Arsenic uptake and transport of Pteris vittata L. as influenced by phosphateand inorganic arsenic species under sand culture
HUANG Ze-chun , AN Zhi-zhuang , CHEN Tong-bin , LEI Mei , XIAO Xi-yuan , LIAO Xiao-yong
DOI:
Received August 08, 2006,Revised October 26, 2006, Accepted , Available online
Volume 19,2007,Pages 714-718
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In order to understand the similarity or di erence of inorganic As species uptake and transport related to phosphorus in Ashyperaccumulator,
uptake and transport of arsenate (As(V)) and arsenite (As(III)) were studied using Pteris vittata L. under sand
culture. Higher concentrations of phosphate were found to inhibit accumulation of arsenate and arsenite in the fronds of P. vittata.
The reduction in As accumulation was greater in old fronds than in young fronds, and relatively weak in root and rhizome. Moderate
increases, from 0.05 to 0.3 mmol/L, in phosphate reduced uptake of As(III) more than As(V), while the reverse was observed at high
concentrations of phosphate (>1.0 mmol/L). Phosphate apparently reduced As transport and the proportion of As accumulated in fronds
of P. vittata when As was supplied as As(V). It may in part be due to competition between phosphorus and As(V) during transport. In
contrast, phosphate had a much smaller e ect on As transport when the As was supplied as As(III). Therefore, the results from present
experiments indicates that a higher concentration of phosphate suppressed As accumulation and transport in P. vittata, especially in
the fronds, when exposed to As(V); but the suppression of phosphate to As transport may be insignificant when P. vittata exposed to
As(III) under sand culture conditions. The finding will help to understand the interaction of P and As during their uptake process in P.
vittata.
