Phytoextraction of heavy metal polluted soils using Sedum plumbizincicola inoculated with metal mobilizing Phyllobacterium myrsinacearum RC6b

• Published in: Chemosphere (Oxford) Vol. 93; no. 7; pp. 1386 - 1392
• Main Authors: Ma, Ying, Rajkumar, Mani, Luo, Yongming, Freitas, Helena
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-10-2013; Elsevier
• Subjects: 1-aminocyclopropane-1-carboxylate deaminase; Applied sciences; bacteria; Biodegradation of pollutants; Biodegradation, Environmental; Biological and medical sciences; Biotechnology; Cadmium; Decontamination. Miscellaneous; Environment and pollution; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; heavy metals; indole acetic acid; Industrial applications and implications. Economical aspects; Lead; Metals, Heavy - analysis; Metals, Heavy - metabolism; Phyllobacteriaceae - physiology; Phyllobacterium myrsinacearum; Phytoremediation; plant growth; Plant growth-promoting rhizobacterium; polluted soils; Pollution; Sedum; Sedum - physiology; Sedum plumbizincicola; siderophores; Soil and sediments pollution; Soil Pollutants - analysis; Soil Pollutants - metabolism; solubilization; zinc; Lead; Cadmium; Phyllobacterium myrsinacearum; Sedum plumbizincicola; Plant growth-promoting rhizobacterium; Phytoremediation; Crassulaceae; Transition metal; Soil pollution; Phytoextraction; Heavy metal; Trace element; Succulent plant; Bacterium; Decontamination; Dicotyledones; Angiospermae; Bacteria; Spermatophyta; Plant growth promoting rhizobacteria; Bioremediation
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2013.06.077

•Isolated Phyllobacterium myrsinacearum RC6b effectively mobilized metals in soils.•RC6b inoculation enhanced growth and Cd and Zn uptake of Sedum plumbizincicola.•Possible mechanisms are plant beneficial activities and soil metal mobilization.•RC6b is a good candidate for microbially assisted phytoremediation.
The aim of this study was to investigate the effects of metal mobilizing plant-growth beneficial bacterium Phyllobacterium myrsinacearum RC6b on plant growth and Cd, Zn and Pb uptake by Sedum plumbizincicola under laboratory conditions. Among a collection of metal-resistant bacteria, P. myrsinacearum RC6b was specifically chosen as a most favorable metal mobilizer based on its capability of mobilizing high concentrations of Cd, Zn and Pb in soils. P. myrsinacearum RC6b exhibited a high degree of resistance to Cd (350mgL−1), Zn (1000mgL−1) and Pb (1200mgL−1). Furthermore, P. myrsinacearum RC6b showed multiple plant growth beneficial features including the production of 1-aminocyclopropane-1-carboxylic acid deaminase, indole-3-acetic acid, siderophore and solubilization of insoluble phosphate. Inoculation of P. myrsinacearum RC6b significantly increased S. plumbizincicola growth and organ metal concentrations except Pb, which concentration was lower in root and stem of inoculated plants. The results suggest that the metal mobilizing P. myrsinacearum RC6b could be used as an effective inoculant for the improvement of phytoremediation in multi-metal polluted soils.