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Calcium promotes cadmium elimination as vaterite grains by tobacco trichomes

Title data

Isaure, Marie-Pierre ; Sarret, Géraldine ; Harada, Emiko ; Choi, Yong-Eui ; Marcus, Matthew A. ; Fakra, Sirine C. ; Geoffroy, Nicolas ; Pairis, Sébastien ; Susini, Jean ; Clemens, Stephan ; Manceau, Alain:
Calcium promotes cadmium elimination as vaterite grains by tobacco trichomes.
In: Geochimica et Cosmochimica Acta. Vol. 74 (2010) Issue 20 . - pp. 5817-5834.
ISSN 0016-7037
DOI: https://doi.org/10.1016/j.gca.2010.07.011

Abstract in another language

In tobacco plants, elimination of Zn and Cd via the production of Ca-containing grains at the top of leaf hairs, called trichomes, is a potent detoxification mechanism. This study examines how Cd is incorporated in these biominerals, and how calcium growth supplementmodifies their nature. Scanning electron microscopy coupled with energy dispersive X-raymicroanalysis (SEM-EDX), microfocused X-ray diffraction (μ-XRD), and microfocused Xrayabsorption near edge structure (μ-XANES) spectroscopy were used to image the morphology of the grains, identify the crystallized mineral phases, and speciate Cd,respectively. The mineralogy of the grains and chemical form of Cd varied with the amount of Ca. When tobacco plants were grown in a nutrient solution containing 25 μM Cd and low Ca supplement (Ca/Cd = 11 mol ratio), most of the grains were oblong-shaped and low Cd substituted calcite. When exposed to the same amount of Cd and high Ca supplement (Ca/Cd = 131 mol ratio), grains were more abundant and diverse in compositions, and in total more Cd was eliminated. Most grains in the high Ca/Cd experiment were round-shaped andcomposed predominantly of Cd-substituted vaterite, a usually metastable calcium carbonatepolymorph, and subordinate calcite. Calcium oxalate and a Ca amorphous phase were detected occasionally in the two treatments, but were devoid of Cd. The biomineralization of cadmium and implications of results for Cd exposure of smokers and phytoremediation are discussed.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER86052
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Physiology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Physiology > Chair Plant Physiology - Univ.-Prof. Dr. Stephan Clemens
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 18 Jun 2015 06:35
Last Modified: 18 Jun 2015 06:35
URI: https://eref.uni-bayreuth.de/id/eprint/15153