Laccases: toward disentangling their diversity and functions in relation to soil organic matter cycling

Theuerl, Susanne; Buscot, François

doi:10.1007/s00374-010-0440-5

Cited by 93 publications

(45 citation statements)

References 93 publications

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“…Our results also suggest that EMF in spruce soils are directly involved in the breakdown of lignin and humic complexes, supporting research that suggests that increased mycorrhizal activity associated with climate change will stimulate decomposition of previously highly recalcitrant SOM-C (Cheng et al, 2012;Phillips et al, 2012b).The oxidative enzymes involved in the decomposition of these compounds are broadly classified as phenol oxidases (including laccase and tyrosinase) and peroxidases (including lignin and broad spectrum peroxidases) (Sinsabaugh, 2010;Theuerl and Buscot, 2010). Enzyme assays typically do not differentiate between the individual enzymes and instead measure the activity of the broad classes (Sinsabaugh, 2010;German et al, 2011;Eichlerová et al, 2012).…”

Section: Discussionsupporting

confidence: 52%

Ectomycorrhizal fungi contribute to soil organic matter cycling in sub-boreal forests

2013

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Soils of northern temperate and boreal forests represent a large terrestrial carbon (C) sink. The fate of this C under elevated atmospheric CO 2 and climate change is still uncertain. A fundamental knowledge gap is the extent to which ectomycorrhizal fungi (EMF) and saprotrophic fungi contribute to C cycling in the systems by soil organic matter (SOM) decomposition. In this study, we used a novel approach to generate and compare enzymatically active EMF hyphae-dominated and saprotrophic hyphae-enriched communities under field conditions. Fermentation-humus (FH)-filled mesh bags, surrounded by a sand barrier, effectively trapped EMF hyphae with a community structure comparable to that found in the surrounding FH layer, at both trophic and taxonomic levels. In contrast, over half the sequences from mesh bags with no sand barrier were identified as belonging to saprotrophic fungi. The EMF hyphae-dominated systems exhibited levels of hydrolytic and oxidative enzyme activities that were comparable to or higher than saprotroph-enriched systems. The enzymes assayed included those associated with both labile and recalcitrant SOM degradation. Our study shows that EMF hyphae are likely important contributors to current SOM turnover in sub-boreal systems. Our results also suggest that any increased EMF biomass that might result from higher below-ground C allocation by trees would not suppress C fluxes from sub-boreal soils.

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Section: Discussionsupporting

confidence: 52%

Ectomycorrhizal fungi contribute to soil organic matter cycling in sub-boreal forests

2013

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“…Fungi are often claimed to be responsible for the production of most lignocellulose-degrading enzymes in soils Baldrian and Valášková, 2008;Caldwell, 2005;Moller et al, 1999;Theuerl and Buscot, 2010). Indeed, a previous study determined that the fungal biomass content was a better predictor of the activity of several enzymes in hardwood forest soils than the bacterial or total biomass (Baldrian et al, 2010a).…”

Section: Environmental Factors Affecting the Spatial Distribution Of mentioning

confidence: 99%

Distribution of Extracellular Enzymes in Soils: Spatial Heterogeneity and Determining Factors at Various Scales

Baldrián

2014

Soil Science Society of America Journal

128

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“…The relationship between bacterial community composition (BCC) and organic carbon is a much debated topic in microbial ecology (Torsvik & Øvreas, 2002;Griffiths et al, 2003;Zak et al, 2003;Philippot & Hallin, 2005;Judd et al, 2006;Fornara & Tilman, 2009;Theuerl & Buscot, 2010). While some studies have shown that BCC plays a role in determining functional responses to DOC source and quality (Eiler et al, 2003;Carlson et al, 2004;Kirchman et al, 2004;Judd et al, 2006;Kritzberg et al, 2006), others have observed no such relationship (van Mooy et al, 2004;Langenheder et al, 2005Langenheder et al, , 2006.…”

Section: Introductionmentioning

confidence: 96%

Bacterial community composition and function along a river to reservoir transition

Moitra

Leff

2014

Hydrobiologia

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Bacteria in reservoir systems are controlled by a variety of factors. In this study, a lacustrine system with high primary production fed by a river with lower algal biomass was used to examine the relationship between bacterial community composition (BCC) and function under varying environmental conditions. Bacterial abundance, respiration, production, and growth efficiency were measured in the Cuyahoga River and Lake Rockwell reservoir in Ohio (USA). BCC was determined via terminal restriction length polymorphisms of 16S rRNA genes. Also, in laboratory experiments, bacterial communities were exposed to algal exudates and leaf leachates. Concurrently with physicochemical differences between lacustrine and riverine sites, there were differences in BCC that seemed unrelated to environmental conditions and DOC sources (color: chlorophyll a ratio). Functional attributes varied among dates but not sites, except for bacterial heterotrophic productivity. Overall, the source of DOC differed between the river and reservoir as did BCC. In contrast, bacterial functions, with the exception of productivity, were similar between the river and reservoir sites. Environmental variables (e.g., temperature, nutrient, and chlorophyll a) were correlated with differences in bacterial function. Differences in BCC did not coincide with functional differences in the field or controlled laboratory conditions suggesting that structure and function were uncoupled.

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Laccases: toward disentangling their diversity and functions in relation to soil organic matter cycling

Cited by 93 publications

References 93 publications

Ectomycorrhizal fungi contribute to soil organic matter cycling in sub-boreal forests

Ectomycorrhizal fungi contribute to soil organic matter cycling in sub-boreal forests

Distribution of Extracellular Enzymes in Soils: Spatial Heterogeneity and Determining Factors at Various Scales

Bacterial community composition and function along a river to reservoir transition

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