Arsenic distribution and speciation in the fronds of the hyperaccumulator Pteris vittata

A - Papers appearing in refereed journals

Lombi, E., Zhao, F-J., Fuhrmann, M., Ma, L. Q. and McGrath, S. P. 2002. Arsenic distribution and speciation in the fronds of the hyperaccumulator Pteris vittata. New Phytologist. 156 (2), pp. 195-203.

AuthorsLombi, E., Zhao, F-J., Fuhrmann, M., Ma, L. Q. and McGrath, S. P.
Abstract

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).

KeywordsPlant Sciences
Year of Publication2002
JournalNew Phytologist
Journal citation156 (2), pp. 195-203
Digital Object Identifier (DOI)doi:10.1046/j.1469-8137.2002.00512.x
Open accessPublished as non-open access
Funder project or code443
512
ISSN0028646X
PublisherWiley

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