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Schreiber J, Baldrian P, Brabcová V, Brandl R, Kellner H, Müller J, Roy F, Bässler C, Krah FS. Effects of experimental canopy openness on wood-inhabiting fungal fruiting diversity across succession. Sci Rep 2024; 14:16135. [PMID: 38997416 PMCID: PMC11245472 DOI: 10.1038/s41598-024-67216-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Accepted: 07/09/2024] [Indexed: 07/14/2024] Open
Abstract
While the succession of terrestrial plant communities is well studied, less is known about succession on dead wood, especially how it is affected by environmental factors. While temperate forests face increasing canopy mortality, which causes considerable changes in microclimates, it remains unclear how canopy openness affects fungal succession. Here, we used a large real-world experiment to study the effect of closed and opened canopy on treatment-based alpha and beta fungal fruiting diversity. We found increasing diversity in early and decreasing diversity at later stages of succession under both canopies, with a stronger decrease under open canopies. However, the slopes of the diversity versus time relationships did not differ significantly between canopy treatments. The community dissimilarity remained mainly stable between canopies at ca. 25% of species exclusively associated with either canopy treatment. Species exclusive in either canopy treatment showed very low number of occupied objects compared to species occurring in both treatments. Our study showed that canopy loss subtly affected fungal fruiting succession on dead wood, suggesting that most species in the local species pool are specialized or can tolerate variable conditions. Our study indicates that the fruiting of the fungal community on dead wood is resilient against the predicted increase in canopy loss in temperate forests.
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Affiliation(s)
- Jasper Schreiber
- Faculty of Biological Sciences, Institute for Ecology, Evolution and Diversity, Conservation Biology, Goethe University Frankfurt, 60438, Frankfurt am Main, Germany
| | - Petr Baldrian
- Laboratory of Environmental Microbiology, Institute of Microbiology of the Czech Academy of Sciences, 14200, Prague, Czech Republic
| | - Vendula Brabcová
- Laboratory of Environmental Microbiology, Institute of Microbiology of the Czech Academy of Sciences, 14200, Prague, Czech Republic
| | - Roland Brandl
- Faculty of Biology, Department of Ecology, Animal Ecology, Philips University of Marburg, 35032, Marburg, Germany
| | - Harald Kellner
- International Institute Zittau, Department of Bio- and Environmental Sciences, Technical University Dresden, 02763, Zittau, Germany
| | - Jörg Müller
- Field Station Fabrikschleichach, Department of Animal Ecology and Tropical Biology Biocenter, University of Würzburg, 96181, Rauhenebrach, Germany
- Bavarian Forest National Park, Grafenau, Germany
| | - Friederike Roy
- International Institute Zittau, Department of Bio- and Environmental Sciences, Technical University Dresden, 02763, Zittau, Germany
| | - Claus Bässler
- Faculty of Biological Sciences, Institute for Ecology, Evolution and Diversity, Conservation Biology, Goethe University Frankfurt, 60438, Frankfurt am Main, Germany
- Fungal Ecology and BayCEER, University of Bayreuth, Universitätsstr. 30, 95440, Bayreuth, Germany
- Bavarian Forest National Park, Grafenau, Germany
| | - Franz-Sebastian Krah
- Fungal Ecology and BayCEER, University of Bayreuth, Universitätsstr. 30, 95440, Bayreuth, Germany.
- Global Change Research Institute of the Czech Academy of Sciences, 603 00, Brno, Czech Republic.
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Substrate affinities of wood decay fungi are foremost structured by wood properties not climate. FUNGAL ECOL 2023. [DOI: 10.1016/j.funeco.2023.101231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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3
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Vivelo S, Alsairafi B, Walsh JT, Bhatnagar JM. Intrinsic growth rate and cellobiohydrolase activity underlie the phylogenetic signal to fungal decomposer succession. FUNGAL ECOL 2023. [DOI: 10.1016/j.funeco.2022.101180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Valette N, Legout A, Goodell B, Alfredsen G, Auer L, Gelhaye E, Derrien D. Impact of Norway spruce pre-degradation stages induced by Gloeophyllum trabeum on fungal and bacterial communities. FUNGAL ECOL 2023. [DOI: 10.1016/j.funeco.2022.101188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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O'Leary J, Journeaux KL, Houthuijs K, Engel J, Sommer U, Viant MR, Eastwood DC, Müller C, Boddy L. Space and patchiness affects diversity-function relationships in fungal decay communities. THE ISME JOURNAL 2021; 15:720-731. [PMID: 33067587 PMCID: PMC8027639 DOI: 10.1038/s41396-020-00808-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 10/01/2020] [Accepted: 10/05/2020] [Indexed: 01/30/2023]
Abstract
The space in which organisms live determines health and physicality, shaping the way in which they interact with their peers. Space, therefore, is critically important for species diversity and the function performed by individuals within mixed communities. The biotic and abiotic factors defined by the space that organisms occupy are ecologically significant and the difficulty in quantifying space-defined parameters within complex systems limits the study of ecological processes. Here, we overcome this problem using a tractable system whereby spatial heterogeneity in interacting fungal wood decay communities demonstrates that scale and patchiness of territory directly influence coexistence dynamics. Spatial arrangement in 2- and 3-dimensions resulted in measurable metabolic differences that provide evidence of a clear biological response to changing landscape architecture. This is of vital importance to microbial systems in all ecosystems globally, as our results demonstrate that community function is driven by the effects of spatial dynamics.
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Affiliation(s)
- Jade O'Leary
- Cardiff School of Biosciences, Cardiff University, Cardiff, CF10 3AX, UK
| | - Katie L Journeaux
- Cardiff School of Biosciences, Cardiff University, Cardiff, CF10 3AX, UK
| | - Kas Houthuijs
- Institute for Molecules and Materials, Radboud University, 6525 AJ, Nijmegen, The Netherlands
| | - Jasper Engel
- NERC Biomolecular Analysis Facility-Metabolomics Node (NBAF-B), School of Biosciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Ulf Sommer
- NERC Biomolecular Analysis Facility-Metabolomics Node (NBAF-B), School of Biosciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Mark R Viant
- NERC Biomolecular Analysis Facility-Metabolomics Node (NBAF-B), School of Biosciences, University of Birmingham, Birmingham, B15 2TT, UK
| | | | - Carsten Müller
- Cardiff School of Biosciences, Cardiff University, Cardiff, CF10 3AX, UK
| | - Lynne Boddy
- Cardiff School of Biosciences, Cardiff University, Cardiff, CF10 3AX, UK.
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Wesener F, Szymczak A, Rillig MC, Tietjen B. Stress priming affects fungal competition - evidence from a combined experimental and modelling study. Environ Microbiol 2021; 23:5934-5945. [PMID: 33538387 DOI: 10.1111/1462-2920.15418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 01/18/2021] [Accepted: 01/29/2021] [Indexed: 12/01/2022]
Abstract
Priming, an inducible stress defence strategy that prepares an organism for an impending stress event, is common in microbes and has been studied mostly in isolated organisms or populations. How the benefits of priming change in the microbial community context and, vice versa, whether priming influences competition between organisms, remain largely unknown. In this study, we grew different isolates of soil fungi that experienced heat stress in isolation and pairwise competition experiments and assessed colony extension rate as a measure of fitness under priming and non-priming conditions. Based on this data, we developed a cellular automaton model simulating the growth of the ascomycete Chaetomium angustispirale competing against other fungi and systematically varied fungal response traits to explain similarities and differences observed in the experimental data. We showed that competition changes the priming benefit compared with isolated growth and that it can even be reversed depending on the competitor's traits such as growth rate, primeability and stress susceptibility. With this study, we transfer insights on priming from studies in isolation to competition between species. This is an important step towards understanding the role of inducible defences in microbial community assembly and composition.
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Affiliation(s)
- Felix Wesener
- Institute of Biology, Theoretical Ecology, Freie Universität Berlin, Königin-Luise-Str. 2/4, Gartenhaus, Berlin, 14195, Germany
| | - Aleksandra Szymczak
- Institute of Biology, Ecology of Plants, Freie Universität Berlin, Altensteinstraße 6, Berlin, 14195, Germany
| | - Matthias C Rillig
- Institute of Biology, Ecology of Plants, Freie Universität Berlin, Altensteinstraße 6, Berlin, 14195, Germany.,Berlin Brandenburg Institute of Advanced Biodiversity Research (BBIB), Berlin, 14195, Germany
| | - Britta Tietjen
- Institute of Biology, Theoretical Ecology, Freie Universität Berlin, Königin-Luise-Str. 2/4, Gartenhaus, Berlin, 14195, Germany.,Berlin Brandenburg Institute of Advanced Biodiversity Research (BBIB), Berlin, 14195, Germany
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Muszynski S, Maurer F, Henjes S, Horn MA, Noll M. Fungal and Bacterial Diversity Patterns of Two Diversity Levels Retrieved From a Late Decaying Fagus sylvatica Under Two Temperature Regimes. Front Microbiol 2021; 11:548793. [PMID: 33584553 PMCID: PMC7874115 DOI: 10.3389/fmicb.2020.548793] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 11/19/2020] [Indexed: 11/25/2022] Open
Abstract
Environmental fluctuations are a common occurrence in an ecosystem, which have an impact on organismic diversity and associated ecosystem services. The aim of this study was to investigate how a natural and a species richness-reduced wood decaying community diversity were capable of decomposing Fagus sylvatica dead wood under a constant and a fluctuating temperature regime. Therefore, microcosms with both diversity levels (natural and species richness-reduced) were prepared and incubated for 8 weeks under both temperature regimes. Relative wood mass loss, wood pH, carbon dioxide, and methane emissions, as well as fungal and bacterial community compositions in terms of Simpson‘s diversity, richness and evenness were investigated. Community interaction patterns and co-occurrence networks were calculated. Community composition was affected by temperature regime and natural diversity caused significantly higher mass loss than richness-reduced diversity. In contrast, richness-reduced diversity increased wood pH. The bacterial community composition was less affected by richness reduction and temperature regimes than the fungal community composition. Microbial interaction patterns showed more mutual exclusions in richness-reduced compared to natural diversity as the reduction mainly reduced abundant fungal species and disintegrated previous interaction patterns. Microbial communities reassembled in richness-reduced diversity with a focus on nitrate reducing and dinitrogen-fixing bacteria as connectors in the network, indicating their high relevance to reestablish ecosystem functions. Therefore, a stochastic richness reduction was followed by functional trait based reassembly to recover previous ecosystem productivity.
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Affiliation(s)
- Sarah Muszynski
- Department of Applied Science, Institute of Bioanalysis, University of Coburg, Coburg, Germany
| | - Florian Maurer
- Department of Applied Science, Institute of Bioanalysis, University of Coburg, Coburg, Germany
| | - Sina Henjes
- Institute of Microbiology, Leibniz University of Hannover, Hanover, Germany
| | - Marcus A Horn
- Institute of Microbiology, Leibniz University of Hannover, Hanover, Germany
| | - Matthias Noll
- Department of Applied Science, Institute of Bioanalysis, University of Coburg, Coburg, Germany
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Metabarcoding on both environmental DNA and RNA highlights differences between fungal communities sampled in different habitats. PLoS One 2020; 15:e0244682. [PMID: 33378355 PMCID: PMC7773206 DOI: 10.1371/journal.pone.0244682] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 12/14/2020] [Indexed: 12/14/2022] Open
Abstract
In recent years, metabarcoding has become a key tool to describe microbial communities from natural and artificial environments. Thanks to its high throughput nature, metabarcoding efficiently explores microbial biodiversity under different conditions. It can be performed on environmental (e)DNA to describe so-called total microbial community, or from environmental (e)RNA to describe active microbial community. As opposed to total microbial communities, active ones exclude dead or dormant organisms. For what concerns Fungi, which are mostly filamentous microorganisms, the relationship between DNA-based (total) and RNA-based (active) communities is unclear. In the present study, we evaluated the consequences of performing metabarcoding on both soil and wood-extracted eDNA and eRNA to delineate molecular operational taxonomic units (MOTUs) and differentiate fungal communities according to the environment they originate from. DNA and RNA-based communities differed not only in their taxonomic composition, but also in the relative abundances of several functional guilds. From a taxonomic perspective, we showed that several higher taxa are globally more represented in either “active” or “total” microbial communities. We also observed that delineation of MOTUs based on their co-occurrence among DNA and RNA sequences highlighted differences between the studied habitats that were overlooked when all MOTUs were considered, including those identified exclusively by eDNA sequences. We conclude that metabarcoding on eRNA provides original functional information on the specific roles of several taxonomic or functional groups that would not have been revealed using eDNA alone.
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10
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Long-term decomposition of litter in the montane forest and the definition of fungal traits in the successional space. FUNGAL ECOL 2020. [DOI: 10.1016/j.funeco.2020.100913] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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12
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Johnston SR, Hiscox J, Savoury M, Boddy L, Weightman AJ. Highly competitive fungi manipulate bacterial communities in decomposing beech wood (Fagus sylvatica). FEMS Microbiol Ecol 2019; 95:5218414. [PMID: 30496397 PMCID: PMC6301287 DOI: 10.1093/femsec/fiy225] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 11/08/2018] [Indexed: 12/22/2022] Open
Abstract
The bacterial communities in decomposing wood are receiving increased attention, but their interactions with wood-decay fungi are poorly understood. This is the first field study to test the hypothesis that fungi are responsible for driving bacterial communities in beech wood (Fagus sylvatica). A meta-genetic approach was used to characterise bacterial and fungal communities in wood that had been laboratory-colonised with known wood-decay fungi, and left for a year at six woodland sites. Alpha-, Beta- and Gammaproteobacteria and Acidobacteria were the proportionally dominant bacterial taxa, as in previous studies. Pre-colonising wood with decay fungi had a clear effect on the bacterial community, apparently via direct fungal influence; the bacterial and fungal communities present at the time of collection explained nearly 60% of their mutual covariance. Site was less important than fungal influence in determining bacterial communities, but the effects of pre-colonisation were more pronounced at some sites than at others. Wood pH was also a strong bacterial predictor, but was itself under considerable fungal influence. Burkholderiaceae and Acidobacteriaceae showed directional responses against the trend of the bacterial community as a whole.
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Affiliation(s)
- Sarah R Johnston
- Cardiff School of Biosciences, Cardiff University, Museum Avenue, Cardiff. CF10 3AX. Wales, UK
| | - Jennifer Hiscox
- Cardiff School of Biosciences, Cardiff University, Museum Avenue, Cardiff. CF10 3AX. Wales, UK
| | - Melanie Savoury
- Cardiff School of Biosciences, Cardiff University, Museum Avenue, Cardiff. CF10 3AX. Wales, UK
| | - Lynne Boddy
- Cardiff School of Biosciences, Cardiff University, Museum Avenue, Cardiff. CF10 3AX. Wales, UK
| | - Andrew J Weightman
- Cardiff School of Biosciences, Cardiff University, Museum Avenue, Cardiff. CF10 3AX. Wales, UK
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Christofides SR, Hiscox J, Savoury M, Boddy L, Weightman AJ. Fungal control of early-stage bacterial community development in decomposing wood. FUNGAL ECOL 2019. [DOI: 10.1016/j.funeco.2019.100868] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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15
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Maynard DS, Covey KR, Crowther TW, Sokol NW, Morrison EW, Frey SD, van Diepen LTA, Bradford MA. Species associations overwhelm abiotic conditions to dictate the structure and function of wood‐decay fungal communities. Ecology 2018; 99:801-811. [DOI: 10.1002/ecy.2165] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Revised: 12/02/2017] [Accepted: 01/08/2018] [Indexed: 01/27/2023]
Affiliation(s)
- Daniel S. Maynard
- Department of Ecology and Evolution University of Chicago 1101 E 57th Street Chicago Illinois 60637 USA
- School of Forestry and Environmental Studies Yale University 370 Prospect Street New Haven Connecticut 06511 USA
| | - Kristofer R. Covey
- School of Forestry and Environmental Studies Yale University 370 Prospect Street New Haven Connecticut 06511 USA
| | - Thomas W. Crowther
- Institute of Integrative Biology ETH Zurich Univeritätstrasse 16 8006 Zurich Switzerland
| | - Noah W. Sokol
- School of Forestry and Environmental Studies Yale University 370 Prospect Street New Haven Connecticut 06511 USA
| | - Eric W. Morrison
- Department of Natural Resources and the Environment University of New Hampshire Durham New Hampshire 03824 USA
| | - Serita D. Frey
- Department of Natural Resources and the Environment University of New Hampshire Durham New Hampshire 03824 USA
| | - Linda T. A. van Diepen
- Department of Ecosystem Science and Management University of Wyoming 1000 East University Avenue Laramie Wyoming 82071 USA
| | - Mark A. Bradford
- School of Forestry and Environmental Studies Yale University 370 Prospect Street New Haven Connecticut 06511 USA
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Miura T, Sánchez R, Castañeda LE, Godoy K, Barbosa O. Is microbial terroir related to geographic distance between vineyards? ENVIRONMENTAL MICROBIOLOGY REPORTS 2017; 9:742-749. [PMID: 28892290 DOI: 10.1111/1758-2229.12589] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 08/28/2017] [Indexed: 05/20/2023]
Abstract
While there are substantial studies suggesting that characteristics of wine are related to regional microbial community composition (microbial terroir), there has been little discussion about what factors affect variation in regional microbial community composition. In this study, we compared the microbial community composition of leaves and berries of a grape variety (Carmenere) from six different Chilean vineyards within 35 km of each other. In order to determine relationships between spatial proximity and microbial compositional dissimilarity, we sequenced amplicons of the internal transcribed spacer (ITS) region for fungi and 16S rRNA gene for bacteria. Results showed that both the fungal and the bacterial community compositions of the studied vineyards differed, but this difference was much clearer in fungi than in bacteria. In addition, while bacterial community dissimilarity was not correlated with geographic distance, the leaf and berry fungal community dissimilarities between locations increased with geographic distance. This indicates that spatial processes play an important role in structuring the biogeographic pattern of grape-associated fungal communities at local scales, which might in turn contribute to the local identity of wine.
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Affiliation(s)
- Toshiko Miura
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
- Instituto de Ecología & Biodiversidad (IEB-Chile), Casilla 653, Santiago, Chile
| | - Roland Sánchez
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
- Instituto de Ecología & Biodiversidad (IEB-Chile), Casilla 653, Santiago, Chile
| | - Luis E Castañeda
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
- Millennium Nucleus Center in Molecular Ecology and Evolutionary Applications in the Agroecosystems, Universidad de Talca, Talca, Chile
| | - Karina Godoy
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
- Instituto de Ecología & Biodiversidad (IEB-Chile), Casilla 653, Santiago, Chile
| | - Olga Barbosa
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
- Instituto de Ecología & Biodiversidad (IEB-Chile), Casilla 653, Santiago, Chile
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Mali T, Kuuskeri J, Shah F, Lundell TK. Interactions affect hyphal growth and enzyme profiles in combinations of coniferous wood-decaying fungi of Agaricomycetes. PLoS One 2017; 12:e0185171. [PMID: 28953947 PMCID: PMC5617175 DOI: 10.1371/journal.pone.0185171] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 09/07/2017] [Indexed: 12/21/2022] Open
Abstract
Fomitopsis pinicola is a species of Polyporales frequently encountered in Nordic temperate and boreal forests. In nature, the fungus causes destructive brown rot in wood, colonizing tree trunks often occupied by other Basidiomycota species. We mimicked these species-species interactions by introducing F. pinicola to five white rot species, all common saprotrophs of Norway spruce. Hyphal interactions and mycelial growth in various combinations were recorded, while activities of lignocellulose-acting CAZymes and oxidoreductases were followed in co-cultures on two different carbon-source media. Of the species, Phlebia radiata and Trichaptum abietinum were the strongest producers of lignin-modifying oxidoreductases (laccase, manganese peroxidase) when evaluated alone, as well as in co-cultures, on the two different growth media (low-nitrogen liquid medium containing ground coniferous wood, and malt extract broth). F. pinicola was an outstanding producer of oxalic acid (up to 61 mM), whereas presence of P. radiata prevented acidification of the growth environment in the liquid malt-extract cultures. When enzyme profiles of the species combinations were clustered, time-dependent changes were observed on wood-supplemented medium during the eight weeks of growth. End-point acidity and production of mycelium, oxalic acid and oxidoreductase activities, in turn clustered the fungal combinations into three distinct functional groups, determined by the presence of F. pinicola and P. radiata, by principal component analysis. Our findings indicate that combinations of wood-decay fungi have dramatic dynamic effects on the production of lignocellulose-active enzymes, which may lead to divergent degradative processes of dead wood and forest litter.
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Affiliation(s)
- Tuulia Mali
- Microbiology and Biotechnology, Department of Food and Environmental Sciences, Viikki Campus, University of Helsinki, Helsinki, Finland
| | - Jaana Kuuskeri
- Microbiology and Biotechnology, Department of Food and Environmental Sciences, Viikki Campus, University of Helsinki, Helsinki, Finland
| | - Firoz Shah
- Microbiology and Biotechnology, Department of Food and Environmental Sciences, Viikki Campus, University of Helsinki, Helsinki, Finland
| | - Taina Kristina Lundell
- Microbiology and Biotechnology, Department of Food and Environmental Sciences, Viikki Campus, University of Helsinki, Helsinki, Finland
- * E-mail:
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Abstract
Decomposer fungi continually deplete the organic resources they inhabit, so successful colonization of new resources is a crucial part of their ecology. Colonization success can be split into (i) the ability to arrive at, gain entry into, and establish within a resource and (ii) the ability to persist within the resource until reproduction and dissemination. Fungi vary in their life history strategies, the three main drivers of which are stress (S-selected), disturbance (ruderal, or R-selected), and incidence of competitors (C-selected); however, fungi often have combinations of characteristics from different strategies. Arrival at a new resource may occur as spores or mycelium, with successful entry and establishment (primary resource capture) within the resource largely dependent on the enzymatic ability of the fungus. The communities that develop in a newly available resource depend on environmental conditions and, in particular, the levels of abiotic stress present (e.g., high temperature, low water availability). Community change occurs when these initial colonizers are replaced by species that are either more combative (secondary resource capture) or better able to tolerate conditions within the resource, either through changing abiotic conditions or due to modification of the resource by the initial colonizers. Competition for territory may involve highly specialized species-specific interactions such as mycoparasitism or may be more general; in both cases combat involves changes in morphology, metabolism, and reactive oxygen species production, and outcomes of these interactions can be altered under different environmental conditions. In summary, community development is not a simple ordered sequence, but a complex ever-changing mosaic.
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Goodell B, Zhu Y, Kim S, Kafle K, Eastwood D, Daniel G, Jellison J, Yoshida M, Groom L, Pingali SV, O’Neill H. Modification of the nanostructure of lignocellulose cell walls via a non-enzymatic lignocellulose deconstruction system in brown rot wood-decay fungi. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:179. [PMID: 28702084 PMCID: PMC5504834 DOI: 10.1186/s13068-017-0865-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 06/30/2017] [Indexed: 06/01/2023]
Abstract
Wood decayed by brown rot fungi and wood treated with the chelator-mediated Fenton (CMF) reaction, either alone or together with a cellulose enzyme cocktail, was analyzed by small angle neutron scattering (SANS), sum frequency generation (SFG) spectroscopy, Fourier transform infrared (FTIR) analysis, X-ray diffraction (XRD), atomic force microscopy (AFM), and transmission electron microscopy (TEM). Results showed that the CMF mechanism mimicked brown rot fungal attack for both holocellulose and lignin components of the wood. Crystalline cellulose and lignin were both depolymerized by the CMF reaction. Porosity of the softwood cell wall did not increase during CMF treatment, enzymes secreted by the fungi did not penetrate the decayed wood. The enzymes in the cellulose cocktail also did not appear to alter the effects of the CMF-treated wood relative to enhancing cell wall deconstruction. This suggests a rethinking of current brown rot decay models and supports a model where monomeric sugars and oligosaccharides diffuse from the softwood cell walls during non-enzymatic action. In this regard, the CMF mechanism should not be thought of as a "pretreatment" used to permit enzymatic penetration into softwood cell walls, but instead it enhances polysaccharide components diffusing to fungal enzymes located in wood cell lumen environments during decay. SANS and other data are consistent with a model for repolymerization and aggregation of at least some portion of the lignin within the cell wall, and this is supported by AFM and TEM data. The data suggest that new approaches for conversion of wood substrates to platform chemicals in biorefineries could be achieved using the CMF mechanism with >75% solubilization of lignocellulose, but that a more selective suite of enzymes and other downstream treatments may be required to work when using CMF deconstruction technology. Strategies to enhance polysaccharide release from lignocellulose substrates for enhanced enzymatic action and fermentation of the released fraction would also aid in the efficient recovery of the more uniform modified lignin fraction that the CMF reaction generates to enhance biorefinery profitability.
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Affiliation(s)
- Barry Goodell
- Department of Microbiology, Morrill Science Center IV, University of Massachusetts, Amherst, MA 01003-9298 USA
| | - Yuan Zhu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Seong Kim
- Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA USA
| | - Kabindra Kafle
- Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA USA
| | - Daniel Eastwood
- Department of Biosciences, Swansea University, Singleton Park Campus, Swansea, UK
| | - Geoffrey Daniel
- Department of Forest Products/Wood Science, Swedish University of Agricultural Science, Uppsala, Sweden
| | - Jody Jellison
- Center for Agriculture, Food and the Environment, University of Massachusetts, 316 Stockbridge Hall, Amherst, USA
| | - Makoto Yoshida
- Department of Environmental and Natural Resource Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan
| | - Leslie Groom
- USDA Forest Service, Southern Research Station, Pineville, Louisiana 71360 USA
| | - Sai Venkatesh Pingali
- Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
| | - Hugh O’Neill
- Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
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