Peculiarities of the composition of acids in Sphagnum species of the percolation bog of the Kolkheti lowland

Tetemadze, Natela; Bakuridze, A; Jokhadze, M; Machutadze, Izolda

doi:10.1016/j.aasci.2018.04.012

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…Furthermore, glucose, hydroxypropanoic acid, and xylose, all primary metabolites of microbial sugar metabolism, were significantly abundant in the control compared to the inoculum (Figures 3c and 3d). These results were intriguing since the degradation of larger sugars, such as glycosides that make up a significant part of Sphagnum complex sugars (Tetemadze et al., 2018), is dependent on specific enzyme activity and a microorganism's capacity to cleave these molecules (Berlemont & Martiny, 2016). In the absence of microorganisms in the control, it is more likely that glycosides, cellulose, and other complex sugar degradation could be occurring through abiotic‐driven reactions.…”

Section: Discussionmentioning

confidence: 99%

Sequential Abiotic‐Biotic Processes Drive Organic Carbon Transformation in Peat Bogs

et al. 2021

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Peatlands, which store one third of the terrestrial carbon (C), are subject to large disturbances under a changing climate. It is crucial to understand how microbial and physiochemical factors affect the vulnerability of these large C stores to predict climate‐induced greenhouse gas fluxes. Here, we used a combination of mass spectrometry and spectroscopy techniques, to understand sequential biotic and abiotic degradation pathways of Sphagnum fallax leachate in an anaerobic incubation experiment, in the presence and absence of microorganisms. Removal of microorganisms was carried out by passing aqueous samples through 0.2‐µm filters. Our results revealed that S. fallax leachate degradation by abiotic reactions is a significant contributor to CO2 production. Further, abiotic factors, such as low pH, are responsible for partial dissolved organic carbon (DOC) degradation that produces bioavailable compounds that shift microbial metabolic pathways and stimulate respiration in peat bogs. Acid‐catalyzed hydrolysis of Sphagnum‐ produced glycosides can provide the microbial communities with glucose and stimulate microbial respiration of DOC to CO2. These results, while unique to peatlands, demonstrate the importance and underscore the complexity of sequential abiotic and biotic processes on C cycling in peat bogs. It is therefore crucial to incorporate abiotic degradation and sequential below‐ground biotic and abiotic interactions into climate models for a better prediction of the influence of climate change on DOC stability in peatlands. These findings might not be representative of other ecosystems with different environmental conditions including mineral‐rich peatlands and plant matter in surface peat horizons that comprise discrete microbial populations, and DOC composition.

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Section: Discussionmentioning

confidence: 99%

Sequential Abiotic‐Biotic Processes Drive Organic Carbon Transformation in Peat Bogs

et al. 2021

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“…functional traits, latitudinal gradient, metabolomics, microbial traits, peatlands, plant and microbial communities, plant-soil (below-ground) interactions, Sphagnum Schellekens et al, 2015), flavonoids (Sytiuk et al, 2020), carbohydrates (Hájek et al, 2011;Painter, 1991;Tetemadze et al, 2018;van Breemen, 1995) and tannins (Sytiuk et al, 2020;Verhoeven & Liefveld, 1997), that have been related to the functioning of peatlands (Verhoeven & Liefveld, 1997). Many of these metabolites show antimicrobial properties (Fudyma et al, 2019).…”

Section: Synthesismentioning

confidence: 99%

“…Sphagnum also actively excretes bioactive metabolites (i.e. 6 biochemicals) to their surroundings such as polyphenols (Rasmussen et al, 1995a;Rasmussen et al, 1995b;Rudolph & Samland, 1985;Schellekens et al, 2015), flavonoids (Sytiuk et al, 2020), carbohydrates (Hájek et al, 2011;Painter, 1991;Tetemadze et al, 2018;van Breemen, 1995), and tannins (Sytiuk et al, 2020;Verhoeven & Liefveld, 1997), that have been related to the functioning of peatlands (Verhoeven & Liefveld, 1997). Many of these metabolites show antimicrobial properties (Fudyma et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Predicting the structure and functions of peatland microbial communities from Sphagnum phylogeny, anatomical and morphological traits and metabolites

et al. 2021

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1. Sphagnum mosses are keystone species in northern peatlands. Notably, they play an important role in peatland carbon (C) cycling by regulating the composition and activity of microbial communities. However, it remains unclear whether information on Sphagnum phylogeny and/or traits-based composition (i.e. anatomical and morphological traits and metabolites) can be used to predict the structure of microbial communities and their functioning. Here we evaluated whether Sphagnum phylogeny and traits predict additional variation in peatland microbial community composition and functioning beyond what would be predicted from environmental characteristics (i.e. climatic and edaphic conditions).2. We collected Sphagnum and microbial data from five European peatlands distributed along a latitudinal gradient from northern Sweden to southern France. This allowed us to assess Sphagnum anatomical and morphological traits and metabolites at different sites along changing environmental conditions. Using structural equation modelling (SEM) and phylogenetic distance analyses, we investigated the role of Sphagnum traits in shaping microbial community composition and functioning along with environmental conditions. We show that microbial community composition and traits varied independently from bothSphagnum phylogeny and the latitudinal gradient. Specifically, the addition of Sphagnum traits to climatic and edaphic variables to the SEM allowed it to explain a larger proportion of the explained variance (R 2 ). This observation was most apparent for the biomass of decomposers (+42%) and phototrophs (+19%), as well as for growth yield microbial traits (+10%). As such, that Sphagnum metabolites were important drivers for microbial community structure and traits, while Sphagnum anatomical and morphological traits were poor predictors. 3 4. Synthesis. Our results highlight that Sphagnum metabolites are more to influence peatland microbial food web structure and functioning than Sphagnum anatomical and morphological traits. We provide further evidence that measurements of the plant metabolome, when combined with classical functional traits, improve our understanding of how the plants interact with their associated microbiomes.

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Moss removal facilitates decomposition and net nitrogen loss of monospecific and mixed-species litter in a boreal peatland

Zhang,

Chen,

Chen

et al. 2024

Biogeochemistry

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Litter decomposition plays an important role in biogeochemical cycling in boreal peatlands, where mosses, especially Sphagnum species, are a determinant. In recent decades, these peatlands have experienced a decline in moss cover due to abrupt climate warming and atmospheric nitrogen (N) deposition. To reveal the effect of the reduction in moss cover on litter decomposition, we adopted a field living moss removal experiment (with the senesced tissues remaining) in a Sphagnum-dominated boreal peatland, and investigated litter mass loss and net N loss of three deciduous woody species decomposing in monocultures and mixtures over 3 years. Based on the observed and predicted mass loss and net N loss of litter mixtures, we divided litter mixing effects into additive (no significant difference), synergistic (observed value greater than predicted value), and antagonistic (observed value lower than predicted value) effects. Across 3 years of decomposition, moss removal increased litter mass loss and net N loss, irrespective of single- or mixed-species compositions. Moss removal generally changed litter mixing effects on mass loss from antagonistic to additive effects in the initial 2 years, but from synergistic to additive effects after 3 years of decomposition. Regarding net N loss of litter mixtures, moss removal often resulted in a shift from additive to synergistic effects or from antagonistic to additive effects after 2 and 3 years of decomposition. Our observations suggest that the declines in living moss cover can accelerate litter decomposition and nutrient release, and highlight that living moss loss makes litter mixture decomposition predictable by reducing non-additive effects in boreal peatlands. Given the widespread occurrence of reduced moss cover in boreal peatlands, the mechanisms explaining living moss controls on litter decomposition and N cycling should receive significant attention in further studies.

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Peculiarities of the composition of acids in Sphagnum species of the percolation bog of the Kolkheti lowland

Cited by 6 publications

References 9 publications

Sequential Abiotic‐Biotic Processes Drive Organic Carbon Transformation in Peat Bogs

Sequential Abiotic‐Biotic Processes Drive Organic Carbon Transformation in Peat Bogs

Predicting the structure and functions of peatland microbial communities from Sphagnum phylogeny, anatomical and morphological traits and metabolites

Moss removal facilitates decomposition and net nitrogen loss of monospecific and mixed-species litter in a boreal peatland

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