Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/74810
Title: Role of chelant on Cu distribution and speciation in Lolium multiflorum by synchrotron techniques
Authors: Zhao, YP 
Cui, JL 
Chan, TS
Dong, JC
Chen, DL
Li, XD 
Keywords: Copper
EDDS
Micro XRF
Phytoextraction
X-ray absorption spectroscopy
Issue Date: 2018
Publisher: Elsevier B.V.
Source: Science of the total environment, 2018, v. 621, p. 772-781 How to cite?
Journal: Science of the total environment 
Abstract: Chelants are known to enhance metal translocation in plants; however, the underlying mechanisms are still not fully understood. This study aimed to elucidate the distribution and speciation of Cu in ryegrass (Lolium multiflorum) in both absence and presence of the biodegradable chelant [S,S′]-ethylenediamine disuccinic acid (EDDS). The results showed that EDDS increased the Cu translocation factor from root to shoot by 6–9 folds under CuEDDS in comparison with free Cu (50–250 μM). Synchrotron-based microscopic X-ray fluorescence (μ-XRF) mapping revealed that EDDS alleviated Cu deposition in the root meristem of root apex and the junction of lateral root zone, and facilitated Cu transport to root stele for subsequent translocation upwards. X-ray absorption near edge structure (XANES) analysis found that free Cu was sequestered in plants as a mixture of Cu-organic ligands. In the EDDS treatment, Cu was primarily present as CuEDDS (49–67%) in plants with partial chemical transformation to Cu-histidine (21–36%) and Cu(I)-glutathione (0–24%). These results suggest that EDDS improves internal Cu mobility through forming CuEDDS, thus decreasing the root sequestration of Cu, and ultimately facilitating Cu transport to plant shoots.
URI: http://hdl.handle.net/10397/74810
ISSN: 0048-9697
EISSN: 1879-1026
DOI: 10.1016/j.scitotenv.2017.11.189
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

Page view(s)

30
Citations as of Dec 17, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.