Arsenic uptake and transport of Pteris vittata L. as influenced by phosphate and inorganic arsenic species under sand culture.
In order to understand the similarity or difference of inorganic As species uptake and transport related to phosphorus in As-hyperaccumulator, 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 (> or = 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 effect 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.
Huang
Ze-chun
ZC
Centre for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
An
Zhi-zhuang
ZZ
Chen
Tong-bin
TB
Lei
Mei
M
Xiao
Xi-yuan
XY
Liao
Xiao-yong
XY
D001149:Arsenates / Q000378:metabolism*; D018053:Arsenites / Q000378:metabolism*; D001692:Biological Transport / Q000187:drug effects; D010710:Phosphates / Q000494:pharmacology*; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism; D032495:Pteris / Q000187:drug effects* / Q000378:metabolism; D012822:Silicon Dioxide; D012989:Soil Pollutants / Q000378:metabolism*
D001149:Arsenates; D018053:Arsenites; D010710:Phosphates; D012989:Soil Pollutants; D012822:Silicon Dioxide; C015001:arsenite; C025657:arsenic acid