List of publications

The xylan utilization system of the plant pathogen Xanthomonas campestris pv campestris controls epiphytic life and reveals common features with oligotrophic bacteria and animal gut symbionts

02/27/2013 00:00
Déjean G, Blanvillain-Baufumé S, Boulanger A, Darrasse A, Dugé de Bernonville T, Girard AL, Carrére S, Jamet S, Zischek C, Lautier M, Solé M, Büttner D, Jacques MA, Lauber E, Arlat M.   Abstract: Xylan is a major structural component of plant cell wall and the second most abundant plant polysaccharide in nature. Here, by combining genomic and functional analyses, we provide a comprehensive picture of xylan utilization by Xanthomonas campestris pv campestris (Xcc) and highlight its...

Thiamine modulates metabolism of the phenylpropanoid pathway leading to enhanced resistance to Plasmopara viticola in grapevine

02/26/2013 00:00
Hatem Boubakri, Anne Poutaraud, Mohamed Ali Wahab, Celine Clayeux, Raymonde Baltenweck-Guyot, Damien Steyer, Christophe Marcic, Ahmed Mliki and Isabelle Soustre-Gacougnolle   Abstract: Background Previously, we have reported the ability of thiamine (vitamin B1) to induce resistance against Plasmopara viticola in a susceptible grapevine cv. Chardonnay. However, mechanisms underlying vitamins, especially, thiamine-induced disease resistance in grapevine are still largely unknown. Here, we...

NFP, a LysM protein controlling Nod factor perception, also intervenes in Medicago truncatula resistance to pathogens

02/25/2013 00:00
Thomas Rey, Amaury Nars, Maxime Bonhomme, Arnaud Bottin, Stéphanie Huguet, Sandrine Balzergue, Marie-Françoise Jardinaud, Jean-Jacques Bono, Julie Cullimore, Bernard Dumas, Clare Gough and Christophe Jacquet   Abstract: Plant LysM proteins control the perception of microbial-derived N-acetylglucosamine compounds for the establishment of symbiosis or activation of plant immunity. This raises questions about how plants, and notably legumes, can differentiate friends and foes using...

Mise en évidence et caractérisation d'interconnexions moléculaires entre symbiose et résistance chez la légumineuse modèle Medicago truncatula

02/20/2013 00:00
Rey Thomas   Abstract: La rhizosphère, définie comme l'espace du sol qui entoure les racines, héberge de nombreux microorganismes à l'origine d'une grande variété d'interactions avec la plante. Au cours des dix dernières années, un grand nombre de gènes végétaux impliqués dans le dialogue moléculaire qui s'établit dans le cadre des différentes symbioses ou lors de la réponse de la plante aux parasites ont été identifiés. Les résultats de ces travaux ont notamment révélé l'existence de...

Regulation and functions of ERF ERN transcription factors during root nodule symbiosis between Medicago truncatula and Sinorhizobium meliloti

02/20/2013 00:00
Marion Cerri   Abstract: Legumes are able to associate in symbiosis with Rhizobia bacteria in the soil, which culminates in the formation of a new organ referred to as the root nodule, within which differentiated bacteria fix nitrogen to the benefit of the host plant. The establishment of this association relies on a molecular dialogue between the two partners, involving bacterial lipo-chitooligosaccharide signals called Nod factors (NF). In the model legume Medicago truncatula, the...

Structural characterization and perception by the host plant Medicago truncatula of the cell wall chitosaccharides of the legume parasite Aphanomyces euteiches

02/19/2013 00:00
Amaury Nars   Abstract: The oomycete Aphanomyces euteiches is a root pathogen infecting legumes which causes important yield losses. The cell wall of A.euteiches contains 10% N-acetylglucosamine (NAG) in the form of non-crystalline chitosaccharides, which are associated to cell wall glucans. To study their biological activity, a root elicitation bioassay on the host plant Medicago truncatula has been set up using a preparation of chitin fragments as a control elicitor. The purification of...

Arabidopsis ubiquitin ligase MIEL1 mediates degradation of the transcription factor MYB30 weakening plant defence

02/12/2013 00:00
Daniel Marino, Solène Froidure, Joanne Canonne, Sara Ben Khaled, Mehdi Khafif, Cécile Pouzet, Alain Jauneau, Dominique Roby & Susana Rivas   Abstract: One of the most efficient plant resistance reactions to pathogen attack is the hypersensitive response, a form of programmed cell death at infection sites. The Arabidopsis transcription factor MYB30 is a positive regulator of hypersensitive cell death responses. Here we show that MIEL1 (MYB30-Interacting E3 Ligase1), an Arabidopsis...

Extensive contemporary pollen-mediated gene flow in two herb species, Ranunculus bulbosus and Trifolium montanum, along an altitudinal gradient in a meadow landscape

02/12/2013 00:00
Matter P, Kettle CJ, Ghazoul J, Pluess AR   Abstract: Background and Aims Genetic connectivity between plant populations allows for exchange and dispersal of adaptive genes, which can facilitate plant population persistence particularly in rapidly changing environments. Methods Patterns of historic gene flow, flowering phenology and contemporary pollen flow were investigated in two common herbs, Ranunculus bulbosus and Trifolium montanum, along an altitudinal gradient of 1200–1800 m...

Short-chain chitin oligomers from arbuscular mycorrhizal fungi trigger nuclear Ca2+ spiking in Medicago truncatula roots and their production is enhanced by strigolactone

02/06/2013 00:00
Andrea Genre, Mireille Chabaud, Coline Balzergue, Virginie Puech-Pagès, Mara Novero, Thomas Rey, Joëlle Fournier, Soizic Rochange, Guillaume Bécard, Paola Bonfante and David G. Barker   Abstract: The primary objective of this study was to identify the molecular signals present in arbuscular mycorrhizal (AM) germinated spore exudates (GSEs) responsible for activating nuclear Ca2+ spiking in the Medicago truncatula root epidermis. Medicago truncatula root organ cultures (ROCs)...

Dynamics and biological relevance of DNA demethylation in Arabidopsis antibacterial defense

02/05/2013 00:00
Agnès Yu, Gersende Lepère, Florence Jay, Jingyu Wang, Laure Bapaume, Yu Wang, Anne-Laure Abraham, Jon Penterman, Robert L. Fischer, Olivier Voinnet and Lionel Navarro   Abstract: DNA methylation is an epigenetic mark that silences transposable elements (TEs) and repeats. Whereas the establishment and maintenance of DNA methylation are relatively well understood, little is known about their dynamics and biological relevance in plant and animal innate immunity. Here, we show that some TEs...
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