Thallium stable isotope fractionation in white mustard: Implications for metal transfers and incorporation in plants

Vaněk, Aleš; Holubík, Ondřej; Oborná, Vendula; Mihaljevič, Martin; Trubač, Jakub; Ettler, Vojtěch; Pavlů, Lenka; Vokurková, Petra; Penížek, Vít; Zádorová, Tereza; Voegelin, Andreas

doi:10.1016/j.jhazmat.2019.02.060

Cited by 28 publications

(6 citation statements)

References 39 publications

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“…12,34 In Sinapis alba (white mustard), XANES analysis reported spectra similar to aqueous Tl(I) and Tl(I)-acetate; S-coordinated Tl(I) spectra were not related to the plant Tl spectra. 50 In our study, the Tl L III edge XANES spectra of hydrated Brassica samples (ID 10 and ID 11 cultivars) showed that Tl(I) predominates in the aqueous as well as in the solid form (Table S4). This solid form was observed in Tl-enriched crystals in SEM-EDS analysis (Figure 5) and found in inclusions in the margins of fresh leaves (Figure 4).…”

Section: ■ Resultssupporting

confidence: 49%

Mechanisms of Uptake and Translocation of Thallium in Brassica Vegetables: An X-ray Fluorescence Microspectroscopic Investigation

Corzo-Remigio,

Harris,

Kidman

et al. 2024

Environ. Sci. Technol.

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Most nonoccupational human exposure to thallium (Tl) occurs via consumption of contaminated food crops. Brassica cultivars are common crops that can accumulate more than 500 μg Tl g −1 . Knowledge of Tl uptake and translocation mechanisms in Brassica cultivars is fundamental to developing methods to inhibit Tl uptake or conversely for potential use in phytoremediation of polluted soils. Brassica cultivars (25 in total) were subjected to Tl dosing to screen for Tl accumulation. Seven high Tl-accumulating varieties were selected for follow-up Tl dosing experiments. The highest Tl accumulating Brassica cultivars were analyzed by synchrotron-based micro-X-ray fluorescence to investigate the Tl distribution and synchrotron-based X-ray absorption near-edge structure spectroscopy (XANES) to unravel Tl chemical speciation. The cultivars exhibited different Tl tolerance and accumulation patterns with some reaching up to 8300 μg Tl g −1 . The translocation factors for all the cultivars were >1 with Brassica oleracea var. acephala (kale) having the highest translocation factor of 167. In this cultivar, Tl is preferentially localized in the venules toward the apex and along the foliar margins and in minute hot spots in the leaf blade. This study revealed through scanning electron microscopy and X-ray fluorescence analysis that highly Tlenriched crystals occur in the stoma openings of the leaves. The finding is further validated by XANES spectra that show that Tl(I) dominates in the aqueous as well as in the solid form. The high accumulation of Tl in these Brassica crops has important implications for food safety and results of this study help to understand the mechanisms of Tl uptake and translocation in these crops.

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Section: ■ Resultssupporting

confidence: 49%

Mechanisms of Uptake and Translocation of Thallium in Brassica Vegetables: An X-ray Fluorescence Microspectroscopic Investigation

Corzo-Remigio,

Harris,

Kidman

et al. 2024

Environ. Sci. Technol.

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Section: Isotope Fractionation In Plantsmentioning

confidence: 99%

“…White mustard grown in hydroponics preferentially took up light isotopes (Δ 205 TI plant-source −0.20 to −0.09‰) while heavy isotopes were transported from roots to shoots, particularly at high Tl supply (Δ 205 Tl shoot-root −0.07 to +0.72‰, Vaněk et al, 2019 ). Within shoots, Tl isotope fractionation reached Δ 205 Tl shoot-root of 0.43‰ ( Kersten et al, 2014 ; Rader et al, 2019 ; Vaněk et al, 2019 ). Although there is no known biological function for Tl, it has been posited that the isotope fractionation between roots and shoots is due to physiologically controlled translocation which may be related to membrane transport and Tl speciation.…”

Section: Isotope Fractionation In Plantsmentioning

confidence: 99%

“…Although there is no known biological function for Tl, it has been posited that the isotope fractionation between roots and shoots is due to physiologically controlled translocation which may be related to membrane transport and Tl speciation. Since Tl + and K + have similar ionic radii (1.76 Å and 1.60 Å), it has also been suggested that Tl uses K channels to translocate ( Vaněk et al, 2019 ). In addition, Tl in plants appears to be mostly present as Tl(I)aq and Tl-acetate (O-ligand) in roots, stems, and leaves.…”

Section: Isotope Fractionation In Plantsmentioning

confidence: 99%

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Stable Isotope Fractionation of Metals and Metalloids in Plants: A Review

et al. 2022

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This work critically reviews stable isotope fractionation of essential (B, Mg, K, Ca, Fe, Ni, Cu, Zn, Mo), beneficial (Si), and non-essential (Cd, Tl) metals and metalloids in plants. The review (i) provides basic principles and methodologies for non-traditional isotope analyses, (ii) compiles isotope fractionation for uptake and translocation for each element and connects them to physiological processes, and (iii) interlinks knowledge from different elements to identify common and contrasting drivers of isotope fractionation. Different biological and physico-chemical processes drive isotope fractionation in plants. During uptake, Ca and Mg fractionate through root apoplast adsorption, Si through diffusion during membrane passage, Fe and Cu through reduction prior to membrane transport in strategy I plants, and Zn, Cu, and Cd through membrane transport. During translocation and utilization, isotopes fractionate through precipitation into insoluble forms, such as phytoliths (Si) or oxalate (Ca), structural binding to cell walls (Ca), and membrane transport and binding to soluble organic ligands (Zn, Cd). These processes can lead to similar (Cu, Fe) and opposing (Ca vs. Mg, Zn vs. Cd) isotope fractionation patterns of chemically similar elements in plants. Isotope fractionation in plants is influenced by biotic factors, such as phenological stages and plant genetics, as well as abiotic factors. Different nutrient supply induced shifts in isotope fractionation patterns for Mg, Cu, and Zn, suggesting that isotope process tracing can be used as a tool to detect and quantify different uptake pathways in response to abiotic stresses. However, the interpretation of isotope fractionation in plants is challenging because many isotope fractionation factors associated with specific processes are unknown and experiments are often exploratory. To overcome these limitations, fundamental geochemical research should expand the database of isotope fractionation factors and disentangle kinetic and equilibrium fractionation. In addition, plant growth studies should further shift toward hypothesis-driven experiments, for example, by integrating contrasting nutrient supplies, using established model plants, genetic approaches, and by combining isotope analyses with complementary speciation techniques. To fully exploit the potential of isotope process tracing in plants, the interdisciplinary expertise of plant and isotope geochemical scientists is required.

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“…The bioavailability of Tl in soil depends on the specific sorption, mainly onto specific Mn oxide, birnessite (δ-MnO 2 ) and illite [(K,H 3 O)Al 2 (Al,Si) 4 O 10 (OH) 2 ], being probably the most important Tl scavengers and the general stability of Tl-host phase (Al-Najar et al 2003;Vaněk et al 2013;Grösslová et al 2015). Possibly incongruent leaching of Tl from the soil to the biological/plant material may refer to the Mn-Tl association (Vaněk et al 2019). The physiological availability of Tl into the plant depends mostly on the crop species, storage organ structure, accessibility of plant exudates, state of enzymatic processes, and plant growing strategy (Merian & Clarkson 1991).…”

mentioning

confidence: 99%

Thallium uptake/tolerance in a model (hyper)accumulating plant: Effect of extreme contaminant loads

Holubík¹,

Vaněk²,

Mihaljevič³

et al. 2021

Soil & Water Res.

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Thallium (Tl) is a toxic trace element with a highly negative effect on the environment. For phytoextraction purposes, it is important to know the limitations of plant growth. In this study, we conducted experiments with a model Tl-hyperaccumulating plant (Sinapis alba L., white mustard) to better understand the plant tolerance and/or associated detoxification mechanisms under extreme Tl doses (accumulative 0.7/1.4 mg Tl, in total). Both the hydroponic/semi-hydroponic (artificial soil) cultivation variants were studied in detail. The Tl bioaccumulation potential for the tested plant reached up to 1% of the total supplied Tl amount. Furthermore, it was revealed that the plants grown in the soil-like system did not tolerate Tl concentrations in nutrient solutions higher than ~1 mg/L, i.e., wilting symptoms were evident. Surprisingly, for the plants grown in hydroponic solutions, the tolerable Tl concentration was by contrast at least 2-times higher (≥ 2 mg Tl/L), presumably mimicking the K biochemistry. The obtained hydroponic/semi-hydroponic phytoextraction data can serve, in combination, as a model for plant-assisted remediation of soils or mining/processing wastes enriched in Tl, or possibly for environmental cycling of Tl in general.

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Thallium stable isotope fractionation in white mustard: Implications for metal transfers and incorporation in plants

Cited by 28 publications

References 39 publications

Mechanisms of Uptake and Translocation of Thallium in Brassica Vegetables: An X-ray Fluorescence Microspectroscopic Investigation

Mechanisms of Uptake and Translocation of Thallium in Brassica Vegetables: An X-ray Fluorescence Microspectroscopic Investigation

Stable Isotope Fractionation of Metals and Metalloids in Plants: A Review

Thallium uptake/tolerance in a model (hyper)accumulating plant: Effect of extreme contaminant loads

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