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Environmental Pollution
Vol. 130, No. xx, 2004; Pages: 427-436


Arbuscular mycorrhizal fungi can decrease the uptake of uranium by subterranean clover grown at high levels of uranium in soil

Gervais Rufyikiria,*, Lien Huysmansa, Jean Wannijna, May Van Heesa, Corinne Leyvalb, Iver Jakobsenc

Belgian Nuclear Research Centre (SCKeCEN), Radiation Protection Research Department,
Radioecology Section, Boeretang 200, 2400 Mol, Belgium.


Abstract

Subterranean clover inoculated or not with the arbuscular mycorrhizal (AM) fungus Glomus intraradices was grown on soil containing six levels of 238U in the range 0-87 mg kg-1. Increasing U concentration in soil enhanced the U concentration in roots and shoots of both mycorrhizal and nonmycorrhizal plants but had no significant effects on plant dry matter production or root AM colonization. Mycorrhizas increased the shoot dry matter and P concentration in roots and shoots, while in most cases, it decreased the Ca, Mg and K concentrations in plants. The AM fungus influenced U concentration in plants only in the treatment receiving 87 mg U kg-1 soil. In this case, U concentration in shoots of nonmycorrhizal plants was 1.7 times that of shoots of mycorrhizal plants. These results suggested that mycorrhizal fungi can limit U accumulation by plants exposed to high levels of U in soil.

Keywords: 238U, Mycorrhizal fungi, Uptake, Radionuclides, Plant,arbuscular mycorrhizal,Glomus intraradices,nonmycorrhizal plants,radionuclides.


Corresponding author: Tel +32-14-33-21-16; fax +32-14-32- 10-56

E-mail: grufyiki@sckcen.be (G. Rufyikiri)

 

 
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