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题名: Accumulation and uptake of light rare earth elements in a hyperaccumulator Dicropteris dichotoma
作者: Shan, XQ;  Wang, HI;  Zhang, SZ;  Zhou, HF;  Zheng, Y;  Yu, H;  Wen, B
关键词: hyperaccumulator Dicropteris dichotoma ;  light rare earth elements ;  LREE-binding peptides
刊名: PLANT SCIENCE
发表日期: 2003-12-01
DOI: 10.1016/S0168-9452(03)00361-3
卷: 165, 期:6, 页:1343-1353
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Life Sciences & Biomedicine
类目[WOS]: Biochemistry & Molecular Biology ;  Plant Sciences
研究领域[WOS]: Biochemistry & Molecular Biology ;  Plant Sciences
英文摘要: Dicropteris dichotoma, a natural perennial fern, grows in acidic soil in southern China. It hyperaccumulates several light rare earth elements La, Ce, Pr and Nd (LREEs) up to about 0.7% of its dry leaf biomass. Through electron microscopic and X-ray microanalyses, LREEs deposits were observed in the cell wall, intercellular space, plasmalemma, vesicles and vacuoles of the root endodermis and stele cells but not in the Casparian band of the fern adventitious root. In addition, LREE deposits were observed in the phloem and xylem of the fern rhizome. These results indicate that at least a portion of the LREEs can be transported symplastically. Histidine and organic acids appear to play a role in stimulating the accumulation of LREEs. This was evident in ferns cultivated in soil amended by histidine, malic and citric acids over a 60-day period. Concentrations of LREEs in D. dichotoma leaves increased by 21-78% as opposed to control, which only increased by 6-10%. While this suggests that histidine and organic acids promote the uptake and sequestration of LREEs in D. dichotoma, the enhancement mechanism of each acid appears to differ. Histidine promoted sequestration of LREEs by forming complexes with LREEs in cells. Organic acids, however, increased the release of LREE from soil, and the uptake of LREEs by fern roots. Most of the LREEs (81-89%) in the cell wall are the result of one of these mechanisms involved in LREE hyperaccumulation. Mass analysis indicated that the molecular weight of LREE-binding peptides was approximately 2000. (C) 2003 Elsevier Ireland Ltd. All rights reserved.
关键词[WOS]: LOW-MOLECULAR-WEIGHT ;  THLASPI-CAERULESCENS ;  ORGANIC-ACIDS ;  NATURAL PLANT ;  METAL ACCUMULATION ;  ZINC PHYTATE ;  CORN ROOTS ;  NICKEL ;  TRANSPORT ;  BINDING
语种: 英语
WOS记录号: WOS:000186711500020
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138381
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
3.CUNY Queens Coll, Sch Earth & Environm Sci, Flushing, NY 11367 USA

Recommended Citation:
Shan, XQ,Wang, HI,Zhang, SZ,et al. Accumulation and uptake of light rare earth elements in a hyperaccumulator Dicropteris dichotoma[J]. PLANT SCIENCE,2003,165(6):1343-1353.
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