期刊
ENVIRONMENTAL POLLUTION
卷 161, 期 -, 页码 1-7出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.09.017
关键词
Arsenic hyperaccumulator; Micro-XANES; Phosphate; Pteris vittata L.; SRXRF
资金
- National Natural Science Foundation of China [41071215]
- Natural Science Foundation of China-Guangdong Joint Foundation of China [U0833004]
- Chinese Academy of Sciences [KZCX2-YW-Q02-02]
Arsenic (As) reduction and translocation are key processes for As hyperaccumulation by the hyperaccumulator Pteris vittata L Micro-X-ray adsorption spectroscopy of P. vittata's rhizoid tissues revealed that As reduction mainly occurred in endodermis during translocation from epidermis to vascular bundle. Prior to reduction, arsenate (As (V)) translocation was an active process requiring energy and employing a phosphate (P) transporter. Use of a synchrotron X-ray microprobe showed that As (V) and P were cotransported and that this process could be enhanced by As (V) exposure or P deficiency but restrained by energy release inhibition caused by 2,4-dinitrophenol or sodium orthovanadate. In contrast, after As reduction, As(III) translocation differed from P translocation and was more efficient, appearing free from the apparent endodermal blockage. The results here revealed the role of the P transporter on As translocation as well as the key role of As reduction in As hyperaccumulation by P. vittata. (C) 2011 Elsevier Ltd. All rights reserved.
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