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Characteristics of cadmium uptake in two contrasting ecotypes of the hyperaccumulator Thlaspi caerulescens
Open accessAbstract
Uptake of Cd and Zn by intact seedlings of two contrasting ecotypes of the hyperaccumulator Thlaspi caerulescens was characterized using radioactive tracers. Uptake of Cd and Zn at 2 degrees C was assumed to represent mainly apoplastic binding in the roots, whereas the difference in uptake between 22 degrees C and 2 degrees C represented metabolically dependent influx. There was no significant difference between the two ecotypes in the apoplastic binding of Cd or Zn. Metabolically dependent uptake of Cd was 4.5-fold higher in the high Cd-accumulating ecotype, Ganges, than in the low Cd-accumulating ecotype, Prayon. By contrast, there was only a 1.5-fold difference in the Zn uptake between the two ecotypes. For the Ganges ecotype, Cd uptake could be described by Michaelis-Menten kinetics with a V(max) of 143 nmol g(-1) root FW h(-1) and a K(m) of 0.45 microM. Uptake of Cd by the Ganges ecotype was not inhibited by La, Zn, Cu, Co, Mn, Ni or Fe(II), and neither by increasing the Ca concentration. By contrast, addition of La, Zn or Mn, or increasing the Ca concentration in the uptake solution decreased Cd uptake by Prayon. Uptake of Ca was larger in Prayon than in Ganges. The results suggest that Cd uptake by the low Cd-accumulating ecotype (Prayon) may be mediated partly via Ca channels or transporters for Zn and Mn. By contrast, there may exist a highly selective Cd transport system in the root cell membranes of the high Cd-accumulating ecotype (Ganges) of T. caerulescens.
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“Although Zn transporters mediate the uptake of Cd in A. halleri and most ecotypes of T. caerulescens, Zn is preferably being transported over Cd (Zhao et al., 2002).”
From Plant hyperaccumulators: a state-of-the-art review on mechanism of heavy metal transport and sequestration (2025) · cites this paper as Zhao et al., 2002
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BackgroundInfluential
Metadata
- Authors
- Zhao, F., Hamon, R. E., Lombi, E., McLaughlin, M. J., & McGrath, S. P.
- Affiliations
- Commonwealth Scientific and Industrial Research Organisation (AU)
- Rothamsted Research (GB)
- Venue
- Journal of Experimental Botany
- Publisher
- Oxford University Press (OUP)
- Published
- 2002-03-01
- Volume
- 53
- Issue
- 368
- Pages
- 535-543
- ISSN
- 0022-0957 (ISSN-L)
- 1460-2431
- OpenAlex
- W2170171915
- Cited by
- 385
- References
- 38
- Citations by year
- 2026: 10 · 2025: 4 · 2024: 11 · 2023: 18 · 2022: 7 · 2021: 8 · 2020: 18 · 2019: 18 · 2018: 8 · 2017: 18 · 2016: 13 · 2015: 20 · 2014: 22 · 2013: 15 · 2012: 18
- FWCI
- 18.90
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Experimental Botany (publishedVersion)
- PubMed (publishedVersion)
- Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
- Rothamsted Repository (Rothamsted Repository) (submittedVersion)
- Funders
- European Commission
- Grains Research and Development Corporation
- Directorate for Biological Sciences
- Biotechnology and Biological Sciences Research Council
- Topics
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Physical Sciences › Chemistry › Analytical Chemistry › Heavy Metals in Plants
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Micronutrient Interactions and Effects
- Keywords
- Thlaspi caerulescens, cadmium uptake, zinc uptake, root ion transport, calcium channels, metal transporters, Michaelis-Menten kinetics, cadmium tolerance, lanthanum inhibition, manganese inhibition
- MeSH terms
- Binding Sites, Cadmium, Cadmium Radioisotopes, Calcium, Calcium Channel Blockers, Cations, Divalent, Cell Wall, Kinetics, Species Specificity, Verapamil, Zinc, Zinc Radioisotopes, Plant Roots, Brassicaceae
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