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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.
Bd. 74
(2010)
Heft 20
.
- S. 5817-5834.
ISSN 0016-7037
DOI: https://doi.org/10.1016/j.gca.2010.07.011
Abstract
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.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER86052 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Pflanzenphysiologie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Pflanzenphysiologie > Lehrstuhl Pflanzenphysiologie - Univ.-Prof. Dr. Stephan Clemens Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 18 Jun 2015 06:35 |
| Letzte Änderung: | 18 Jun 2015 06:35 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/15153 |