Résumé
Polar regions are characterized by rocky terrains with sparse vegetation and oligotrophic soils, i.e. “fellfields”. In such ecosystems, microbial communities should be essential for soil-plant functioning but their diversity is poorly explored. The sub-Antarctic Kerguelen Islands fellfields are characterized by an endemic long-lived cushion plant, Lyallia kerguelensis which rhizosphere may be a shelter for microbes in this harsh environment. Cushions are affected by necrosis and we expect the rhizomicrobiome composition to be related to plant necrosis. We analysed bacterial and fungal communities in bulk- and rhizospheric soils from L. kerguelensis in five different fellfields across the Kerguelen Islands using 16S rRNA and ITS1 metabarcoding. We found that soil microbial communities were composed of both restricted and cosmopolitan taxa. While all sites were dominated by the same bacterial taxa (Chloroflexi, Actinobacteria, α-Proteobacteria and Acidobacteria), the relative abundance of the main fungal phyla (Ascomycota, Basidiomycota, Mortierellomycota and Rozellomycota) highly differed between sites. L. kerguelensis rhizomicrobiome was at least as diverse as the bulk soil, making the rhizosphere a possible reservoir of microbial diversity. It was composed of the same main bacterial phyla than detected in the bulk soil while the composition of the rhizosphere fungal communities was specific to each plant. No common microorganisms were identified regarding cushion necrosis extent across plants and sites, but several microbial putative functions were shared, suggesting a possible shift in soil functioning with cushion necrosis increase. Our study brings new information on the diversity and composition of the microbial communities of fellfield soils in a sub-Antarctic Island and the rhizomicrobiome of a characteristic endemic cushion plant.
Auteurs, date et publication :
Auteurs Lorène Julia Marchand , Françoise Hennion , Michèle Tarayre , Marie-Claire Martin , Benoit Renaud Martins , Cécile Monard
Publication : Frontiers in Soil Science
Date : 2025
Volume : 2
Catégorie(s)
#CNRS #EcoGenO #Université de RennesAuteurs, date et publication :
Auteurs Bertrand Guenet , Michael Danger , Loïc Harrault , Béatrice Allard , Marta Jauset-Alcala , Gérard Bardoux , Danielle Benest , Luc Abbadie , Gérard Lacroix
Publication : Hydrobiologia
Date : 2025
Volume : 721
Issue : 1
Pages : 35-44
Catégorie(s)
#CNRS #ENS #PLANAQUAAuteurs, date et publication :
Auteurs Marcus Schiedung , Severin-Luca Bellè , Samuel Abiven
Date : 2022
Catégorie(s)
#CNRS #Ecotron IleDeFrance #ENSAuteurs, date et publication :
Auteurs Thomas Bourguignon , JAN ŠobotnÍk , Gilles Lepoint , JEAN‐MICHEL MARTIN , Olivier J Hardy , Alain Dejean , Yves Roisin
Publication : Ecological Entomology
Date : 2025
Volume : 36
Issue : 2
Pages : 261-269
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Oliver Cartus , Maurizio Santoro
Publication : Remote Sensing of Environment
Date : 2025
Volume : 232
Pages : 111313
Catégorie(s)
#CNRS #FORET NouraguesRésumé
1. Multi-taxa diversity survey was done from DNA contained in 10 g soil samples.
2. DNA extraction protocols focusing on extracellular or total DNA were compared.
3. Few differences were observed between the two protocols.
4. The extracellular DNA extraction protocol was more time/cost effective.
5. It is appropriate for broad taxonomic and large-scale DNA-based surveys.
Auteurs, date et publication :
Auteurs Lucie Zinger , Jérôme Chave , Eric Coissac , Amaia Iribar , Eliane Louisanna , Sophie Manzi , Vincent Schilling , Heidy Schimann , Guilhem Sommeria-Klein , Pierre Taberlet
Publication : Soil Biology and Biochemistry
Date : 2025
Volume : 96
Pages : 16-19
Catégorie(s)
#ANR-Citation #CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Andrew Burt , Mathias Disney , Kim Calders
Publication : Methods in Ecology and Evolution
Date : 2025
Volume : 10
Issue : 3
Pages : 438-445
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Ceres Barros , Maya Guéguen , Rolland Douzet , Marta Carboni , Isabelle Boulangeat , Niklaus E. Zimmermann , Tamara Münkemüller , Wilfried Thuiller , Akira Mori
Publication : Journal of Applied Ecology
Date : 2025
Volume : 54
Issue : 1
Pages : 39-50
Catégorie(s)
#CNRS #Lautaret #UGARésumé
The role of Epigenetics in Epithelial Mesenchymal Transition (EMT) has recently emerged. Two epigenetic enzymes with paradoxical roles have previously been associated to EMT, EZH2 (Enhancer of Zeste 2 Polycomb Repressive Complex 2 (PRC2) Subunit), a lysine methyltranserase able to add the H3K27me3 mark, and the histone demethylase KDM6B (Lysine Demethylase 6B), which can remove the H3K27me3 mark. Nevertheless, it still remains unclear how these enzymes, with apparent opposite activities, could both promote EMT. In this study, we evaluated the function of these two enzymes using an EMT-inducible model, the lung cancer A549 cell line. ChIP-seq coupled with transcriptomic analysis showed that EZH2 and KDM6B were able to target and modulate the expression of different genes during EMT. Based on this analysis, we described INHBB, WTN5B, and ADAMTS6 as new EMT markers regulated by epigenetic modifications and directly implicated in EMT induction.
Auteurs, date et publication :
Auteurs Camille Lachat , Diane Bruyère , Amandine Etcheverry , Marc Aubry , Jean Mosser , Walid Warda , Michaël Herfs , Elodie Hendrick , Christophe Ferrand , Christophe Borg , Régis Delage-Mourroux , Jean-Paul Feugeas , Michaël Guittaut , Eric Hervouet , Paul Peixoto
Publication : Cancers
Date : 2020
Volume : 12
Issue : 12
Pages : 3649
Catégorie(s)
#CNRS #EcoGenO #Université de RennesAuteurs, date et publication :
Auteurs Ria Sonnleitner , Max Ringler , Matthias-Claudio Loretto , Eva Ringler
Publication : Biology Letters
Date : 2025
Volume : 16
Issue : 5
Pages : 20200094