Biodegradation of dissolved humic substances by fungi

Collado, Sergio; Oulego, Paula; Suárez-Iglesias, Octavio; Dı́az, Mario

doi:10.1007/s00253-018-8851-6

Cited by 40 publications

(17 citation statements)

References 78 publications

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“…Inland waters, through the activity of aquatic bacteria and fungi, are involved in remineralizing large proportions of terrestrial organic matter into greenhouse gases. In this context, understanding the relative contribution of bacteria and fungi, of which fungi are better equipped to break down both dissolved and particulate polymeric organic matter, is critical (Grinhut et al 2011;Zahmatkesh et al 2016;Collado et al 2018). However, although aquatic Saprolegniales are generally isolated from floated plant and animal debris, their involvement in organic matter degradation in various freshwater ecosystems has been largely ignored.…”

Section: Discussionmentioning

confidence: 99%

Taxonomical and functional diversity of Saprolegniales in Anzali lagoon, Iran

Masigol

Khodaparast

Mostowfizadeh‐Ghalamfarsa

et al. 2020

Aquat Ecol

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Studies on the diversity, distribution and ecological role of Saprolegniales (Oomycota) in freshwater ecosystems are currently receiving attention due to a greater understanding of their role in carbon cycling in various aquatic ecosystems. In this study, we characterized several Saprolegniales species isolated from Anzali lagoon, Gilan province, Iran, using morphological and molecular methods. Four species of Saprolegnia were identified, including S. anisospora and S. diclina as first reports for Iran, as well as Achlya strains, which were closely related to A. bisexualis, A. debaryana and A. intricata. Evaluation of the ligno-, cellulo-and chitinolytic activities was performed using plate assay methods. Most of the Saprolegniales isolates were obtained in autumn, and nearly 50% of the strains showed chitinolytic and cellulolytic activities. However, only a few Saprolegniales strains showed lignolytic activities. This study has important implications for better understanding the ecological niche of oomycetes, and to differentiate them from morphologically similar, but functionally different aquatic fungi in freshwater ecosystems.Aquat Ecol (2020) 54:323-336 https://doi.org/10.1007/s10452-019-09745-w( 0123456789().,-volV) (0123456789().,-volV)

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Section: Discussionmentioning

confidence: 99%

Taxonomical and functional diversity of Saprolegniales in Anzali lagoon, Iran

Masigol

Khodaparast

Mostowfizadeh‐Ghalamfarsa

et al. 2020

Aquat Ecol

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“…Dikaryan fungi (Ascomycota and Basidiomycota) also attach to and degrade POM [13][14][15][16][17][18]. Given that POM-degrading fungi also use extracellular degradation mechanisms [19,20], it is likely that they produce 'public goods' for the wider community to exploit.…”

Section: Introductionmentioning

confidence: 99%

Chytrid fungi shape bacterial communities on model particulate organic matter

et al. 2020

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Microbial colonization and degradation of particulate organic matter (POM) are important processes that influence the structure and function of aquatic ecosystems. Although POM is readily used by aquatic fungi and bacteria, there is a limited understanding of POM-associated interactions between these taxa, particularly for early-diverging fungal lineages. Using a model ecological system with the chitin-degrading freshwater chytrid fungus Rhizoclosmatium globosum and chitin microbeads, we assessed the impacts of chytrid fungi on POM-associated bacteria. We show that the presence of chytrids on POM alters concomitant bacterial community diversity and structure, including differing responses between chytrid life stages. We propose that chytrids can act as ecosystem facilitators through saprotrophic feeding by producing ‘public goods’ from POM degradation that modify bacterial POM communities. This study suggests that chytrid fungi have complex ecological roles in aquatic POM degradation not previously considered, including the regulation of bacterial colonization, community succession and subsequent biogeochemical potential.

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“…Unlike bacteria, which exhibit a limited ability to degrade stable macromolecules (Filip and Tesarova 2004), fungal degradation and transformation of HS extracted from soil, coal, compost, groundwater, and freshwater ecosystems is widely accepted (Claus and Filip 1998;Belcarz et al 2005;Grinhut et al 2011;Zahmatkesh et al 2016;Collado et al 2018). In soil, this capacity is mainly affiliated with white-rot fungi, which represent a physiological group of fungi consisting of a broad and diverse range of species mainly distributed in the family of basidiomycetes and to lesser extent ascomycetes (Eaton and Hale 1993;Grinhut et al 2011;Collado et al 2018). A large variety of lignocellulolytic enzymes such as peroxidases, laccases, endoglucanases (endo-1,4-b-glucanases), cellobiohydrolases (exo-1,4-b-glucanases), xylanases, and pectinases of fungi have been confirmed to play a vital role in microbial HS transformation (Kirk and Cullen 1998;Pointing 1999;Pérez et al 2002;Maciel and Ribeiro 2010).…”

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confidence: 99%

The contrasting roles of aquatic fungi and oomycetes in the degradation and transformation of polymeric organic matter

Masigol

Khodaparast

Woodhouse

et al. 2019

Limnology & Oceanography

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Studies on the ecological role of fungi and, to a lesser extent, oomycetes, are receiving increasing attention, mainly due to their participation in the cycling of organic matter in aquatic ecosystems. To unravel their importance in humification processes, we isolated several strains of fungi and oomycetes from Anzali lagoon, Iran. We then performed taxonomic characterization by morphological and molecular methods, analyzed the ability to degrade several polymeric substrates, performed metabolic fingerprinting with Ecoplates, and determined the degradation of humic substances (HS) using liquid chromatography‐organic carbon detection. Our analyses highlighted the capacity of aquatic fungi to better degrade a plethora of organic molecules, including complex polymers. Specifically, we were able to demonstrate not only the utilization of these complex polymers, but also the role of fungi in the production of HS. In contrast, oomycetes, despite some morphological and physiological similarities with aquatic fungi, exhibited a propensity toward opportunism, quickly benefitting from the availability of small organic molecules, while exhibiting sensitivity toward more complex polymers. Despite their contrasting roles, our study highlights the importance of both oomycetes and fungi in aquatic organic matter transformation and cycling with potential implications for the global carbon cycle.

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Biodegradation of dissolved humic substances by fungi

Cited by 40 publications

References 78 publications

Taxonomical and functional diversity of Saprolegniales in Anzali lagoon, Iran

Taxonomical and functional diversity of Saprolegniales in Anzali lagoon, Iran

Chytrid fungi shape bacterial communities on model particulate organic matter

The contrasting roles of aquatic fungi and oomycetes in the degradation and transformation of polymeric organic matter

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