Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/80718
Title: | Distribution and speciation of copper in rice (Oryza sativa L.) from mining-impacted paddy soil : Implications for copper uptake mechanisms | Authors: | Cui, JL Zhao, YP Lu, YJ Chan, TS Zhang, LL Tsang, DCW Li, XD |
Issue Date: | 2019 | Source: | Environment international, May 2019, v. 126, p. 717-726 | Abstract: | Long term mining activities can cause significant metal pollution in the environment, thereby showing potential risk to the paddy field. Elucidating the interfacial processes of trace metals from contaminated paddy soil to rice within the rhizosphere can provide important information on metal biogeochemistry and food safety. The current study aims to explore the spatial distribution and molecular speciation of Cu from rhizosphere to rice plant in a mining-impacted paddy soil, and reveal the possible uptake mechanisms. X-ray absorption near edge structure (XANES) analysis indicated that Cu was primarily associated with iron oxide and sulfide in soil with a minor proportion of organic complexed species. In the rice samples, Cu showed much higher concentrations in the roots than the shoots, as most Cu was sequestered in the root surface and epidermis (primarily in the form of C/N ligands bound Cu species), rather than root xylem, as identified by micro X-ray fluorescence (mu-XRF) imaging coupling with mu-XANES. By contrast, in the root xylem, thiol-S bound Cu(I) complex was observed, representing the reduced product of Cu(II) by thiol-S ligands in rice root. The absorbed Cu was probably transported from the root to the aerial part as C/N ligand bound Cu complex such as Cu-histidine like species, which was observed in the root xylem. The large retention capacity and reduction of Cu(II) in rice root alleviated Cu toxicity to rice, which was beneficial for food safety (e.g., lower concentration of Cu in rice grains). These findings showed for the first time that the uptake mechanisms by rice from field contaminated sites, which shed light on Cu detoxification process and potential remediation strategies. | Keywords: | Speciation and mobilization Paddy soil Heavy metal remediation Tolerance and detoxification Synchrotron-based X-ray absorption spectroscopy |
Publisher: | Pergamon Press | Journal: | Environment international | ISSN: | 0160-4120 | DOI: | 10.1016/j.envint.2019.02.045 | Rights: | © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/). The following publication Cui, J. L., Zhao, Y. P., Lu, Y. J., Chan, T. S., Zhang, L. L., Tsang, D. C., & Li, X. D. (2019). Distribution and speciation of copper in rice (Oryza sativa L.) from mining-impacted paddy soil: Implications for copper uptake mechanisms. Environment international, 126, 717-726 is available at https://dx.doi.org/10.1016/j.envint.2019.02.045 |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Cui_Distribution_Speciation_Copper.pdf | 1.69 MB | Adobe PDF | View/Open |
Page views
155
Last Week
1
1
Last month
Citations as of Apr 21, 2024
Downloads
124
Citations as of Apr 21, 2024
SCOPUSTM
Citations
61
Citations as of Apr 19, 2024
WEB OF SCIENCETM
Citations
53
Citations as of Apr 25, 2024
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.