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Fluorescent pseudomonads occurring in Macrotermes subhyalinus mound structures decrease Cd toxicity and improve its

R Duponnois1, M Kisa, K Assigbetse

  • 1IRD, UMR 113 CIRAD/INRA/IRD/AGRO-M/UM2, Laboratoire des Symbioses Tropicales et Méditerranéennes, LSTM, 34398 Montpellier, Cedex 05, France. robin.duponnois@ird.sn

The Science of the Total Environment
|September 23, 2006
PubMed
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Metal-tolerant fluorescent pseudomonads isolated from termite mounds enhance sorghum growth and cadmium uptake. These bacteria promote arbuscular mycorrhizal colonization in contaminated soil, aiding in bioremediation efforts.

Area of Science:

  • Environmental Microbiology
  • Soil Science
  • Bioremediation

Background:

  • Termite mound soil harbors diverse microbial communities.
  • Metal-tolerant bacteria, particularly fluorescent pseudomonads, are found in these unique environments.
  • Cadmium contamination poses a significant threat to soil health and plant growth.

Purpose of the Study:

  • To isolate and identify cadmium-tolerant fluorescent pseudomonads from termite mound soil.
  • To evaluate the efficacy of these bacterial isolates in enhancing sorghum plant growth and cadmium uptake.
  • To investigate the impact of bacterial inoculation on arbuscular mycorrhizal colonization in cadmium-contaminated soil.

Main Methods:

  • Isolation and characterization of fluorescent pseudomonad strains from Macrotermes subhyalinus termite mound soil.

Related Experiment Videos

  • Greenhouse experiments inoculating Sorghum bicolor with isolated bacteria in cadmium-spiked soil.
  • Assessment of plant biomass, root and shoot growth, and cadmium uptake.
  • Measurement of arbuscular mycorrhizal (AM) colonization.
  • Analysis of microbial functional diversity using in situ catabolic potential assays.

    • Main Results:

    • Isolated bacterial strains, primarily Pseudomonas monteillii, exhibited tolerance to cadmium.
    • Inoculation with fluorescent pseudomonads significantly improved shoot and total biomass of sorghum plants.
    • Bacterial inoculation enhanced cadmium uptake by sorghum plants.
    • Fluorescent pseudomonads significantly increased arbuscular mycorrhizal colonization in cadmium-contaminated soil.
    • Microbial communities in inoculated soils showed altered metabolic potentials, favoring utilization of specific organic acids.

    Conclusions:

    • Termite mound soil is a rich source of metal-tolerant fluorescent pseudomonads with bioremediation potential.
    • Fluorescent pseudomonads can enhance plant growth and metal phytoextraction in contaminated soils.
    • These bacteria play a role in improving soil microbial community structure and function.
    • This study highlights the potential of using termite mound-derived bacteria for the bioremediation of metal-contaminated sites.