1. Soil phenanthrene phytoremediation capacity in bacteria-assisted Spartina densiflora.
- Author
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Mesa-Marín J, Barcia-Piedras JM, Mateos-Naranjo E, Cox L, Real M, Pérez-Romero JA, Navarro-Torre S, Rodríguez-Llorente ID, Pajuelo E, Parra R, and Redondo-Gómez S
- Subjects
- Biodegradation, Environmental, Endophytes metabolism, Photosynthesis, Poaceae microbiology, Salt-Tolerant Plants microbiology, Soil Microbiology, Wetlands, Bacteria metabolism, Phenanthrenes analysis, Poaceae metabolism, Salt-Tolerant Plants metabolism, Soil chemistry, Soil Pollutants analysis
- Abstract
Polycyclic aromatic hydrocarbons (PAH) have become a threat for the conservation of wetlands worldwide. The halophyte Spartina densiflora has shown to be potentially useful for soil phenanthrene phytoremediation, but no studies on bacteria-assisted hydrocarbon phytoremediation have been carried out with this halophyte. In this work, three phenanthrene-degrading endophytic bacteria were isolated from S. densiflora tissues and used for plant inoculation. Bacterial bioaugmentation treatments slightly improved S. densiflora growth, photosynthetic and fluorescence parameters. But endophyte-inoculated S. densiflora showed lower soil phenanthrene dissipation rates than non-inoculated S. densiflora (30% below) or even bulk soil (23% less). Our work demonstrates that endophytic inoculation on S. densiflora under greenhouse conditions with the selected PAH-degrading strains did not significantly increase inherent phenanthrene soil dissipation capacity of the halophyte. It would therefore be advisable to provide effective follow-up of bacterial colonization, survival and metabolic activity during phenanthrene soil phytoremediation., (Copyright © 2019 Elsevier Inc. All rights reserved.)
- Published
- 2019
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