Cited by 392Heavy metals in environmentHeavy Metals in PlantsPlant Micronutrient Interactions and Effects

Characteristics of cadmium uptake in two contrasting ecotypes of the hyperaccumulator Thlaspi caerulescens

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Zhao, Fang‐Jie, Hamon, Rebecca E., Lombi, Enzo, McLaughlin, Mike J., McGrath, Steve P.·2002·Journal of Experimental Botany

Abstract

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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Crossref · 10.1093/jexbot/53.368.535

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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.

    “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

    The section contrasting the Ganges and Prayon ecotypes (page not provided) says the Prayon Zn transporter ZNT1 mediates high-affinity Zn uptake and low-affinity Cd uptake, and may contribute to Cd uptake in that ecotype. It does not establish this mechanism for A. halleri or most T. caerulescens ecotypes; it instead says Cd uptake in Ganges probably does not share the Zn uptake system. (LLM, conf=0.88)

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Research works printed but not linked: 1

  1. Pence NS, Larsen PB, Ebbs SD, Letham DLD, Lasat MM, Garvin DF, Eide D, Kochian LV. 2000. The molecular physiology of heavy metal transporter in the ZnuCd hyper- accumulator Thlaspi caerulescens. Proceedings of the National Academy of Sciences, USA 97, 4956-4960.

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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
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
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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