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Title:Cadmium associates with oxalate in calcium oxalate crystals and competes with calcium for translocation to stems in the cadmium bioindicator Gomphrena claussenii
Authors:ID Pongrac, Paula, Biotechnical Faculty, University of Ljubljana (Author)
ID Serra, Tania, Laboratory of Genetics, Wageningen University and Research (Author)
ID Castillo Michel, Hiram, European Synchrotron Radiation Facility, Grenoble (Author)
ID Vogel-Mikuš, Katarina, Biotechnical Faculty, University of Ljubljana (Author)
ID Arčon, Iztok, UNG (Author)
ID Klemen, Mitja, Jozef Stefan Institute (Author)
ID Jencic, Boštjan, Jozef Stefan Institute (Author)
ID Kavčič, Anja, Biotechnical Faculty, University of Ljubljana (Author)
ID Villafort Carvalho, Mina T., Laboratory of Genetics, Wageningen University and Research (Author)
ID Aarts, Mark G. M., Laboratory of Genetics, Wageningen University and Research (Author)
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Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Cadmium (Cd) was shown to co-localise with calcium (Ca) in oxalate crystals in the stems and leaves of Cd tolerant Gomphrena claussenii, but Cd binding remained unresolved. Using synchrotron radiation X-ray absorption near edge spectroscopy we demonstrate that in oxalate crystals of hydroponically grown G. claussenii the vast majority of Cd is bound to oxygen ligands in oxalate crystals (488%; Cd–O–C coordination) and the remaining Cd is bound to sulphur ligands (Cd–S–C coordination). Cadmium binding to oxalate does not depend on the amount of Ca supplied or from which organs the crystals originate (stems and mature leaves). By contrast, roots contain no oxalate crystals and therein Cd is bound predominantly by S ligands. The potential to remove Cd by extraction of Cd-rich oxalate crystals from plant material should be tested in phytoextraction or phytomining strategies.
Keywords:Cd XANES, Cd oxalate, Gomphrena claussenii
Publication version:Version of Record
Year of publishing:2018
Number of pages:9
PID:20.500.12556/RUNG-4057-fc131a59-1c4b-ab1a-6725-d52e8d48c4a0 New window
COBISS.SI-ID:4794703 New window
DOI:10.1039/c8mt00149a New window
Publication date in RUNG:06.09.2018
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Publisher:Royal Society of Chemistry
Year of publishing:2018