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Int J Phytoremediation ; 14(5): 518-29, 2012.
Article in English | MEDLINE | ID: mdl-22567729

ABSTRACT

Phytoremediation is a feasible alternative to remediate soils polluted with toxic elements, which can be enhanced by manipulating plant-microbe interactions. Regarding this, free-living saprophytic fungi that interact beneficially with roots have been scarcely studied. Thus, the aim of this study was to assess the effect of a saprophytic fungus, Lewia sp., on the plant growth and the ability of Dodonaea viscosa to phytoaccumulate or phytostabilize soluble and insoluble sources of lead in a solid support. The growth of D. viscosa was influenced by both Pb and Lewia sp. While seedlings exposed to Pb showed a decrease in biomass production, in seedlings grown without Pb the biomass was stimulated by Lewia sp. The fungus strongly stimulated the weight-to-length ratio in roots. Regardless of the treatment, D. viscosa accumulated 4.4-6.5 times more Pb in roots than in shoots, conducting to low translocation factors (< 0.2). The presence of Lewia sp. significantly improved Pb accumulation, achieving high bioconcentration factors (> 22), which was attributed to an increased bioavailability and uptake of Pb due to the fungus. This study demonstrated that Lewia sp. could improve Pb-phytostabilization by D. viscosa in soils polluted with soluble and insoluble forms of Pb.


Subject(s)
Ascomycota/physiology , Lead/metabolism , Sapindaceae/microbiology , Soil Pollutants/metabolism , Biodegradation, Environmental , Biological Transport , Biomass , Lead/analysis , Plant Roots/growth & development , Plant Roots/metabolism , Plant Roots/microbiology , Sapindaceae/drug effects , Sapindaceae/growth & development , Sapindaceae/metabolism , Soil
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