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Pizarro-Tobias P.,Poligono Industrial Juncaril | Niqui J.L.,Poligono Industrial Juncaril | Roca A.,Poligono Industrial Juncaril | Solano J.,Poligono Industrial Juncaril | And 4 more authors.
Environmental Microbiology Reports | Year: 2015

Petroleum waste sludges are toxic and dangerous that is why environmental protection agencies have declared their treatment top priority. Physicochemical treatments are expensive and environmentally unfriendly, while alternative biological treatments are less costly but, in general, work at a slower pace. An in situ bioremediation and rhizoremediation field-scale trial was performed in an area contaminated with oil refinery sludge under semiarid climate. The bioremediation and rhizoremediation treatments included the use of an artificial consortium made up of plant growth-promoting rhizobacteria and polycyclic aromatic hydrocarbon-degrading bacteria, and the combined use of the mentioned consortium along with pasture plants respectively. Rhizoremediation revealed that the development of vegetation favoured the evolution of indigenous microbiota with potential to remove petroleum wastes. This was inferred as the decline of total petroleum hydrocarbons 7 months after the biological treatment. © 2014 Society for Applied Microbiology and John Wiley & Sons Ltd.

Roca A.,Poligono Industrial Juncaril | Pizarro-Tobias P.,Poligono Industrial Juncaril | Udaondo Z.,Poligono Industrial Juncaril | Udaondo Z.,CSIC - Experimental Station of El Zaidin | And 8 more authors.
Environmental Microbiology | Year: 2013

Summary: Pseudomonas putida BIRD-1 is a plant growth-promoting rhizobacterium whose genome size is 5.7Mbp. It adheres to plant roots and colonizes the rhizosphere to high cell densities even in soils with low moisture. This property is linked to its ability to synthesize trehalose, since a mutant deficient in the synthesis of trehalose exhibited less tolerance to desiccation than the parental strain. The genome of BIRD-1 encodes a wide range of proteins that help it to deal with reactive oxygen stress generated in the plant rhizosphere. BIRD-1 plant growth-promoting rhizobacteria properties derive from its ability to enhance phosphorous and iron solubilization and to produce phytohormones. BIRD-1 is capable of solubilizing insoluble inorganic phosphate forms through acid production. The genome of BIRD-1 encodes at least five phosphatases related to phosphorous solubilization, one of them being a phytase that facilitates the utilization of phytic acid, the main storage form of phosphorous in plants. Pyoverdine is the siderophore produced by this strain, a mutant that in the FvpD siderophore synthase failed to grow on medium without supplementary iron, but the mutant was as competitive as the parental strain in soils because it captures the siderophores produced by other microbes. BIRD-1 overproduces indole-3-acetic acid through convergent pathways. © 2012 Society for Applied Microbiology and Blackwell Publishing Ltd.

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