Rhizostabilization of metals in soils using Lupinus luteus inoculated with the metal resistant rhizobacterium Serratia sp. MSMC541

Int J Phytoremediation. 2012 Mar;14(3):261-74. doi: 10.1080/15226514.2011.604693.

Abstract

The aim of this work was to test Lupinus luteus plants, inoculated with metal resistant rhizobacteria, in order to phytostabilise metals in contaminated soils. The resistance to heavy metals of strains isolated from nodules of Lupinus plants was evaluated. The strain MSMC541 showed multi-resistance to several metals (up to 13.3 mM As, 2.2 mM Cd, 2.3 mM Cu, 9 mM Pb and 30 mM Zn), and it was selected for further characterization. Furthermore, this strain was able to biosorb great amounts of metals in cell biomass. 16S rDNA sequencing positioned this strain within the genus Serratia. The presence of arsenic resistance genes was confirmed by southern blot and PCR amplification. A rhizoremediation pot experiment was conducted using Lupinus luteus grown on sand supplemented with heavy metals and inoculated with MSMC541. Plant growth parameters and metal accumulation were determined in inoculated vs. non-inoculated Lupinus luteus plants. The results showed that inoculation with MSMC541 improved the plant tolerance to metals. At the same time, metal translocation to the shoot was significantly reduced upon inoculation. These results suggest that Lupinus luteus plants, inoculated with the metal resistant strain Serratia sp. MSMC541, have a great potential for phytostabilization of metal contaminated soils.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Arsenic / metabolism*
  • Arsenic / pharmacology
  • Biodegradation, Environmental
  • DNA, Ribosomal / chemistry
  • Drug Resistance, Bacterial / genetics
  • Genes, Plant / genetics
  • Lupinus / growth & development
  • Lupinus / metabolism
  • Lupinus / microbiology*
  • Metals, Heavy / metabolism*
  • Metals, Heavy / pharmacology
  • Molecular Sequence Data
  • Nitrogen Fixation
  • Plant Shoots / metabolism
  • RNA, Ribosomal, 16S / genetics
  • Root Nodules, Plant / metabolism
  • Root Nodules, Plant / microbiology
  • Serratia / drug effects
  • Serratia / genetics
  • Serratia / growth & development
  • Serratia / physiology*
  • Soil Pollutants / metabolism*
  • Soil Pollutants / pharmacology

Substances

  • DNA, Ribosomal
  • Metals, Heavy
  • RNA, Ribosomal, 16S
  • Soil Pollutants
  • Arsenic

Associated data

  • GENBANK/JF974140