Ricinus communis L., Y Pseudomonas sp. PARA LA REMEDIACIÓN DE SUELOS CONTAMINADOS CON RESIDUOS DE MINA

Abstract

There is scarce information about the use of microorganisms associated to plants to remediate polluted soils with mine residues, which contain potentially toxic elements (PTE). In the current studies, hydroponic solutions or artificially contaminated soils have been used. This study considered the mixture of mine residues with soil (0%, 33%, 66% and 100%), the inoculation with Pseudomonas sp. and use of Ricinus communis. The tolerance of this bacteria to different concentrations of Cu, Zn, Cd and Pb was determined, and the capacity to form emulsions (E₂₄), parameter that is indicator of the presence of biosurfactants. In addition, the effect of the inoculation on the growth of R. communis was analyzed. Pseudomonas was tolerant to the concentrations of the PTE under study. Only Zn in 9 mM inhibited significantly its growth. All the concentrations of Cu and Zn inhibited the E₂₄. Only in the lowest concentration of Cd (0.05 mM) the emulsifying capacity was observed. Pb induced the E24 at six days of incubation. The beneficial effect of the inoculation of R. communis with Pseudomonas sp., in aerial biomass was significant at 0% and 33% of mine:soil residue. No modification