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Title: Evidence for exocellular Arsenic in Fronds of Pteris vittata

Journal Article · · Scientific Reports
ORCiD logo [1];  [2];  [3];  [4];  [5]; ORCiD logo [6];  [7];  [1]; ORCiD logo [8]
  1. Michigan Technological University, Houghton, MI (United States). Department of Biological Sciences
  2. Nazareth College of Rochester, NY (United States). Department of Biology
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Photon Sciences Division
  4. Parsons, Somerset, NJ (United States)
  5. Rutgers Univ., Newark, NJ (United States). Department of Earth & Environmental Sciences
  6. Western Kentucky University, Bowling Green, KY (United States). Department of Biology
  7. Montclair State University, Montclair, NJ (United States). Department of Earth and Environmental Studies
  8. Stevens Institute of Technology, Hoboken, NJ (United States). Department of Civil, Environmental and Ocean Engineering

The arsenic (As) hyperaccumulating fern species Pteris vittata (PV) is capable of accumulating large quantities of As in its aboveground tissues. Transformation to AsIII and vacuolar sequestration is believed to be the As detoxification mechanism in PV. Here we present evidence for a preponderance of exocellular As in fronds of Pteris vittata despite numerous reports of a tolerance mechanism involving intracellular compartmentalization. Results of an extraction experiment show that 43–71% of the As extruded out of the fronds of PV grown in 0.67, 3.3 and 6.7 mM AsV. SEM-EDX analysis showed that As was localized largely on the lower pinna surface, with smaller amounts on the upper surface, as crystalline deposits. X-ray fluorescence imaging of pinna cross-sections revealed preferential localization of As on the pinna surface in the proximity of veins, with the majority localized near the midrib. Majority of the As in the pinnae is contained in the apoplast rather than vacuoles. Our results provide evidence that exocellular sequestration is potentially a mechanism of As detoxification in PV, particularly at higher As concentrations, raising concern about its use for phytoremediation.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; AC02-98CH10886; AC02-06CH11357
OSTI ID:
1392210
Report Number(s):
BNL-114093-2017-JA
Journal Information:
Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (3)

Microbial and Plant-Assisted Bioremediation of Heavy Metal Polluted Environments: A Review journal December 2017
Effects of Pyrolysis Temperature and Chemical Modification on the Adsorption of Cd and As(V) by Biochar Derived from Pteris vittata journal April 2022
Phytoextraction of arsenic forms in selected tree species growing in As-polluted mining sludge journal April 2019

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