions on seaweed cells with unprecedented detail, furthering our understanding of the subcellular structures responsible for PTE accumulation, and setting the foundation for studying their uptake mechanisms.
      Competing Interests: Declaration of Competing Interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests. Anton Vazquez-Arias reports financial support was provided by Spain Ministry of Science and Innovation. M. Teresa Boquete reports financial support was provided by Spain Ministry of Science and Innovation. Anton Vazquez-Arias reports equipment, drugs, or supplies was provided by ESRF. Jesus R. Aboal reports financial support was provided by Spain Ministry of Science and Innovation. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
      (Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)
    • Contributed Indexing:
      Keywords: Fucus vesiculosus; Heavy metals; Marine pollution; PTEs; XRF
    • Accession Number:
      0 (Water Pollutants, Chemical)
    • Publication Date:
      Date Created: 20241110 Date Completed: 20241130 Latest Revision: 20241130
    • Publication Date:
      20241202
    • Accession Number:
      10.1016/j.jhazmat.2024.136454
    • Accession Number:
      39522220