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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/23229

Title: The Interaction between Plants and Bacteria in the Remediation of Petroleum Hydrocarbons: An Environmental Perspective
Authors: Gkorezis, Panagiotis
Daghio, Matte
Franzetti, Andrea
Van Hamme, Jonathan D.
Sillen, Wouter
Vangronsveld, Jaco
Issue Date: 2016
Publisher: FRONTIERS MEDIA SA
Citation: FRONTIERS IN MICROBIOLOGY, 7 (Art N° 1836)
Abstract: Widespread pollution of terrestrial ecosystems with petroleum hydrocarbons (PHGs) has generated a need for remediation and, given that many PHCs are biodegradable, bio- and phyto-remediation are often viable approaches for active and passive remediation. This review focuses on phytoremediation with particular interest on the interactions between and use of plant-associated bacteria to restore PHC polluted sites. Plant-associated bacteria include endophytic, phyllospheric, and rhizospheric bacteria, and cooperation between these bacteria and their host plants allows for greater plant survivability and treatment outcomes in contaminated sites. Bacterially driven PHC bioremediation is attributed to the presence of diverse suites of metabolic genes for aliphatic and aromatic hydrocarbons, along with a broader suite of physiological properties including biosurfactant production, biofilm formation, chemotaxis to hydrocarbons, and flexibility in cell-surface hydrophobicity. In soils impacted by PHC contamination, microbial bioremediation generally relies on the addition of high-energy electron acceptors (e.g., oxygen) and fertilization to supply limiting nutrients (e.g., nitrogen, phosphorous, potassium) in the face of excess PHC carbon. As an alternative, the addition of plants can greatly improve bioremediation rates and outcomes as plants provide microbial habitats, improve soil porosity (thereby increasing mass transfer of substrates and electron acceptors), and exchange limiting nutrients with their microbial counterparts. In return, plant-associated microorganisms improve plant growth by reducing soil toxicity through contaminant removal, producing plant growth promoting metabolites, liberating sequestered plant nutrients from soil, fixing nitrogen, and more generally establishing the foundations of soil nutrient cycling. In a practical and applied sense, the collective action of plants and their associated microorganisms is advantageous for remediation of PHC contaminated soil in terms of overall cost and success rates for in situ implementation in a diversity of environments. Mechanistically, there remain biological unknowns that present challenges for applying bio- and phyto-remediation technologies without having a deep prior understanding of individual target sites. In this review, evidence from traditional and modern omics technologies is discussed to provide a framework for plant microbe interactions during PHC remediation. The potential for integrating multiple molecular and computational techniques to evaluate linkages between microbial communities, plant communities and ecosystem processes is explored with an eye on improving phytoremediation of PHC contaminated sites.
Notes: [Gkorezis, Panagiotis; Sillen, Wouter; Vangronsveld, Jaco] Hasselt Univ, Ctr Environm Sci, Environm Biol, Diepenbeek, Belgium. [Daghio, Matte; Franzetti, Andrea] Univ Milano Bicocca, Dept Environm Sci, Milan, Italy. [Daghio, Matte; Van Hamme, Jonathan D.] Thompson Rivers Univ, Dept Biol Sci, Kamloops, BC, Canada.
URI: http://hdl.handle.net/1942/23229
DOI: 10.3389/fmicb.2016.01836
ISI #: 000388754000001
ISSN: 1664-302X
Category: A1
Type: Journal Contribution
Validation: ecoom, 2017
Appears in Collections: Research publications

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