LAROUSSE , Marie

Les oomycètes phytopathogènes ont co-évolué avec les microbiotes des plantes hôtes. Il en résulte la formation de biofilms et des réseaux complexes d'interactions dont nous commençons juste à comprendre l'incidence sur la biologie et la virulence des oomycètes. Déterminer la nature de ces interactions et leur rôle dans le contexte d'une...

Microbial Partnerships of Pathogenic Oomycetes

To explore moist soils and to target host plants, phytopathogenic Phytophthora species utilize the sensory and propulsion capabilities of the biflagellate unicellular zoospores they produce. Zoospore motion and interactions with the microenvironment are of primary importance for Phytophthora physiology. These are also of critical significance...

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Background: Interactions between pathogenic oomycetes and microbiota residing on the surface of the host plant root are unknown, despite being critical to inoculum constitution. The nature of these interactions was explored for the polyphagous and telluric species Phytophthora parasitica. Results: Composition of the rhizospheric microbiota of...

Les systèmes racinaires des arbres sont colonisés par des communautés microbiennes complexes essentiellement composées de bactéries et de champignons. Ces microorganismes participent à la nutrition et à la croissance des arbres ainsi qu'à leur résistance aux stress biotiques et abiotiques. Si les mécanismes moléculaires régulant la colonisation...

The plant pathogen Phytophthora parasitica forms a biofilm on the host surface. The biofilm transcriptome is characterized by the expression of PPMUCL1/2/3 (PHYTOPHTHORA PARASITICA MUCIN-LIKE) genes, which we report here to be members of a new, large mucin-like gene family restricted to the oomycete lineage. These genes encode secreted proteins...

Legumes associate with rhizobia to form nitrogen (N2)-fixing nodules, which is important for plant fitness [1, 2]. Medicago truncatula controls the terminal differentiation of Sinorhizobium meliloti into N2-fixing bacteroids by producing defensin-like nodule-specific cysteine-rich peptides (NCRs) [3, 4]. The redox state of NCRs influences some...