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Effect of A Saprophytic Fungus on the Growth and the Lead Uptake, Translocation and Immobilization in Dodonaea Viscosa

Rojas-Loria, Cesar C., Peralta-Perez, Maria Del Rosario, Buendia-Gonzalez, Leticia, Volke-Sepulveda, Tania L.
International journal of phytoremediation 2012 v.14 no.5 pp. 518-529
Dodonaea viscosa, Lewia, bioaccumulation, bioavailability, biomass production, fungi, lead, phytoremediation, plant growth, polluted soils, roots, saprophytes, seedlings, shoots, toxic substances
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.