Links Between Heathland Fungal Biomass Mineralization, Melanization, and Hydrophobicity

Mathias Lenaers, Wouter Reyns, Jan Czech, Robert Carleer, Indranil Basak, Wim Deferme, Patrycja Krupinska, Talha Yildiz, Sherilyn Saro, Tony Remans, Jaco Vangronsveld, Frédérik De Laender, Francois Rineau

Research output: Contribution to journalArticle

Abstract

Comprehending the decomposition process is crucial for our understanding of the mechanisms of carbon (C) sequestration in soils. The decomposition of plant biomass has been extensively studied. It revealed that extrinsic biomass properties that restrict its access to decomposers influence decomposition more than intrinsic ones that are only related to its chemical structure. Fungal biomass has been much less investigated, even though it contributes to a large extent to soil organic matter, and is characterized by specific biochemical properties. In this study, we investigated the extent to which decomposition of heathland fungal biomass was affected by its hydrophobicity (extrinsic property) and melanin content (intrinsic property). We hypothesized that, as for plant biomass, hydrophobicity would have a greater impact on decomposition than melanin content. Mineralization was determined as the mineralization of soil organic carbon (SOC) into CO2 by headspace GC/MS after inoculation by a heathland soil microbial community. Results show that decomposition was not affected by hydrophobicity, but was negatively correlated with melanin content. We argue that it may indicate that either melanin content is both an intrinsic and extrinsic property, or that some soil decomposers evolved the ability to use surfactants to access to hydrophobic biomass. In the latter case, biomass hydrophobicity should not be considered as a crucial extrinsic factor. We also explored the ecology of decomposition, melanin content, and hydrophobicity, among heathland soil fungal guilds. Ascomycete black yeasts had the highest melanin content, and hyaline Basidiomycete yeasts the lowest. Hydrophobicity was an all-or-nothing trait, with most isolates being hydrophobic.
LanguageEnglish
Number of pages9
JournalMicrobial Ecology
Publication statusAccepted/In press - 2018

Fingerprint

heathland
melanin
hydrophobicity
decomposition
mineralization
biomass
soil
yeast
guild
carbon sequestration
inoculation
surfactant
soil organic matter
microbial community
organic carbon
ecology
carbon

Keywords

  • decomposition
  • fungal biomass
  • heathland
  • hydrophobicity
  • melanin

Cite this

Lenaers, M., Reyns, W., Czech, J., Carleer, R., Basak, I., Deferme, W., ... Rineau, F. (Accepted/In press). Links Between Heathland Fungal Biomass Mineralization, Melanization, and Hydrophobicity. Microbial Ecology.
Lenaers, Mathias ; Reyns, Wouter ; Czech, Jan ; Carleer, Robert ; Basak, Indranil ; Deferme, Wim ; Krupinska, Patrycja ; Yildiz, Talha ; Saro, Sherilyn ; Remans, Tony ; Vangronsveld, Jaco ; De Laender, Frédérik ; Rineau, Francois. / Links Between Heathland Fungal Biomass Mineralization, Melanization, and Hydrophobicity. In: Microbial Ecology. 2018.
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abstract = "Comprehending the decomposition process is crucial for our understanding of the mechanisms of carbon (C) sequestration in soils. The decomposition of plant biomass has been extensively studied. It revealed that extrinsic biomass properties that restrict its access to decomposers influence decomposition more than intrinsic ones that are only related to its chemical structure. Fungal biomass has been much less investigated, even though it contributes to a large extent to soil organic matter, and is characterized by specific biochemical properties. In this study, we investigated the extent to which decomposition of heathland fungal biomass was affected by its hydrophobicity (extrinsic property) and melanin content (intrinsic property). We hypothesized that, as for plant biomass, hydrophobicity would have a greater impact on decomposition than melanin content. Mineralization was determined as the mineralization of soil organic carbon (SOC) into CO2 by headspace GC/MS after inoculation by a heathland soil microbial community. Results show that decomposition was not affected by hydrophobicity, but was negatively correlated with melanin content. We argue that it may indicate that either melanin content is both an intrinsic and extrinsic property, or that some soil decomposers evolved the ability to use surfactants to access to hydrophobic biomass. In the latter case, biomass hydrophobicity should not be considered as a crucial extrinsic factor. We also explored the ecology of decomposition, melanin content, and hydrophobicity, among heathland soil fungal guilds. Ascomycete black yeasts had the highest melanin content, and hyaline Basidiomycete yeasts the lowest. Hydrophobicity was an all-or-nothing trait, with most isolates being hydrophobic.",
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Lenaers, M, Reyns, W, Czech, J, Carleer, R, Basak, I, Deferme, W, Krupinska, P, Yildiz, T, Saro, S, Remans, T, Vangronsveld, J, De Laender, F & Rineau, F 2018, 'Links Between Heathland Fungal Biomass Mineralization, Melanization, and Hydrophobicity' Microbial Ecology.

Links Between Heathland Fungal Biomass Mineralization, Melanization, and Hydrophobicity. / Lenaers, Mathias; Reyns, Wouter; Czech, Jan ; Carleer, Robert; Basak, Indranil; Deferme, Wim; Krupinska, Patrycja; Yildiz, Talha; Saro, Sherilyn; Remans, Tony; Vangronsveld, Jaco; De Laender, Frédérik; Rineau, Francois.

In: Microbial Ecology, 2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Links Between Heathland Fungal Biomass Mineralization, Melanization, and Hydrophobicity

AU - Lenaers, Mathias

AU - Reyns, Wouter

AU - Czech, Jan

AU - Carleer, Robert

AU - Basak, Indranil

AU - Deferme, Wim

AU - Krupinska, Patrycja

AU - Yildiz, Talha

AU - Saro, Sherilyn

AU - Remans, Tony

AU - Vangronsveld, Jaco

AU - De Laender, Frédérik

AU - Rineau, Francois

PY - 2018

Y1 - 2018

N2 - Comprehending the decomposition process is crucial for our understanding of the mechanisms of carbon (C) sequestration in soils. The decomposition of plant biomass has been extensively studied. It revealed that extrinsic biomass properties that restrict its access to decomposers influence decomposition more than intrinsic ones that are only related to its chemical structure. Fungal biomass has been much less investigated, even though it contributes to a large extent to soil organic matter, and is characterized by specific biochemical properties. In this study, we investigated the extent to which decomposition of heathland fungal biomass was affected by its hydrophobicity (extrinsic property) and melanin content (intrinsic property). We hypothesized that, as for plant biomass, hydrophobicity would have a greater impact on decomposition than melanin content. Mineralization was determined as the mineralization of soil organic carbon (SOC) into CO2 by headspace GC/MS after inoculation by a heathland soil microbial community. Results show that decomposition was not affected by hydrophobicity, but was negatively correlated with melanin content. We argue that it may indicate that either melanin content is both an intrinsic and extrinsic property, or that some soil decomposers evolved the ability to use surfactants to access to hydrophobic biomass. In the latter case, biomass hydrophobicity should not be considered as a crucial extrinsic factor. We also explored the ecology of decomposition, melanin content, and hydrophobicity, among heathland soil fungal guilds. Ascomycete black yeasts had the highest melanin content, and hyaline Basidiomycete yeasts the lowest. Hydrophobicity was an all-or-nothing trait, with most isolates being hydrophobic.

AB - Comprehending the decomposition process is crucial for our understanding of the mechanisms of carbon (C) sequestration in soils. The decomposition of plant biomass has been extensively studied. It revealed that extrinsic biomass properties that restrict its access to decomposers influence decomposition more than intrinsic ones that are only related to its chemical structure. Fungal biomass has been much less investigated, even though it contributes to a large extent to soil organic matter, and is characterized by specific biochemical properties. In this study, we investigated the extent to which decomposition of heathland fungal biomass was affected by its hydrophobicity (extrinsic property) and melanin content (intrinsic property). We hypothesized that, as for plant biomass, hydrophobicity would have a greater impact on decomposition than melanin content. Mineralization was determined as the mineralization of soil organic carbon (SOC) into CO2 by headspace GC/MS after inoculation by a heathland soil microbial community. Results show that decomposition was not affected by hydrophobicity, but was negatively correlated with melanin content. We argue that it may indicate that either melanin content is both an intrinsic and extrinsic property, or that some soil decomposers evolved the ability to use surfactants to access to hydrophobic biomass. In the latter case, biomass hydrophobicity should not be considered as a crucial extrinsic factor. We also explored the ecology of decomposition, melanin content, and hydrophobicity, among heathland soil fungal guilds. Ascomycete black yeasts had the highest melanin content, and hyaline Basidiomycete yeasts the lowest. Hydrophobicity was an all-or-nothing trait, with most isolates being hydrophobic.

KW - decomposition

KW - fungal biomass

KW - heathland

KW - hydrophobicity

KW - melanin

M3 - Article

JO - Microbial Ecology

T2 - Microbial Ecology

JF - Microbial Ecology

SN - 0095-3628

ER -

Lenaers M, Reyns W, Czech J, Carleer R, Basak I, Deferme W et al. Links Between Heathland Fungal Biomass Mineralization, Melanization, and Hydrophobicity. Microbial Ecology. 2018.