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Effects of arbuscular mycorrhizal fungi on the root uptake and translocation of radiocaesium

Authors
Journal
Environmental Pollution
0269-7491
Publisher
Elsevier
Publication Date
Volume
134
Issue
3
Identifiers
DOI: 10.1016/j.envpol.2004.08.015
Keywords
  • Radiocaesium
  • Monoxenic Culture
  • Arbuscular Mycorrhizal Fungi
  • Transport
  • Sequestration
Disciplines
  • Biology
  • Ecology
  • Geography

Abstract

Abstract Because mycorrhizal fungi are intimately associated with plant roots, their importance in radionuclide (RN) recycling and subsequent dispersion into the biosphere has received an increasing interest. Recently, the capacity of arbuscular mycorrhizal fungi to take up and translocate radiocaesium to their host was demonstrated. However, the relative contribution of these processes in comparison to the ones of roots remains unknown. Here, the respective contributions of the hyphae of a Glomus species and the transformed carrot ( Daucus carota L.) roots on radiocaesium uptake and translocation were compared and quantified. We observed that radiocaesium uptake by hyphae was significantly lower as compared to that of the roots, while the opposite was noted for radiocaesium translocation/uptake ratio. We also observed that the intraradical fungal structures might induce a local accumulation of radiocaesium and concurrently reduce its translocation within mycorrhizal roots. We believe that intraradical fungal structures might induce the down-regulation of radiocaesium channels involved in the transport processes of radiocaesium towards the xylem.

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