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Imbalanced Lignin Biosynthesis Promotes the Sexual Reproduction of Homothallic Oomycete Pathogens

Quentin, Michaël; Allasia, Valérie; Pegard, Anthony; Allais, Florent; Ducrot, Paul-Henri; Favery, Bruno; Levis, Caroline; Martinet, Sophie; Masur, Clarissa; Ponchet, Michel; Roby, Dominique; Schlaich, Nikolaus L.; Jouanin, Lise; Keller, Harald
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
EN
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16.32%
Lignin is incorporated into plant cell walls to maintain plant architecture and to ensure long-distance water transport. Lignin composition affects the industrial value of plant material for forage, wood and paper production, and biofuel technologies. Industrial demands have resulted in an increase in the use of genetic engineering to modify lignified plant cell wall composition. However, the interaction of the resulting plants with the environment must be analyzed carefully to ensure that there are no undesirable side effects of lignin modification. We show here that Arabidopsis thaliana mutants with impaired 5-hydroxyguaiacyl O-methyltransferase (known as caffeate O-methyltransferase; COMT) function were more susceptible to various bacterial and fungal pathogens. Unexpectedly, asexual sporulation of the downy mildew pathogen, Hyaloperonospora arabidopsidis, was impaired on these mutants. Enhanced resistance to downy mildew was not correlated with increased plant defense responses in comt1 mutants but coincided with a higher frequency of oomycete sexual reproduction within mutant tissues. Comt1 mutants but not wild-type Arabidopsis accumulated soluble 2-O-5-hydroxyferuloyl-l-malate. The compound weakened mycelium vigor and promoted sexual oomycete reproduction when applied to a homothallic oomycete in vitro. These findings suggested that the accumulation of 2-O-5-hydroxyferuloyl-l-malate accounted for the observed comt1 mutant phenotypes during the interaction with H. arabidopsidis. Taken together...

Transcriptomic analysis of Arabidopsis developing stems: a close-up on cell wall genes

Minic, Zoran; Jamet, Elisabeth; San-Clemente, Hélène; Pelletier, Sandra; Renou, Jean-Pierre; Rihouey, Christophe; Okinyo, Denis PO; Proux, Caroline; Lerouge, Patrice; Jouanin, Lise
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
Publicado em 16/01/2009 EN
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Visita Universidad de Rennes

Escuela Internacional de Ciencias Económicas y Administrativas
Fonte: Universidade La Sabana Publicador: Universidade La Sabana
Tipo: Imagem
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Fotografía de Caroline Jouanin, Coordinadora de Admisiones de ESC Rennes junto a estudiantes de la Escuela Internacional de Ciencias Económicas y Administrativas.