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Title: Nanoscale Observations of Extracellular Polymeric Substances Deposition on Phyllosilicates by an Ectomycorrhizal Fungus
Authors: Gazze, Salvatore A.
Saccone, Loredana
Smits, Mark M. 
Duran, Adele L.
Leake, Jonathan R.
Banwart, Steven A.
Ragnarsdottir, K. Vala
McMaster, Terence J.
Issue Date: 2013
Source: GEOMICROBIOLOGY JOURNAL, 30 (8), p. 721-730
Abstract: Microorganisms colonizing surfaces can exude a wide range of substances, generally called Extracellular Polymeric Substances (EPS). While EPS has often been visualized as thick mature strata embedding microbes, the initial phases of EPS production, its structure at the micro- and nanoscale and the microbial wall areas involved in its exudation are less known. In this work we use Atomic Force Microscopy to image EPS produced by the fungus Paxillus involutus on phyllosilicate surfaces. Hyphal tips initially deposit EPS which assumes the shape of a halo surrounding hyphae. The fusion of adjacent EPS halos is likely responsible for the creation of EPS monolayers covering mineral surfaces. It is also proposed that a specific region of hyphae initiates the formation of mineral channels produced by fungi. The results presented here permit for the first time to propose a model for the initial stages of EPS accumulation in fungi and filamentous microorganisms in general.
Notes: Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England. Hasselt Univ, Diepenbeek, Belgium. Univ Sheffield, Dept Anim & Plant Sci, Western Bank, Sheffield S10 2TN, S Yorkshire, England. Univ Sheffield, Dept Civil & Struct Engn, Kroto Res Inst, Sheffield, S Yorkshire, England. Univ Iceland, Inst Earth Sci, Sch Engn & Nat Sci, Reykjavik, Iceland.
Keywords: atomic force microscopy (AFM); ectomycorrhizal fungi; extracellular polymeric substances (EPS); tip exudation;Environmental Sciences; Geosciences, Multidisciplinary
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ISSN: 0149-0451
e-ISSN: 1521-0529
DOI: 10.1080/01490451.2013.766285
ISI #: 000320911900006
Category: A1
Type: Journal Contribution
Validations: ecoom 2014
Appears in Collections:Research publications

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