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  • 1.
    Ahlberg, Emelie
    et al.
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten.
    Martí Generó, Magalí Martí
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten.
    Govindaraj, Dhanapal
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten.
    Severin, Elisabet
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten.
    Duchén, Karel
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Medicincentrum, Allergicentrum US.
    Jenmalm, Maria
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten.
    Tingö, Lina
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten. Orebro Univ, Sweden.
    Immune-related microRNAs in breast milk and their relation to regulatory T cells in breastfed children2023Ingår i: Pediatric Allergy and Immunology, ISSN 0905-6157, E-ISSN 1399-3038, Vol. 34, nr 4, artikel-id e13952Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    BackgroundThe immunomodulatory capacity of breast milk may partially be mediated by microRNAs (miRNA), small RNA molecules that regulate gene expression on a post-transcriptional level and are hypothesized to be involved in modulation of immunological pathways. Here, we evaluate the expression of immune-related miRNAs in breast milk after pre- and postnatal supplementation with Limosilactobacillus reuteri and omega-3 (omega-3) polyunsaturated fatty acids (PUFAs), and the association to infant regulatory T cell (Treg) frequencies. MethodsOne-hundred and twenty women included in a double-blind, randomized, placebo-controlled allergy intervention trial received L. reuteri and/or omega-3 PUFAs daily from gestational week 20. Using Taqman qPCR, 24 miRNAs were analyzed from breast milk obtained at birth (colostrum) and after 3 months (mature milk) of lactation. The proportion of activated and resting Treg cells were analyzed in infant blood using flow cytometry at 6, 12, and 24 months. ResultsRelative expression changed significantly over the lactation period for most of the miRNAs; however, the expression was not significantly influenced by any of the supplements. Colostrum miR-181a-3p correlated with resting Treg cell frequencies at 6 months. Colostrum miR-148a-3p and let-7d-3p correlated with the frequencies of activated Treg cells at 24 months, as did mature milk miR-181a-3p and miR-181c-3p. ConclusionMaternal supplementation with L. reuteri and omega-3 PUFAs did not significantly affect the relative miRNA expression in breast milk. Interestingly, some of the miRNAs correlate with Treg subpopulations in the breastfed children, supporting the hypothesis that breast milk miRNAs could be important in infant immune regulation. Trial registrationClinicalTrials.gov-ID: NCT01542970.

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  • 2.
    Hellysaz, Arash
    et al.
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för molekylär medicin och virologi. Linköpings universitet, Medicinska fakulteten.
    Nordgren, Johan
    Linköpings universitet, Medicinska fakulteten. Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för molekylär medicin och virologi.
    Neijd, Magdalena
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för molekylär medicin och virologi. Linköpings universitet, Medicinska fakulteten.
    Generó, Magali Marti
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten.
    Svensson, Lennart
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för molekylär medicin och virologi. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Medicincentrum, Infektionskliniken i Östergötland. Division of Infectious Diseases, Department of Medicine, Karolinska Institute, Stockholm, Sweden.
    Hagbom, Marie
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för molekylär medicin och virologi. Linköpings universitet, Medicinska fakulteten.
    Microbiota do not restrict rotavirus infection of colon2023Ingår i: Journal of Virology, ISSN 0022-538X, E-ISSN 1098-5514, Vol. 97, nr 11, artikel-id e01526-23Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Rotavirus is associated with extensive infection of the small intestine, whereas colon is considered to be uninfected. Considering that almost all bacteria in the gut colonize the colon, we hypothesized that the microbiota may act as a physical barrier preventing rotavirus infection in the colon in vivo. To address this hypothesis, we used human and mice colonoids, and biopsies of different intestinal segments of untreated and antibiotic-treated adult and infant mice. Rotavirus quantification was performed by qPCR and volumetric 3D imaging of intestinal segments. By 3D imaging, we observed infection in all the small intestinal segments, most extensively in the ileum, with most limited number of infected cells in colon. Broad-spectrum antibiotic treatment yielded no significant change in infection in either ileum or colon of adults and mice pups, although there is a substantial decrease in microbial load. We also show that rotavirus can successfully infect and replicate in colonoids from both mice and humans. Collectively, our data, including novel 3D imaging of the gut, mouse, and human colonoids, conclude that microbiota does not affect rotavirus infection in colon.

    IMPORTANCE

    Alterations of the gut microbiome can have significant effects on gastrointestinal homeostasis leading to various diseases and symptoms. Increased understanding of rotavirus infection in relation to the microbiota can provide better understanding on how microbiota can be used for clinical prevention as well as treatment strategies. Our volumetric 3D imaging data show that antibiotic treatment and its consequent reduction of the microbial load does not alter the extent of rotavirus infection of enterocytes in the small intestine and that restriction factors other than bacteria limit the infection of colonocytes.

  • 3.
    Martí Generó, Magalí Martí
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten.
    Magali Marti2022Ingår i: Cell Reports Medicine, E-ISSN 2666-3791 , Vol. 3, nr 4, artikel-id 100590Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    Magali Marti aims to improve infant health by modulation of the gut microbiome with probiotic and prebiotics. She studies how supplementation-induced changes in the microbiome-immune crosstalk affect growth, allergy prevention, and cognitive development. In this Q&A, she discusses her research, views, challenges, and the future of her field.

  • 4.
    Generó, Magalí Martí
    et al.
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten.
    Spreckels, Johanne
    Linköpings universitet, Medicinska fakulteten. Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Department of Genetics, University Medical Centre Groningen, Groningen, the Netherlands.
    Jenmalm, Maria
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten.
    Abrahamsson, Thomas
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Barn- och kvinnocentrum, H.K.H. Kronprinsessan Victorias barn- och ungdomssjukhus.
    A protocol for characterization of extremely preterm infant gut microbiota in double-blind clinical trials2021Ingår i: STAR Protocols, ISSN 2666-1667, Vol. 2, nr 3, artikel-id 100652Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    16S rRNA gene sequencing enables microbial community profiling, but recovering fecal DNA from extremely premature infants is challenging. Here, we describe an optimized protocol for fecal DNA isolation, library preparation for 16S rRNA gene sequencing, taxonomy assignation, and statistical analyses. The protocol is complemented with a quantitative PCR for probiotic L. reuteri identification. This protocol describes how to characterize preterm infant gut microbiota and relate it to probiotic supplementation and clinical outcomes. It is customizable for other clinical trials. For complete details on the use and execution of this protocol, please refer to Martí et al. (2021) and Spreckels et al. (2021).

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  • 5.
    Martí Generó, Magalí Martí
    et al.
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten.
    Spreckels, Johanne
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten. Univ Med Ctr Groningen, Netherlands.
    Ranasinghe, Purnika
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten. Queens Univ Belfast, North Ireland.
    Wejryd, Erik
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Barn- och kvinnocentrum, Barn- och ungdomskliniken i Norrköping.
    Marchini, Giovanna
    Karolinska Univ Hosp & Inst, Sweden.
    Sverremark-Ekstrom, Eva
    Stockholm Univ, Sweden.
    Jenmalm, Maria
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten.
    Abrahamsson, Thomas
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Barn- och kvinnocentrum, H.K.H. Kronprinsessan Victorias barn- och ungdomssjukhus.
    Effects of Lactobacillus reuteri supplementation on the gut microbiota in extremely preterm infants in a randomized placebo-controlled trial2021Ingår i: Cell Reports Medicine, E-ISSN 2666-3791 , Vol. 2, nr 3, artikel-id 100206Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Extremely low birth weight (ELBW) infants often develop an altered gut microbiota composition, which is related to clinical complications, such as necrotizing enterocolitis and sepsis. Probiotic supplementation may reduce these complications, and modulation of the gut microbiome is a potential mechanism underlying the probiotic effectiveness. In a randomized, double-blind, placebo-controlled trial, we assessed the effect of Lactobacillus reuteri supplementation, from birth to post-menstrual week (PMW)36, on infant gut microbiota. We performed 16S amplicon sequencing in 558 stool samples from 132 ELBW preterm infants at 1 week, 2 weeks, 3 weeks, 4 weeks, PMW36, and 2 years. Probiotic supplementation results in increased bacterial diversity and increased L. reuteri abundance during the 1st month. At 1 week, probiotic supplementation also results in a lower abundance of Enterobacteriaceae and Staphylococcaceae. No effects were found at 2 years. In conclusion, probiotics may exert benefits by modulating the gut microbiota composition during the 1st month in ELBW infants.

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  • 6.
    Spreckels, Johanne
    et al.
    Linköpings universitet, Medicinska fakulteten. Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper. Univ Med Ctr Groningen, Netherlands.
    Wejryd, Erik
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Barn- och kvinnocentrum, Barn- och ungdomskliniken i Norrköping.
    Marchini, Giovanna
    Karolinska Univ Hosp & Inst, Sweden.
    Jonsson, Baldvin
    Karolinska Univ Hosp & Inst, Sweden.
    de Vries, Dylan H.
    Univ Med Ctr Groningen, Netherlands.
    Jenmalm, Maria
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för inflammation och infektion. Linköpings universitet, Medicinska fakulteten.
    Landberg, Eva
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för cellbiologi. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Diagnostikcentrum, Klinisk kemi.
    Sverremark-Ekstrom, Eva
    Stockholm Univ, Sweden.
    Generó, Magali Marti
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper. Linköpings universitet, Medicinska fakulteten.
    Abrahamsson, Thomas
    Linköpings universitet, Institutionen för biomedicinska och kliniska vetenskaper, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Barn- och kvinnocentrum, H.K.H. Kronprinsessan Victorias barn- och ungdomssjukhus.
    Lactobacillus reuteri Colonisation of Extremely Preterm Infants in a Randomised Placebo-Controlled Trial2021Ingår i: Microorganisms, E-ISSN 2076-2607, Vol. 9, nr 5, artikel-id 915Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Lactobacillus reuteri DSM 17938 supplementation reduces morbidities in very low birth weight infants (<1500 g), while the effect on extremely low birth weight infants (ELBW, <1000 g) is still questioned. In a randomised placebo-controlled trial (ClinicalTrials.gov ID NCT01603368), head growth, but not feeding tolerance or morbidities, improved in L. reuteri-supplemented preterm ELBW infants. Here, we investigate colonisation with the probiotic strain in preterm ELBW infants who received L. reuteri DSM 17938 or a placebo from birth to postmenstrual week (PMW) 36. Quantitative PCR was used on 582 faecal DNA samples collected from 132 ELBW infants at one, two, three, and four weeks, at PMW 36, and at two years of age. Human milk oligosaccharides were measured in 31 milk samples at two weeks postpartum. At least 86% of the ELBW infants in the L. reuteri group were colonised with the probiotic strain during the neonatal period, despite low gestational age, high antibiotic pressure, and independent of infant feeding mode. Higher concentrations of lacto-N-tetraose, sialyl-lacto-N-neotetraose c, and 6 -sialyllactose in mothers milk weakly correlated with lower L. reuteri abundance. Within the L. reuteri group, higher L. reuteri abundance weakly correlated with a shorter time to reach full enteral feeding. Female sex and L. reuteri colonisation improved head growth from birth to four weeks of age. In conclusion, L. reuteri DSM 17938 supplementation leads to successful colonisation in ELBW infants.

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  • 7.
    Robroek, Bjorn J. M.
    et al.
    Aquatic Ecology and Environmental Biology, Inst. for Water and Wetland Research, Faculty of Science, Radboud Univ. Nijmegen, Nijmegen, the Netherlands.
    Marti, Magali
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Svensson, Bo H
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Dumont, Marc G.
    School of Biological Sciences, Faculty of Environmental and Life Sciences, Univ. of Southampton, Southampton, UK.
    Veraart, Annelies J.
    Aquatic Ecology and Environmental Biology, Inst. for Water and Wetland Research, Faculty of Science, Radboud Univ. Nijmegen, Nijmegen, the Netherlands.
    Jassey, Vincent E. J.
    Laboratoire d'Ecologie Fonctionnelle et Environnement, Univ. de Toulouse, CNRS, Toulouse Cedex, France.
    Rewiring of peatland plant–microbe networks outpaces species turnover2021Ingår i: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 130, nr 3, s. 339-353Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Enviro‐climatic changes are thought to be causing alterations in ecosystem processes through shifts in plant and microbial communities; however, how links between plant and microbial communities change with enviro–climatic change is likely to be less straightforward but may be fundamental for many ecological processes. To address this, we assessed the composition of the plant community and the prokaryotic community – using amplicon‐based sequencing – of three European peatlands that were distinct in enviro–climatic conditions. Bipartite networks were used to construct site‐specific plant–prokaryote co‐occurrence networks. Our data show that between sites, plant and prokaryotic communities differ and that turnover in interactions between the communities was complex. Essentially, turnover in plant–microbial interactions is much faster than turnover in the respective communities. Our findings suggest that network rewiring does largely result from novel or different interactions between species common to all realised networks. Hence, turnover in network composition is largely driven by the establishment of new interactions between a core community of plants and microorganisms that are shared among all sites. Taken together our results indicate that plant–microbe associations are context dependent, and that changes in enviro–climatic conditions will likely lead to network rewiring. Integrating turnover in plant–microbe interactions into studies that assess the impact of enviro–climatic change on peatland ecosystems is essential to understand ecosystem dynamics and must be combined with studies on the impact of these changes on ecosystem processes.

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  • 8.
    Marti, M.
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Nilsson, M. B.
    Swedish Univ Agr Sci, Sweden.
    Danielsson, Åsa
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Lindgren, Per-Eric
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för mikrobiologi, infektion och inflammation. Linköpings universitet, Medicinska fakulteten.
    Svensson, Bo
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Strong long-term interactive effects of warming and enhanced nitrogen and sulphur deposition on the abundance of active methanogens in a boreal oligotrophic mire2019Ingår i: Mires and Peat, E-ISSN 1819-754X, Vol. 24, s. 1-14, artikel-id 29Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Peatlands play a key role in the carbon cycle by being a considerable source of atmospheric methane. Thus, an understanding of the microbial production of methane is important in relation to environmental changes of peatlands. We applied real-time PCR on the mcrA gene and transcript to investigate the peat methanogen community response to the combined effect of 18 years of simulated warming and deposition of nitrogen (N) and sulphur (S) at a boreal oligotrophic mire in Sweden. The long-term effects of the experimental treatments on the methanogens was highly dependent on interactions between the treatment factors Enhanced N deposition amplified the effect of warming, resulting in a further increase of the abundance of active methanogens. The effect of the perturbations was modulated by the depth horizon, with the strongest effect at the water level, where the interaction between enhanced N and S deposition, and warming, resulted in an increase of active methanogens. These results indicate that increasing average temperatures and simultaneously higher N deposition rates will substantially increase the methanogenic activity in northern ombrotrophic peatlands. These findings strongly highlight the importance of accounting for any possible interactive perturbation effects when investigating the response of peat methanogens to environmental change.

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  • 9.
    Wejryd, Erik
    et al.
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Barn- och kvinnocentrum, Barn- och ungdomskliniken i Norrköping.
    Generó, Magali Marti
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för neuro- och inflammationsvetenskap. Linköpings universitet, Medicinska fakulteten.
    Marchini, Giovanna
    Karolinska Univ Hosp, Sweden; Karolinska Inst, Sweden.
    Werme, Anna
    Linköpings universitet, Institutionen för klinisk och experimentell medicin. Linköpings universitet, Medicinska fakulteten.
    Jonsson, Baldvin
    Karolinska Univ Hosp, Sweden; Karolinska Inst, Sweden.
    Landberg, Eva
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för cellbiologi. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Diagnostikcentrum, Klinisk kemi.
    Abrahamsson, Thomas
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för barns och kvinnors hälsa. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Barn- och kvinnocentrum, H.K.H. Kronprinsessan Victorias barn- och ungdomssjukhus.
    Low Diversity of Human Milk Oligosaccharides is Associated with Necrotising Enterocolitis in Extremely Low Birth Weight Infants2018Ingår i: Nutrients, E-ISSN 2072-6643, Vol. 10, nr 10, artikel-id 1556Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Difference in human milk oligosaccharides (HMO) composition in breast milk may be one explanation why some preterm infants develop necrotizing enterocolitis (NEC) despite being fed exclusively with breast milk. The aim of this study was to measure the concentration of 15 dominant HMOs in breast milk during the neonatal period and investigate how their levels correlated to NEC, sepsis, and growth in extremely low birth weight (ELBW; amp;lt;1000 g) infants who were exclusively fed with breast milk. Milk was collected from 91 mothers to 106 infants at 14 and 28 days and at postmenstrual week 36. The HMOs were analysed with high-performance anion-exchange chromatography with pulsed amperometric detection. The HMOs diversity and the levels of Lacto-N-difucohexaose I were lower in samples from mothers to NEC cases, as compared to non-NEC cases at all sampling time points. Lacto-N-difucohexaose I is only produced by secretor and Lewis positive mothers. There were also significant but inconsistent associations between 3-sialyllactose and 6-sialyllactose and culture-proven sepsis and significant, but weak correlations between several HMOs and growth rate. Our results suggest that the variation in HMO composition in breast milk may be an important factor explaining why exclusively breast milk fed ELBW infants develop NEC.

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  • 10. Beställ onlineKöp publikationen >>
    Genero, Magalí Martí
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Microbial Communities in Boreal Peatlands: Responses to Climate Change and Atmospheric Nitrogen and Sulfur Depositions2017Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [sv]

    Myrmarker har en stor roll i regleringen av den globala kolbalansen och koncentrationerna av koldioxid och metan i atmosfären, vilket gör dem till speciellt viktiga ekosystem ur ett klimatförandringsperspektiv. Förändringar av myrmarker genom naturlig utveckling eller antropogen påverkan kan därför få långtgående störningar av myrars klimatreglerande funktion. Mikroorganismer har en avgörande roll i biogeokemiska processer genom att t ex bryta ned organisk material i mark och därmed styra kolets kretslopp. För att förstå hur myrsystemen reagerar på störningar är det därför väsentligt att veta hur mikroorganismsamhällena reagerar genom förändringar i sammansättning och biogeokemisk aktivitet. Målet för studierna, som ligger till grund för denna avhandling, var att undersöka hur mikroorganismsamhällen i myrar reagerar på uppvärmning genom klimatförändring och ökade kväve- (N) och svavel- (S) halter i nederbörd. High through-put sekvensering användes för att studera taxonomiska och funktionella egenskaper hos mikroorganismerna i myrar och quantative PCR användes för att mer specifikt studera de metanbildande arkeorna. Två fältkampanjer vardera omfattande tre ombrotrofa myrar med olika klimatförhållanden och olika mängder N och S inederbörden användes för att undersöka lokala och storskaliga effekter på myrars mikrobiella samhällen. Resultaten visade att latudinell variation i geoklimatologiska förhållanden (temperatur ochnederbördsmängd) och deposition av näringsämnen hade en påverkan på sammansättningen av de mikrobiella samhällena och aktiva metanbildare förr än variationen i den kemiska miljön inom varje specifik myr. Myrväxtsamhällenas sammansättning för en specifik myr visades sig i stor utsträckning styra sammansättningen av motsvarande mikrobiella samhälle i torvprofilen. Detta framgick klart av i en analys av samexisterande nätverk av mikroorganismsamhällen och motsvarande växtsamhällen i en studie av tre geografiskt skilda myrar med olika kvävedeposition. Effekterna av klimatförändring och nederbörd med olika mängder av N och S studerades mer specifikt genom att analysera de mikrobiellasamhällena i  ett långliggande (18 år) försök. Påverkan av var och en av dessa manipulationer antingen förstärktes eller minskades, när de förekom i kombinationer. Ökad kvävedeposition var den faktor som hade starkast effekt. De långvariga störningarna medförde stora förändringar i den mikrobiella taxonomin inom samhällena. Detta återspeglades dock inte i den fysiologiska kapaciteten, vilket visar att det finns en stark buffring i myrarnas mikrobiella funktion. Detta tyder på att framtida utveckling av myrar i relation till olika störningar sannolikt inte kommer att påverka myrarnas roll för kolbalans och växthusgasutbyte med atmosfären.

    Delarbeten
    1. Nitrogen and methanogen community composition within and among three Sphagnum dominated peatlands in Scandinavia
    Öppna denna publikation i ny flik eller fönster >>Nitrogen and methanogen community composition within and among three Sphagnum dominated peatlands in Scandinavia
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    2015 (Engelska)Ingår i: Soil Biology and Biochemistry, ISSN 0038-0717, E-ISSN 1879-3428, Vol. 81, s. 204-211Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Ombrotrophic raised bogs are nutrient poor acidic peatlands accumulating organic matter. They are widely spread on northern latitudes and are substantial sources of methane emissions to the atmosphere being of great concern from a climate change perspective. We investigated the methanogen community composition along microtopographic gradients within three bogs in Scandinavia, receiving different amounts of nitrogen precipitation. Methanogenic community analyses by terminal restriction fragment length polymorphism of the mcrA gene showed different profiles among the three sites, while no in- fluence of the microtopographic gradients was observed. Peat temperature and dissolved organic carbon were the major edaphic variables explaining 38% of the variation of the methanogenic community di- versity among the bogs. The family Methanoregulaceae (hydrogenotrophic methanogens) showed the largest relative proportion and highest activity in all three sites. Quantitative PCR of the mcrA gene and transcripts showed that the most northern site, receiving the lowest atmospheric nitrogen load, had significantly lower abundance and activity of methanogens (4.7 106 and 2.4 104 mcrA copies per gram of soil, respectively), compared to the most southern site (8.2 107 and 4.6 105 mcrA copies per gram of soil, respectively), receiving the highest nitrogen load. No patterns of the mcrA gene and tran- script abundances were observed along the microtopography. The results indicated that the difference in occurrence of methanogens is mainly due to geoclimatological conditions rather than site intrinsic microtopographic variation. The study further suggests that environmental changes on the site intrinsic topography will not affect the methanogenic activity, while increasing average temperatures in Scan- dinavian ombrotrophic raised bogs might contribute to an increase of the methanogenic archaeal activity resulting in an increase of methane production. 

    Ort, förlag, år, upplaga, sidor
    Elsevier, 2015
    Nyckelord
    Methanogenic arhcaea, mcrA gene, peatland, microtopography, T-RFLP, qPCR
    Nationell ämneskategori
    Ekologi Mikrobiologi Miljövetenskap
    Identifikatorer
    urn:nbn:se:liu:diva-113846 (URN)10.1016/j.soilbio.2014.11.016 (DOI)000350524700024 ()
    Tillgänglig från: 2015-02-02 Skapad: 2015-02-02 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
    2. Rewiring of peatland plant–microbe networks outpaces species turnover
    Öppna denna publikation i ny flik eller fönster >>Rewiring of peatland plant–microbe networks outpaces species turnover
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    2021 (Engelska)Ingår i: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 130, nr 3, s. 339-353Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Enviro‐climatic changes are thought to be causing alterations in ecosystem processes through shifts in plant and microbial communities; however, how links between plant and microbial communities change with enviro–climatic change is likely to be less straightforward but may be fundamental for many ecological processes. To address this, we assessed the composition of the plant community and the prokaryotic community – using amplicon‐based sequencing – of three European peatlands that were distinct in enviro–climatic conditions. Bipartite networks were used to construct site‐specific plant–prokaryote co‐occurrence networks. Our data show that between sites, plant and prokaryotic communities differ and that turnover in interactions between the communities was complex. Essentially, turnover in plant–microbial interactions is much faster than turnover in the respective communities. Our findings suggest that network rewiring does largely result from novel or different interactions between species common to all realised networks. Hence, turnover in network composition is largely driven by the establishment of new interactions between a core community of plants and microorganisms that are shared among all sites. Taken together our results indicate that plant–microbe associations are context dependent, and that changes in enviro–climatic conditions will likely lead to network rewiring. Integrating turnover in plant–microbe interactions into studies that assess the impact of enviro–climatic change on peatland ecosystems is essential to understand ecosystem dynamics and must be combined with studies on the impact of these changes on ecosystem processes.

    Ort, förlag, år, upplaga, sidor
    Wiley-Blackwell Publishing Inc., 2021
    Nyckelord
    16S amplicon sequencing, 16S rRNA, bipartite networks, microbial and plant diversity, peatlands, plant–microbe interactions
    Nationell ämneskategori
    Ekologi
    Identifikatorer
    urn:nbn:se:liu:diva-173027 (URN)10.1111/oik.07635 (DOI)000608571500001 ()2-s2.0-85099484361 (Scopus ID)
    Tillgänglig från: 2021-01-27 Skapad: 2021-01-27 Senast uppdaterad: 2022-03-08Bibliografiskt granskad
    3. Strong long-term interactive effects of warming and enhanced nitrogen and sulphur deposition on the abundance of active methanogens in a boreal oligotrophic mire
    Öppna denna publikation i ny flik eller fönster >>Strong long-term interactive effects of warming and enhanced nitrogen and sulphur deposition on the abundance of active methanogens in a boreal oligotrophic mire
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    2019 (Engelska)Ingår i: Mires and Peat, E-ISSN 1819-754X, Vol. 24, s. 1-14, artikel-id 29Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Peatlands play a key role in the carbon cycle by being a considerable source of atmospheric methane. Thus, an understanding of the microbial production of methane is important in relation to environmental changes of peatlands. We applied real-time PCR on the mcrA gene and transcript to investigate the peat methanogen community response to the combined effect of 18 years of simulated warming and deposition of nitrogen (N) and sulphur (S) at a boreal oligotrophic mire in Sweden. The long-term effects of the experimental treatments on the methanogens was highly dependent on interactions between the treatment factors Enhanced N deposition amplified the effect of warming, resulting in a further increase of the abundance of active methanogens. The effect of the perturbations was modulated by the depth horizon, with the strongest effect at the water level, where the interaction between enhanced N and S deposition, and warming, resulted in an increase of active methanogens. These results indicate that increasing average temperatures and simultaneously higher N deposition rates will substantially increase the methanogenic activity in northern ombrotrophic peatlands. These findings strongly highlight the importance of accounting for any possible interactive perturbation effects when investigating the response of peat methanogens to environmental change.

    Ort, förlag, år, upplaga, sidor
    Dundee, United Kingdom: Mires and Peat, 2019
    Nyckelord
    field experiment; mcrA gene and transcript; nitrogen; real-time PCR; warming
    Nationell ämneskategori
    Ekologi
    Identifikatorer
    urn:nbn:se:liu:diva-162895 (URN)10.19189/MaP.2019.OMB.398 (DOI)000500515100007 ()
    Anmärkning

    Funding Agencies|Swedish Research Council FORMASSwedish Research CouncilSwedish Research Council Formas [2007-666]; Swedish Research Council (VR)Swedish Research Council [621-2011-4901]

    Tillgänglig från: 2020-01-02 Skapad: 2020-02-19 Senast uppdaterad: 2024-04-04Bibliografiskt granskad
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  • 11.
    Robroek, Björn J. M.
    et al.
    University of Utrecht, Netherlands; University of Southampton, England.
    Jassey, Vincent E. J.
    University of Toulouse, France.
    Payne, Richard J.
    Manchester Metropolitan University, England; University of York, England.
    Marti, Magali
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Bragazza, Luca
    University of Ferrara, Italy; Ecole Polytech Federal Lausanne, Switzerland; WSL Swiss Federal Institute Forest Snow and Landscape Research, Switzerland.
    Bleeker, Albert
    PBL Netherlands Environm Assessment Agency, Netherlands.
    Buttler, Alexandre
    University of Ferrara, Italy; Ecole Polytech Federal Lausanne, Switzerland.
    Caporn, Simon J. M.
    Manchester Metropolitan University, England.
    Dise, Nancy B.
    Manchester Metropolitan University, England; Centre Ecol and Hydrol, Scotland.
    Kattge, Jens
    Max Planck Institute Biogeochem, Germany; German Centre Integrat Biodivers Research iDiv, Germany.
    Zajac, Katarzyna
    University of Bayreuth, Germany; University of Bayreuth, Germany.
    Svensson, Bo
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    van Ruijven, Jasper
    Wageningen University of and Research Centre, Netherlands.
    Verhoeven, Jos T. A.
    University of Utrecht, Netherlands.
    Taxonomic and functional turnover are decoupled in European peat bogs2017Ingår i: Nature Communications, E-ISSN 2041-1723, Vol. 8, artikel-id 1161Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In peatland ecosystems, plant communities mediate a globally significant carbon store. The effects of global environmental change on plant assemblages are expected to be a factor in determining how ecosystem functions such as carbon uptake will respond. Using vegetation data from 56 Sphagnum-dominated peat bogs across Europe, we show that in these ecosystems plant species aggregate into two major clusters that are each defined by shared response to environmental conditions. Across environmental gradients, we find significant taxonomic turnover in both clusters. However, functional identity and functional redundancy of the community as a whole remain unchanged. This strongly suggests that in peat bogs, species turnover across environmental gradients is restricted to functionally similar species. Our results demonstrate that plant taxonomic and functional turnover are decoupled, which may allow these peat bogs to maintain ecosystem functioning when subject to future environmental change.

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  • 12.
    Moestedt, J.
    et al.
    Linköpings universitet, Biogas Research Center. Department of R&D Biogas, Tekniska verken i Linköping AB, Linköping, Sweden; Department of Microbiology, BioCenter, University of Agricultural Sciences, Uppsala, Sweden.
    Nordell, E.
    Linköpings universitet, Biogas Research Center. Department of R&D Biogas, Tekniska verken i Linköping AB, Linköping, Sweden.
    Shakeri Yekta, Sepehr
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Biogas Research Center.
    Lundgren, J.
    Linköpings universitet, Biogas Research Center. Department of R&D Biogas, Tekniska verken i Linköping AB, Linköping, Sweden.
    Marti, Magali
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Biogas Research Center.
    Sundberg, Carina
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Biogas Research Center.
    Ejlertsson, Jörgen
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Biogas Research Center. Scandinavian Biogas Fuels AB, Sweden.
    Svensson, Bo
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Biogas Research Center.
    Björn, Annika
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Biogas Research Center.
    Effects of trace element addition on process stability during anaerobic co-digestion of OFMSW and slaughterhouse waste2016Ingår i: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 47, nr Pt A, s. 11-20Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study used semi-continuous laboratory scale biogas reactors to simulate the effects of trace-element addition in different combinations, while degrading the organic fraction of municipal solid waste and slaughterhouse waste. The results show that the combined addition of Fe, Co and Ni was superior to the addition of only Fe, Fe and Co or Fe and Ni. However, the addition of only Fe resulted in a more stable process than the combined addition of Fe and Co, perhaps indicating a too efficient acidogenesis and/or homoacetogenesis in relation to a Ni-deprived methanogenic population. The results were observed in terms of higher biogas production (+9%), biogas production rates (+35%) and reduced VFA concentration for combined addition compared to only Fe and Ni. The higher stability was supported by observations of differences in viscosity, intraday WA-and biogas kinetics as well as by the 16S rRNA gene and 16S rRNA of the methanogens.(c) 2015 Elsevier Ltd. All rights reserved.

  • 13.
    Ziels, Ryan M.
    et al.
    University of Washington, WA 98195 USA.
    Beck, David A. C.
    University of Washington, WA 98195 USA; University of Washington, WA 98195 USA.
    Genero, Magalí Martí
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Gough, Heidi L.
    University of Washington, WA 98195 USA.
    Stensel, H. David
    University of Washington, WA 98195 USA.
    Svensson, Bo
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Monitoring the dynamics of syntrophic beta-oxidizing bacteria during anaerobic degradation of oleic acid by quantitative PCR2015Ingår i: FEMS Microbiology Ecology, ISSN 0168-6496, E-ISSN 1574-6941, Vol. 91, nr 4Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The ecophysiology of long-chain fatty acid-degrading syntrophic beta-oxidizing bacteria has been poorly understood due to a lack of quantitative abundance data. Here, TaqMan quantitative PCR (qPCR) assays targeting the 16S rRNA gene of the known mesophilic syntrophic beta-oxidizing bacterial genera Syntrophomonas and Syntrophus were developed and validated. Microbial community dynamics were followed using qPCR and Illumina-based high-throughput amplicon sequencing in triplicate methanogenic bioreactors subjected to five consecutive batch feedings of oleic acid. With repeated oleic acid feeding, the initial specific methane production rate significantly increased along with the relative abundances of Syntrophomonas and methanogenic archaea in the bioreactor communities. The novel qPCR assays showed that Syntrophomonas increased from 7 to 31% of the bacterial community 16S rRNA gene concentration, whereas that of Syntrophus decreased from 0.02 to less than 0.005%. High-throughput amplicon sequencing also revealed that Syntrophomonas became the dominant genus within the bioreactor microbiomes. These results suggest that increased specific mineralization rates of oleic acid were attributed to quantitative shifts within the microbial communities toward higher abundances of syntrophic beta-oxidizing bacteria and methanogenic archaea. The novel qPCR assays targeting syntrophic beta-oxidizing bacteria may thus serve as monitoring tools to indicate the fatty acid beta-oxidization potential of anaerobic digester communities.

  • 14.
    Generó, Magalí Martí
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Juottonen, Heli
    MEM-group, Department of Biosciences, University of Helsinki, Helsinki, Finland.
    Robroek, Bjorn J.M.
    Ecology and Biodiversity Group, Institute of Environmental Biology, Utrecht University, CH Utrecht, The Netherlands.
    Yrjälä, Kim
    MEM-group, Department of Biosciences, University of Helsinki, Helsinki, Finland.
    Danielsson, Åsa
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Lindgren, Per-Eric
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för mikrobiologi och molekylär medicin. Linköpings universitet, Hälsouniversitetet.
    Svensson, Bo
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Nitrogen and methanogen community composition within and among three Sphagnum dominated peatlands in Scandinavia2015Ingår i: Soil Biology and Biochemistry, ISSN 0038-0717, E-ISSN 1879-3428, Vol. 81, s. 204-211Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Ombrotrophic raised bogs are nutrient poor acidic peatlands accumulating organic matter. They are widely spread on northern latitudes and are substantial sources of methane emissions to the atmosphere being of great concern from a climate change perspective. We investigated the methanogen community composition along microtopographic gradients within three bogs in Scandinavia, receiving different amounts of nitrogen precipitation. Methanogenic community analyses by terminal restriction fragment length polymorphism of the mcrA gene showed different profiles among the three sites, while no in- fluence of the microtopographic gradients was observed. Peat temperature and dissolved organic carbon were the major edaphic variables explaining 38% of the variation of the methanogenic community di- versity among the bogs. The family Methanoregulaceae (hydrogenotrophic methanogens) showed the largest relative proportion and highest activity in all three sites. Quantitative PCR of the mcrA gene and transcripts showed that the most northern site, receiving the lowest atmospheric nitrogen load, had significantly lower abundance and activity of methanogens (4.7 106 and 2.4 104 mcrA copies per gram of soil, respectively), compared to the most southern site (8.2 107 and 4.6 105 mcrA copies per gram of soil, respectively), receiving the highest nitrogen load. No patterns of the mcrA gene and tran- script abundances were observed along the microtopography. The results indicated that the difference in occurrence of methanogens is mainly due to geoclimatological conditions rather than site intrinsic microtopographic variation. The study further suggests that environmental changes on the site intrinsic topography will not affect the methanogenic activity, while increasing average temperatures in Scan- dinavian ombrotrophic raised bogs might contribute to an increase of the methanogenic archaeal activity resulting in an increase of methane production. 

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  • 15.
    Robroek, Bjorn J. M.
    et al.
    University of Utrecht, Netherlands.
    Jasper Wubs, E.R.
    Netherlands Institute of Ecology (NIOO-KNAW), Netherlands .
    Generó, Magali Marti
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för mikrobiologi och molekylär medicin. Linköpings universitet, Hälsouniversitetet.
    Zajac, Katarzyna
    University of Bayreuth, Germany .
    Palsgaard Andersen, Jacob
    Aage V Jensen Naturfond, Denmark .
    Andersson, Arne
    Jönköping County Administrative Board (Länsstyrelsen, Sweden .
    Börjesson, Gunnar
    Swedish University of Agriculture Science, Uppsala, Sweden .
    Bragazza, Luca
    University of Ferrara, Italy .
    Dise, Nancy B.
    Manchester Metropolitan University, UK.
    Keuskamp, Joost A.
    University of Utrecht, Netherlands .
    Larsson, Madeleine
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
    Lindgren, Per-Eric
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för mikrobiologi och molekylär medicin. Linköpings universitet, Hälsouniversitetet.
    Mattiasson, Peter
    Jönköping County Administrative Board (Länsstyrelsen, Sweden .
    Salomonsson, Jane
    Linköpings universitet, Institutionen för tema. Linköpings universitet, Filosofiska fakulteten.
    Sundberg, Carina
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
    Svensson, Bo
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
    Verhoeyen, Jos T. A.
    University of Utrecht, Netherlands .
    Microclimatological consequences for plant and microbial composition in Sphagnum-dominated peatlands2014Ingår i: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 19, nr 3, s. 195-208Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In three Scandinavian peatlands we studied to what extent plant and microbial community compositions are governed by local-scale microhabitat, with a special interest in the effect of aspect (i.e. exposition of slopes). Despite differences in solar irradiance between the south- and north-facing slopes, maximum temperature was elevated in the south-facing slopes at the most northern site only. Pore-water nutrient concentrations were not affected by aspect, yet dissolved organic carbon concentrations were higher in the south-facing microhabitats. This was likely caused by higher vascular plant biomass. Plant and microbial community composition clearly differed among sites. In all three sites, microhabitat (i.e. prevailing water-table depth) affected the plant and microbial community compositions. Aspect, however, did not affect community composition, even though microclimate significantly differed between the south- and the north-facing aspects at the northernmost site. Our results highlight the complex link between plant community composition, microbial community and environmental conditions, which deserves much more attention than currently in order to fully understand the effects of climate change on peatland ecosystem function.

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