Auteurs, date et publication :
Auteurs Hélcio R Gil-Santana , Jader Oliveira , Jean-Michel Bérenger
Publication : ZooKeys
Date : 2025
Volume : 968
Pages : 85
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Plants are colonized by a great diversity of microorganisms which form a microbiota and perform additional functions for their host. This microbiota can thus be considered a toolbox enabling plants to buffer local environmental changes, with a positive influence on plant fitness. In this context, the transmission of the microbiota to the progeny represent a way to ensure the presence of beneficial symbionts within the habitat. Examples of such transmission have been mainly described for seed transmission and concern a few pathogenic microorganisms. We investigated the transmission of symbiotic partners to plant progeny within clonal plant network.
Auteurs, date et publication :
Auteurs Nathan Vannier , Cendrine Mony , Anne-Kristel Bittebiere , Sophie Michon-Coudouel , Marine Biget , Philippe Vandenkoornhuyse
Publication : Microbiome
Date : 2018
Volume : 6
Issue : 1
Pages : 79
Catégorie(s)
#CNRS #EcoGenO #Université de RennesRésumé
Methods: Our approach gradually constrains null models by: (1) filtering out species not able to survive in the regional conditions in order to reduce the spatial scale, and (2) shuffling species only within lineages of different ages to reduce the evolutionary scale of the analysis. We first tested and validated this approach using simulated communities. We then applied it to study the functional diversity patterns of the leaf–height–seed strategy of plant communities in the French Alps.
Results: Using simulations, we found that reducing the spatial scale correctly detected a signature of competition (functional divergence) even when environmental filtering produced an overlaying signal of functional convergence. However, constraining the evolutionary scale did not change the identified functional diversity patterns. In the case study of alpine plant communities, investigating scale effects revealed that environmental filtering had a strong influence at larger spatial and evolutionary scales and that neutral processes were more important at smaller scales. In contrast to the simulation study results, decreasing the evolutionary scale tended to increase patterns of functional divergence.
Conclusion: We argue that the traditional null model approach can only identify a single main process at a time and suggest to rather use a family of null models to disentangle intertwined assembly processes acting across spatial and evolutionary scales.
Auteurs, date et publication :
Auteurs L. Chalmandrier , T. Münkemüller , L. Gallien , F. de Bello , F. Mazel , S. Lavergne , W. Thuiller , Rasmus Ejrnaes
Publication : Journal of Vegetation Science
Date : 2025
Volume : 24
Issue : 5
Pages : 853-864
Catégorie(s)
#CNRS #Lautaret #UGAAuteurs, date et publication :
Auteurs Fabio Leonardo Meza Joya , Eliana Ramos Pallares , Carlos Andres Hernandez Jaimes
Publication : Herpetology Notes
Date : 2025
Volume : 12
Pages : 391-400
Catégorie(s)
#⛔ No DOI found #CNRS #FORET NouraguesRésumé
Aims DNA methylation has been found to regulate microRNAs (miRNAs) expression, but the prognostic value of miRNA-related DNA methylation aberration remained largely elusive in cancers including glioblastomas (GBMs). This study aimed to investigate the clinical and biological feature of miRNA methylation in GBMs of non-glioma-CpG island methylator phenotype (non-G-CIMP). Methods Prognostic miRNA methylation loci were analyzed, with TCGA and Rennes cohort as training sets, and independent datasets of GBMs and low-grade gliomas (LGGs) were obtained as validation sets. Different statistical and bioinformatic analysis and experimental validations were performed to clinically and biologically characterize the signature. Results We identified and validated a risk score based on methylation status of five miRNA-associated CpGs which could predict survival of GBM patients in a series of training and validation sets. This signature was independent of age and O-6-methylguanine-DNA methyltransferase (MGMT) promoter methylation status. The risk subgroup was associated with angiogenesis and accordingly differential responses to bevacizumab-contained therapy. MiRNA target analysis and in vitro experiments further confirmed the accuracy of this signature. Conclusion The five-CpG signature of miRNA methylation was biologically relevant and was of potential prognostic and predictive value for GBMs. It might be of help for improving individualized treatment.
Auteurs, date et publication :
Auteurs En-Ming Kang , An-An Yin , Ya-Long He , Wei-Jun Chen , Amandine Etcheverry , Marc Aubry , Jill Barnholtz‐Sloan , Jean Mosser , Wei Zhang , Xiang Zhang
Publication : CNS Neuroscience & Therapeutics
Date : 2025
Volume : 25
Issue : 9
Pages : 937-950
Catégorie(s)
#CNRS #EcoGenO #Université de RennesRésumé
A 1000-cow study across four European countries was undertaken to understand to what extent ruminant microbiomes can be controlled by the host animal and to identify characteristics of the host rumen microbiome axis that determine productivity and methane emissions. A core rumen microbiome, phylogenetically linked and with a preserved hierarchical structure, was identified. A 39-member subset of the core formed hubs in co-occurrence networks linking microbiome structure to host genetics and phenotype (methane emissions, rumen and blood metabolites, and milk production efficiency). These phenotypes can be predicted from the core microbiome using machine learning algorithms. The heritable core microbes, therefore, present primary targets for rumen manipulation toward sustainable and environmentally friendly agriculture.
Cow genes dictate environmentally friendly microbiomes: a step towards reducing greenhouse gas emissions.
Cow genes dictate environmentally friendly microbiomes: a step towards reducing greenhouse gas emissions.
Auteurs, date et publication :
Auteurs R. John Wallace , Goor Sasson , Philip C. Garnsworthy , Ilma Tapio , Emma Gregson , Paolo Bani , Pekka Huhtanen , Ali R. Bayat , Francesco Strozzi , Filippo Biscarini , Timothy J. Snelling , Neil Saunders , Sarah L. Potterton , James Craigon , Andrea Minuti , Erminio Trevisi , Maria L. Callegari , Fiorenzo Piccioli Cappelli , Edward H. Cabezas-Garcia , Johanna Vilkki
Publication : Science Advances
Date : 2019
Volume : 5
Issue : 7
Pages : eaav8391
Catégorie(s)
#CNRS #eDNARésumé
The induction of general plant defense responses following the perception of external elicitors is now regarded as the first level of the plant immune response. Depending on the involvement or not of these molecules in pathogenicity, this induction of defense is called either Pathogen-Associated Molecular Pattern (PAMP) Triggered Immunity or Pattern Triggered Immunity—both abbreviated to PTI. Because PTI is assumed to be a widespread and stable form of resistance to infection, understanding the mechanisms driving it becomes a major goal for the sustainable management of plant-pathogen interactions. However, the induction of PTI is complex. Our hypotheses are that (i) the recognition by the plant of PAMPs vs non-PAMP elicitors leads to specific defense profiles and (ii) the responses specifically induced by PAMPs target critical life history traits of the pathogen that produced them. We thus analyzed, using a metabolomic approach coupled with transcriptomic and hormonal analyses, the defense profiles induced in potato foliage treated with either a Concentrated Culture Filtrate (CCF) from Phytophthora infestans or two non-PAMP preparations, β-aminobutyric acid (BABA) and an Ulva spp. Extract, used separately. Each elicitor induced specific defense profiles. CCF up-regulated sesquiterpenes but down-regulated sterols and phenols, notably α-chaconine, caffeoyl quinic acid and rutin, which decreased spore production of P. infestans in vitro. CCF thus induces both defense and counter-defense responses. By contrast, the Ulva extract triggered the synthesis of a large-spectrum of antimicrobial compounds through the phenylpropanoid/flavonoid pathways, while BABA targeted the primary metabolism. Hence, PTI can be regarded as a heterogeneous set of general and pathogen-specific responses triggered by the molecular signatures of each elicitor, rather than as a uniform, non-specific and broad-spectrum set of general defense reactions.
Auteurs, date et publication :
Auteurs Rafaela Lopes Martin , Pauline Le Boulch , Pauline Clin , Adrián Schwarzenberg , Jean-Claude Yvin , Didier Andrivon , Eric Nguema-Ona , Florence Val
Publication : PLOS ONE
Date : 2025
Volume : 15
Issue : 8
Pages : e0236633
Catégorie(s)
#CNRS #EcoGenO #Université de RennesRésumé
The infrastructure for Analysis and Experimentation on Ecosystems (AnaEE-France) is an integrated network of the major French experimental, analytical, and modeling platforms dedicated to the biological study of continental ecosystems (aquatic and terrestrial). This infrastructure aims at understanding and predicting ecosystem dynamics under global change. AnaEE-France comprises complementary nodes offering access to the best experimental facilities and associated biological resources and data: Ecotrons, seminatural experimental platforms to manipulate terrestrial and aquatic ecosystems, in natura sites equipped for large-scale and long-term experiments. AnaEE-France also provides shared instruments and analytical platforms dedicated to environmental (micro) biology. Finally, AnaEE-France provides users with data bases and modeling tools designed to represent ecosystem dynamics and to go further in coupling ecological, agronomical, and evolutionary approaches. In particular, AnaEE-France offers adequate services to tackle the new challenges of research in ecotoxicology, positioning its various types of platforms in an ecologically advanced ecotoxicology approach. AnaEE-France is a leading international infrastructure, and it is pioneering the construction of AnaEE (Europe) infrastructure in the field of ecosystem research. AnaEE-France infrastructure is already open to the international community of scientists in the field of continental ecotoxicology.
Auteurs, date et publication :
Auteurs Christian Mougin , Didier Azam , Thierry Caquet , Nathalie Cheviron , Samuel Dequiedt , Jean-François Le Galliard , Olivier Guillaume , Sabine Houot , Gérard Lacroix , François Lafolie , Pierre-Alain Maron , Radika Michniewicz , Christian Pichot , Lionel Ranjard , Jacques Roy , Bernd Zeller , Jean Clobert , André Chanzy
Publication : Environmental Science and Pollution Research
Date : 2015
Volume : 22
Issue : 20
Pages : 16215-16228
Catégorie(s)
#ANR-Citation #BiochemEnv #CNRS #Coordination AnaEERésumé
Cushion plants have long fascinated botanists for their ability to cope with extreme environments in most mountains and arctic regions of the world. One century ago, a first worldwide catalogue of species forming cushions was published by Hauri and Schröter (Bot Jahrb Syst Pflanzengesch Pflanzengeogr 50:618–656, 1914). Here, we defined a simplified typology of cushion plants and updated the worldwide catalogue of cushion species, along with information on their geographic distribution. This compilation was based on available information in floras and catalogues but also in efloras and virtual encyclopedias, which were screened using automated database queries. We established a list of 1,309 cushion-forming species distributed in 272 genera and 63 families of angiosperms. Compact cushions are represented by 678 species, among which 587 species exhibit a hemispherical shape, and 91 species exhibit a flat to mat shape. We found 398 species forming non-compact hemispherical cushions. The list of cushion species has significantly increased since Hauri and Shröter, due to the description of new species, updated regional inventories, and improved access to electronic databases. Uncertainties in the delineation of the cushion life form are discussed, notably for non-compact growth forms. A website has been launched to display the catalogue and enable a collaborative improvement of the database (http://www.cushionplants.eu/). The distribution of the species is presented on the basis of the world geographical scheme for recording plant distributions and global biodiversity information facility data. This catalogue will serve as a reference database for further analyses on the biogeography and evolutionary history of cushion plants and arctico-alpine biotas.
Auteurs, date et publication :
Auteurs Serge Aubert , Florian Boucher , Sébastien Lavergne , Julien Renaud , Philippe Choler
Publication : Alpine Botany
Date : 2014
Volume : 124
Issue : 1
Pages : 59-70
Catégorie(s)
#CNRS #Lautaret #UGARésumé
Continental-scale assessments of 21st century global impacts of climate change on biodiversity have forecasted range contractions for many species. These coarse resolution studies are, however, of limited relevance for projecting risks to biodiversity in mountain systems, where pronounced microclimatic variation could allow species to persist locally, and are ill-suited for assessment of species-specific threat in particular regions. Here, we assess the impacts of climate change on 2632 plant species across all major European mountain ranges, using high-resolution (ca. 100 m) species samples and data expressing four future climate scenarios. Projected habitat loss is greater for species distributed at higher elevations; depending on the climate scenario, we find 36–55% of alpine species, 31–51% of subalpine species and 19–46% of montane species lose more than 80% of their suitable habitat by 2070–2100. While our high-resolution analyses consistently indicate marked levels of threat to cold-adapted mountain florae across Europe, they also reveal unequal distribution of this threat across the various mountain ranges. Impacts on florae from regions projected to undergo increased warming accompanied by decreased precipitation, such as the Pyrenees and the Eastern Austrian Alps, will likely be greater than on florae in regions where the increase in temperature is less pronounced and rainfall increases concomitantly, such as in the Norwegian Scandes and the Scottish Highlands. This suggests that change in precipitation, not only warming, plays an important role in determining the potential impacts of climate change on vegetation.
Auteurs, date et publication :
Auteurs Robin Engler , Christophe F. Randin , Wilfried Thuiller , Stefan Dullinger , Niklaus E. Zimmermann , Miguel B. Araújo , Peter B. Pearman , Gwenaëlle Le Lay , Christian Piedallu , Cécile H. Albert , Philippe Choler , Gheorghe Coldea , Xavier De LAMO , Thomas Dirnböck , Jean-Claude Gégout , Daniel Gómez-García , John-Arvid Grytnes , Einar Heegaard , Fride Høistad , David Nogués-Bravo
Publication : Global Change Biology
Date : 2025
Volume : 17
Issue : 7
Pages : 2330-2341