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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
Oxic and Anoxic Organic Polymer Degradation Potential of Endophytic Fungi From the Marine Macroalga, Ecklonia radiata
Frontiers in Microbiology, Vol.12, pp.1-13
18/10/2021
PMCID: PMC8558676
PMID: 34733248
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Abstract
Cellulose and chitin are the most abundant polymeric, organic carbon source globally. Thus, microbes degrading these polymers significantly influence global carbon cycling and greenhouse gas production. Fungi are recognized as important for cellulose decomposition in terrestrial environments, but are far less studied in marine environments, where bacterial organic matter degradation pathways tend to receive more attention. In this study, we investigated the potential of fungi to degrade kelp detritus, which is a major source of cellulose in marine systems. Given that kelp detritus can be transported considerable distances in the marine environment, we were specifically interested in the capability of endophytic fungi, which are transported with detritus, to ultimately contribute to kelp detritus degradation. We isolated 10 species and two strains of endophytic fungi from the kelp Ecklonia radiata. We then used a dye decolorization assay to assess their ability to degrade organic polymers (lignin, cellulose, and hemicellulose) under both oxic and anoxic conditions and compared their degradation ability with common terrestrial fungi. Under oxic conditions, there was evidence that Ascomycota isolates produced cellulose-degrading extracellular enzymes (associated with manganese peroxidase and sulfur-containing lignin peroxidase), while Mucoromycota isolates appeared to produce both lignin and cellulose-degrading extracellular enzymes, and all Basidiomycota isolates produced lignin-degrading enzymes (associated with laccase and lignin peroxidase). Under anoxic conditions, only three kelp endophytes degraded cellulose. We concluded that kelp fungal endophytes can contribute to cellulose degradation in both oxic and anoxic environments. Thus, endophytic kelp fungi may play a significant role in marine carbon cycling via polymeric organic matter degradation.
Details
- Title
- Oxic and Anoxic Organic Polymer Degradation Potential of Endophytic Fungi From the Marine Macroalga, Ecklonia radiata
- Creators
- Anita K Perkins - Southern Cross UniversityAndrew L Rose - Southern Cross UniversityHans-Peter Grossart - Leibniz Institute of Freshwater Ecology and Inland FisheriesKeilor Rojas-Jimenez - Universidad de Costa RicaSelva K Barroso Prescott - Southern Cross UniversityJoanne M Oakes - Southern Cross University
- Publication Details
- Frontiers in Microbiology, Vol.12, pp.1-13
- Publisher
- Frontiers Research Foundation
- Grant note
- We acknowledge the support of the Deutsche Forschungsgemeinschaft and Open Access Publishing Fund of University of Potsdam.
- Identifiers
- 991012978063102368
- Copyright
- Copyright © 2021 Perkins, Rose, Grossart, Rojas-Jimenez, Barroso Prescott and Oakes. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
- Academic Unit
- Office of the Vice Chancellor; Faculty of Science and Engineering; School of Environment, Science and Engineering; Engineering; National Marine Science Centre; Southern Cross GeoScience; Centre for Coastal Biogeochemistry; Science
- Language
- English
- Resource Type
- Journal article