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Title:Arabidopsis halleri shows hyperbioindicator behaviour for Pb and leaf Pb accumulation spatially separated from Zn
Authors:ID Höreth, Stephan, University of Bayreuth (Author)
ID Pongrac, Paula, Uni-Lj (Author)
ID Debeljak, Marta, National Institute of Chemistry (Author)
ID Vogel-Mikuš, Katarina, Uni-Lj (Author)
ID Pečovnik, Matic, IJS (Author)
ID Vavpetič, Primož, IJS (Author)
ID Arčon, Iztok, UNG (Author)
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Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Lead (Pb) ranks among the most problematic environmental pollutants. Background contamination of soils is nearly ubiquitous, yet plant Pb accumulation is barely understood. In a survey covering 165 European populations of the metallophyte Arabidopsis halleri, several field samples had indicated Pb hyperaccumulation, offering a chance to dissect plant Pb accumulation. Accumulation of Pb was analysed in A. halleri individuals from contrasting habitats under controlled conditions to rule out aerial deposition as a source of apparent Pb accumulation. Several elemental imaging techniques were employed to study the spatial distribution and ligand environment of Pb. Regardless of genetic background, A. halleri individuals showed higher shoot Pb accumulation than A. thaliana. However, dose–response curves revealed indicator rather than hyperaccumulator behaviour. Xylem sap data and elemental imaging unequivocally demonstrated the in planta mobility of Pb. Highest Pb concentrations were found in epidermal and vascular tissues. Distribution of Pb was distinct from that of the hyperaccumulated metal zinc. Most Pb was bound by oxygen ligands in bidentate coordination. A. halleri accumulates Pb whenever soil conditions render Pb phytoavailable. Considerable Pb accumulation under such circumstances, even in leaves of A. thaliana, strongly suggests that Pb can enter food webs and may pose a food safety risk.
Keywords:Pb accumulation, XANES, EXAFS, Arabidopsis halleri
Number of pages:11 str.
PID:20.500.12556/RUNG-4983-ea54bf96-2746-72d4-fc44-a9836abdf6d4 New window
COBISS.SI-ID:33005607 New window
ISSN on article:1469-8137
DOI:10.1111/nph.16373 New window
Publication date in RUNG:16.01.2020
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Title:#The #new phytologist
Shortened title:New phytol.
Publisher:Cambridge University Press.
COBISS.SI-ID:517796633 New window


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:15.01.2020