You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Arsenic Distribution and Speciation in the Fronds of the Hyperaccumulator Pteris vittata
Enzo Lombi, Fang-Jie Zhao, Mark Fuhrmann, Lena Q. Ma and Steve P. McGrath
The New Phytologist
Vol. 156, No. 2 (Nov., 2002), pp. 195-203
Stable URL: http://www.jstor.org/stable/1514012
Page Count: 9
You can always find the topics here!Topics: Arsenic, Plants, Epidermal cells, Arsenates, Ferns, Epidermis, Vacuoles, Arsenites, Speciation, Hyperaccumulators
Were these topics helpful?See something inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
• Pteris vittata is the first plant reported to be a hyperaccumulator of arsenic (As), and little is known about the mechanisms of As hyperaccumulation in this plant. • Arsenic distribution at the whole plant (fronds) and cellular level was investigated using chemical analyses and energy dispersive X-ray microanalyses (EDXA). Speciation of As in the fronds was determined using X-ray absorption near edge spectroscopy (XANES) analyses. • The majority of As was found in the pinnae (96% of total As). The concentration of As in pinnae decreased from the base to the apex of the fronds. Arsenic concentrations in spores and midribs were much lower than in the pinnae. EDXA analyses revealed that As was compartmentalized mainly in the upper and lower epidermal cells, probably in the vacuoles. The distribution pattern of potassium was similar to As, whereas other elements (Ca, Cl, K, Mg, P and S) were distributed differently. • XANES analyses showed that approximately 75% of the As in fronds was present in the As(III) oxidation state and the remaining as As(V).
The New Phytologist © 2002 New Phytologist Trust