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2 results on '"Alexandra Haouy"'

1. Fungal lipochitooligosaccharide symbiotic signals in arbuscular mycorrhiza

Author

Fabienne Maillet, Hugues Driguez, Véréna Poinsot, Guillaume Bécard, Andreas Niebel, Laurence Cromer, Damien Formey, Jean Dénarié, Olivier André, Virginie Puech-Pagès, Eduardo Andres Martinez, Delphine Giraudet, Monique Gueunier, Alexandra Haouy, inconnu, Inconnu, Centre de Recherches sur les Macromolécules Végétales (CERMAV), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Unité mixte de recherche interactions plantes-microorganismes, Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Evolution des Interactions Plantes-Microorganismes, Laboratoire de Recherche en Sciences Végétales (LRSV), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Metatoul - Agromix, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-MetaToul-MetaboHUB, Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Génopole Toulouse Midi-Pyrénées [Auzeville] (GENOTOUL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre de Recherches sur les Macromolécules Végétales, Centre National de la Recherche Scientifique (CNRS), EMD Crop BioScience, Charles-Leopold Mayer Prize, French Academy of Sciences, Institut National de la Recherche Agronomique, Carret, Michèle, Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Ecole Nationale Vétérinaire de Toulouse (ENVT)

Subjects
Lipopolysaccharides, EXTRACTS CHEMISTRY METABOLISM, 0106 biological sciences, ved/biology.organism_classification_rank.species, Plant Roots, 01 natural sciences, CHOMATOGRAPHY HIGH PRESSURE LIQUID, LIPOPOLYSACCHARIDES CHEMISTRY METABOLISM, Glomeromycota, Mycorrhizae, Mycorrhiza, Chromatography, High Pressure Liquid, ComputingMilieux_MISCELLANEOUS, 0303 health sciences, Multidisciplinary, Endosymbiosis, Ecology, SIGNAL TRANSDUCTION, SYMBIOSIS, food and beverages, SPORES FUNGAL CHEMISTRY METABOLISM SYMBIOSIS, Spores, Fungal, GLOMEROMYCOTA METABOLISM, MEDICAGO TRUNCATULA CHEMISTRY GROWTH & DEVELOPMENT METABOLISM MICROBIOLOBY, Medicago truncatula, Daucus carota, Arbuscular mycorrhiza, MYCORRHIZAE METABOLISM, PLANT ROOTS CHEMISTRY GROWTH & DEVELOPMENT METABOLISM MICROBIOLOGY, CARBOHYDRATE SEQUENCE, CAROTA CHEMISTRY METABOLISM MICROBIOLOGY, [SDV.BC]Life Sciences [q-bio]/Cellular Biology, Biology, 03 medical and health sciences, Symbiosis, Terrestrial plant, Botany, MOLECULAR SEQUENCE DATA, PLANT, 030304 developmental biology, Plant Extracts, ved/biology, fungi, Fabaceae, 15. Life on land, biology.organism_classification, DAUCUS, AM, SUSTAINABLE DEVELOPMENT, 010606 plant biology & botany
Abstract

International audience; Arbuscular mycorrhiza (AM) is a root endosymbiosis between plants and glomeromycete fungi. It is the most widespread terrestrial plant symbiosis, improving plant uptake of water and mineral nutrients. Yet, despite its crucial role in land ecosystems, molecular mechanisms leading to its formation are just beginning to be unravelled. Recent evidence suggests that AM fungi produce diffusible symbiotic signals. Here we show that Glomus intraradices secretes symbiotic signals that are a mixture of sulphated and non-sulphated simple lipochitooligosaccharides (LCOs), which stimulate formation of AM in plant species of diverse families (Fabaceae, Asteraceae and Umbelliferae). In the legume Medicago truncatula these signals stimulate root growth and branching by the symbiotic DMI signalling pathway. These findings provide a better understanding of the evolution of signalling mechanisms involved in plant root endosymbioses and will greatly facilitate their molecular dissection. They also open the way to using these natural and very active molecules in agriculture.

Published
2011
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2. Comparative analysis of mitochondrial genomes of Rhizophagus irregularis – syn. Glomus irregulare – reveals a polymorphism induced by variability generating elements

Author

Bruno Savelli, Olivier Bouchez, Marion Molès, Guillaume Bécard, Alexandra Haouy, Damien Formey, Christophe Roux, Laboratoire de Recherche en Sciences Végétales (LRSV), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Agronutrition, Laboratoire de Génétique Cellulaire (LGC), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Interactions Microbiennes dans la Rhizosphère et les Racines, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), and This work was performed in the LRSV laboratory, which is part of the TULIP ‘Laboratoire d'Excellence (LABEX) (ANR-10-LABX-41)’.

Subjects
0106 biological sciences, Rhizophagus irregularis, Physiology, Sequence analysis, [SDV]Life Sciences [q-bio], Population, DNA-Directed DNA Polymerase, Plant Science, Biology, Polymorphism, Single Nucleotide, 01 natural sciences, Genome, DNA sequencing, endonuclease, rhizophagus irregularis, Open Reading Frames, 03 medical and health sciences, Intergenic region, Mycorrhizae, Glomeromycota, education, Genome size, dna polymerase, intraspecific variability, Phylogeny, 030304 developmental biology, Genetics, 0303 health sciences, education.field_of_study, inverted repeat, Inverted Repeat Sequences, snp, Sequence Analysis, DNA, biology.organism_classification, genomic DNA, mitochondrial genome, Genome, Mitochondrial, Microsatellite Repeats, 010606 plant biology & botany
Abstract

Chantier qualité GA; International audience; Arbuscular mycorrhizal (AM) fungi are involved in one of the most widespread plant–fungus interactions. A number of studies on the population dynamics of AM fungi have used mitochondrial (mt) DNA sequences, and yet mt AM fungus genomes are poorly known. To date, four mt genomes of three species of AM fungi are available, among which are two from Rhizophagus irregularis. In order to study intra- and interstrain mt genome variability of R. irregularis, we sequenced and de novo assembled four additional mt genomes of this species. We used 454 pyrosequencing and Illumina technologies to directly sequence mt genomes from total genomic DNA.The mt genomes are unique within each strain. Interstrain divergences in genome size, as a result of highly polymorphic intergenic and intronic sequences, were observed. The polymorphism is brought about by three types of variability generating element (VGE): homing endonucleases, DNA polymerase domain-containing open reading frames and small inverted repeats. Based on VGE positioning, mt sequences and nuclear markers, two subclades of R. irregularis were characterized. The discovery of VGEs highlights the great intraspecific plasticity of the R. irregularis mt genome. VGEs allow the design of powerful mt markers for the typing and monitoring of R. irregularis strains in genetic and population studies.

Published
2012
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