| Accumulation and fractionation of rare earth elements (REEs) in wheat: controlled by phosphate precipitation, cell wall absorption and solution complexation. | |
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MedLine Citation:
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PMID: 16131504 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Previous studies on rare earth element (REE) bioaccumulation have focused on their accumulation rate and fractionation, but the processes involved remain unclear. In this study, the accumulation and fractionation of REEs in wheat (Triticum aestivum L.) were investigated using solution culture with exogenous mixed REEs. A decrease in REE contents was observed from the roots to the tops of wheat. Significant fractionations of REEs were found in wheat organs as compared to the exogenous mixed REEs. Middle REE (MREE, the elements from Sm to Gd) enrichment and an M-type tetrad effect (an effect that can cause a split of REE patterns into four consecutive convex segments) were observed in the roots, which were probably caused by phosphate precipitation of REEs in/on the roots and absorption of REEs to root cell walls. Light REE (LREE, the elements from La to Eu) and heavy REE (HREE, the elements from Gd to Lu) enrichments were observed in the stems and leaves, respectively, accompanied by conspicuous W-type tetrad effects (an opposite effect to the M-type tetrad effect) in the REE patterns. HREE enrichment decreased from the older to the younger leaves and increased upwards within a single leaf. It is suggested that the solution complexation that occurred in the xylem vessels plays an important role in REE fractionations in the above-ground parts of wheat. |
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Authors:
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Shiming Ding; Tao Liang; Chaosheng Zhang; Juncai Yan; Zili Zhang |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2005-08-30 |
Journal Detail:
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Title: Journal of experimental botany Volume: 56 ISSN: 0022-0957 ISO Abbreviation: J. Exp. Bot. Publication Date: 2005 Oct |
Date Detail:
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Created Date: 2005-09-15 Completed Date: 2005-12-02 Revised Date: 2009-11-19 |
Medline Journal Info:
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Nlm Unique ID: 9882906 Medline TA: J Exp Bot Country: England |
Other Details:
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Languages: eng Pagination: 2765-75 Citation Subset: IM |
Affiliation:
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Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Cell Wall
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metabolism* Chemical Precipitation Metals, Rare Earth / metabolism* Phosphates / metabolism* Plant Leaves / metabolism Plant Stems / metabolism Solutions / chemistry* Triticum / cytology*, metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Metals, Rare Earth; 0/Phosphates; 0/Solutions |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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