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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/21597

Title: Enhanced Degradation of Diesel in the Rhizosphere of Lupinus luteus after Inoculation with Diesel-Degrading and Plant Growth-Promoting Bacterial Strains
Authors: Balseiro-Romero, Maria
Gkorezis, Panagiotis
Kidd, Petra S.
Vangronsveld, Jaco
Monterroso, Carmen
Issue Date: 2016
Citation: JOURNAL OF ENVIRONMENTAL QUALITY, 45 (3), p. 924-932
Abstract: The association of plants and rhizospheric bacteria provides a successful strategy to clean up contaminated soils. The purpose of this work was to enhance diesel degradation in Lupinus luteus rhizosphere by inoculation with selected bacterial strains: a diesel degrader (D), plant growth-promoting (PGP) strains, or a combination (D+PGP). Plants were set up in pots with the A or B horizon of an umbric Cambisol (A(Camb) and B-Camb) spiked with diesel (1.25%, w/w). After 1 mo, the dissipation of diesel range organics (DRO) with respect to t = 0 (i.e., 1 wk after preparing the pots with the seedlings) concentration was significantly higher in inoculated than in noninoculated (NI) pots: The highest DRO losses were found in A(Camb) D+PGP pots (close to 15-20% higher than NI) and in B-Camb D pots (close to 10% higher). The water-extractable DRO fraction was significantly higher at t = 30 d (15-25%) compared with t = 0 (<5%), probably due to the effects of plant root exudates and biosurfactants produced by the degrader strain. The results of this experiment reflect the importance of the partnerships between plants and bacterial inoculants and demonstrate the relevance of the effect of bacterial biosurfactants and plant root exudates on contaminant bioavailability, a key factor for enhancing diesel rhizodegradation. The association of lupine with D and PGP strains resulted in a promising combination for application in the rhizoremediation of soils with moderate diesel contamination.
Notes: [Balseiro-Romero, Maria; Monterroso, Carmen] Univ Santiago de Compostela, Dept Soil Sci & Agr Chem, Campus Vida, Santiago De Compostela 15782, Spain. [Gkorezis, Panagiotis; Vangronsveld, Jaco] Univ Hasselt, Ctr Environm Sci, Agoralaan Bldg B, B-3590 Diepenbeek, Belgium. [Kidd, Petra S.] CSIC, IIAG, Santiago De Compostela 15780, Spain.
URI: http://hdl.handle.net/1942/21597
DOI: 10.2134/jeq2015.09.0465
ISI #: 000375159700021
ISSN: 0047-2425
Category: A1
Type: Journal Contribution
Validation: ecoom, 2017
Appears in Collections: Research publications

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