Nitrous Oxide Emission in Response to pH from Degrading Palsa Mire Peat Due to Permafrost Thawing

Takatsu, Yuta; Miyamoto, Toshizumi; Tahvanainen, Teemu; Hashidoko, Yasuyuki

doi:10.1007/s00284-021-02690-8

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…SC-H2 was small, but N 2 O could be accumulated. However, the palsa mounds are formed due to the ice core under the Sphagnum peat layer in the subarctic climate, and once they collapse after permafrost thawing, the peat acidity will be neutralized to some extent by mixing with mineral material and minerogenic water flow (Seppälä, 2011 ; Takatsu et al, 2022 ).…”

Section: Discussionmentioning

confidence: 99%

Sphagnum capillifolium holobiont from a subarctic palsa bog aggravates the potential of nitrous oxide emissions

et al. 2022

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Melting permafrost mounds in subarctic palsa mires are thawing under climate warming and have become a substantial source of N2O emissions. However, mechanistic insights into the permafrost thaw-induced N2O emissions in these unique habitats remain elusive. We demonstrated that N2O emission potential in palsa bogs was driven by the bacterial residents of two dominant Sphagnum mosses especially of Sphagnum capillifolium (SC) in the subarctic palsa bog, which responded to endogenous and exogenous Sphagnum factors such as secondary metabolites, nitrogen and carbon sources, temperature, and pH. SC's high N2O emission activity was linked with two classes of distinctive hyperactive N2O emitters, including Pseudomonas sp. and Enterobacteriaceae bacteria, whose hyperactive N2O emitting capability was characterized to be dominantly pH-responsive. As the nosZ gene-harboring emitter, Pseudomonas sp. SC-H2 reached a high level of N2O emissions that increased significantly with increasing pH. For emitters lacking the nosZ gene, an Enterobacteriaceae bacterium SC-L1 was more adaptive to natural acidic conditions, and N2O emissions also increased with pH. Our study revealed previously unknown hyperactive N2O emitters in Sphagnum capillifolium found in melting palsa mound environments, and provided novel insights into SC-associated N2O emissions.

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Section: Discussionmentioning

confidence: 99%

Sphagnum capillifolium holobiont from a subarctic palsa bog aggravates the potential of nitrous oxide emissions

et al. 2022

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“…Peatland ponds with thermokarst expansion often emit large amounts of CH 4 and have net emissions of CO 2 (Elder et al., 2021; Walter Anthony et al., 2018), while the effects on pond N 2 O fluxes are unknown. Studies of boreal peatland N 2 O fluxes in permafrost regions come primarily from northern Europe and have shown generally low N 2 O emissions from intact peat plateaus and palsas, but at times very high emissions during initial stages of permafrost thaw and soil warming associated with increased availability of inorganic N and increases in pH (Takatsu et al., 2022; Voigt, Lamprecht, et al., 2017). Thermokarst wetlands with mineral soils have in some regions led to high N 2 O emissions (Abbott & Jones, 2015; Marushchak et al., 2021; Yang et al., 2018), but N 2 O emissions did not increase with the development of Tibetan thermokarst bogs (Sun et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

Nitrous Oxide Fluxes in Permafrost Peatlands Remain Negligible After Wildfire and Thermokarst Disturbance

et al. 2023

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Lactobacillus rhamnosus and L. plantarum Combination Treatment Ameliorated Colitis Symptoms in a Mouse Model by Altering Intestinal Microbial Composition and Suppressing Inflammatory Response

Liu

Zhang

Xie

et al. 2023

Molecular Nutrition Food Res

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Scope Changes in composition of intestinal microbes may disrupt the balance of their interaction with a susceptible host, resulting in development of inflammatory bowel disease (IBD). Methods and results The study applied in combination two Lactobacillus strains (L. rhamnosus BY‐02, L. plantarum BY‐05) (“LS treatment”), previously isolates from feces of healthy human infants, in a mouse model of dextran sodium sulfate (DSS)‐induced colitis, and evaluates their ameliorative effect and its possible mechanism. LS treatment suppresses weight loss and colon shortening, and reduces disease activity index in the mice. It also has several additional beneficial effects: i) maintains goblet cell numbers and ameliorates intestinal barrier damage in colonic tissue; ii) alters intestinal microbial composition close to normal by increasing abundances of Muribaculaceae, Akkermansia, Clostridia, Oscillospiraceae, and Lachnospiraceae, and decreasing abundance of Escherichia‐Shigella; iii) increases content of short‐chain fatty acids; iv) reduces content of pro‐inflammatory lipopolysaccharides; v) suppresses overactivation of TLR4/NF‐κB inflammatory signaling pathway. Conclusion Combination treatment with two Lactobacillus strains strongly ameliorates colitis symptoms in the mouse model by favorably altering intestinal microbial composition and suppressing inflammatory response.

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Nitrous Oxide Emission in Response to pH from Degrading Palsa Mire Peat Due to Permafrost Thawing

Cited by 3 publications

References 27 publications

Sphagnum capillifolium holobiont from a subarctic palsa bog aggravates the potential of nitrous oxide emissions

Sphagnum capillifolium holobiont from a subarctic palsa bog aggravates the potential of nitrous oxide emissions

Nitrous Oxide Fluxes in Permafrost Peatlands Remain Negligible After Wildfire and Thermokarst Disturbance

Lactobacillus rhamnosus and L. plantarum Combination Treatment Ameliorated Colitis Symptoms in a Mouse Model by Altering Intestinal Microbial Composition and Suppressing Inflammatory Response

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