Localization and speciation of Zn in mycorrihizd roots by μSXRF and μEXAFS. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal de Physique IV Proceedings Année : 2003

Localization and speciation of Zn in mycorrihizd roots by μSXRF and μEXAFS.

Résumé

Mycorrhizae are symbiotic associations between soil fungi and plant roots, which enhance mineral nutrition for the plant, and might play an important role in metals acquisition and accumulation. The processes allowing metals mobilization in the soil, absorption by the root and/or the fungus, transfer or bioaccumulation are still poorly understood. However, the properties of mycorrhizal fungi could be used for phytoremediation, a soft technique using plants for the clean-up of metal polluted soils. In this work, mycorrhized roots of tomato plants grown in a Zn-contaminated soil were investigated. The distribution of metals and the speciation of Zn were studied at the micron scale using micro synchrotron-based X-ray fluorescence (μSXRF) and micro X-ray absorption spectroscopy (μEXAFS). Zn associated to the root was Zn malate and/or Zn citrate, and Zn associated to the fungus was Zn phyllosilicate. This study illustrates the great potential of X-ray microbeams for the study of biological samples containing various amounts of metals.
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Dates et versions

hal-00105731 , version 1 (12-10-2006)

Identifiants

  • HAL Id : hal-00105731 , version 1

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Géraldine Sarret, Walter H. Schroeder, Matthew A. Marcus, Nicolas Geoffroy, Alain Manceau. Localization and speciation of Zn in mycorrihizd roots by μSXRF and μEXAFS.. Journal de Physique IV Proceedings, 2003, 107, pp.1193-1196. ⟨hal-00105731⟩
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