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Université de Fribourg

The cuticle mutant eca2 modifies plant defense responses to biotrophic and necrotrophic pathogens and herbivory insects

Blanc, Catherine ; Coluccia, Fania ; L?Haridon, Floriane ; Torres, Martha ; Ortiz-Berrocal, Marlene ; Stahl, Elia ; Reymond, Philippe ; Schreiber, Lukas ; Nawrath, Christiane ; Métraux, Jean-Pierre ; Serrano, Mario

In: Molecular Plant-Microbe Interactions, 2017, vol. 31, no. 3, p. 344–355

We isolated previously several Arabidopsis thaliana mutants with constitutive expression of the early microbe-associated molecular pattern–induced gene ATL2, named eca (expresión constitutiva de ATL2). Here, we further explored the interaction of eca mutants with pest and pathogens. Of all eca mutants, eca2 was more resistant to a fungal pathogen (Botrytis cinerea) and a bacterial pathogen...

Université de Fribourg

In roots of Arabidopsis thaliana, the damage-associated molecular pattern AtPep1 is a stronger elicitor of immune signalling than flg22 or the chitin heptamer

Poncini, Lorenzo ; Wyrsch, Ines ; Tendon, Valérie Dénervaud ; Vorley, Thomas ; Boller, Thomas ; Geldner, Niko ; Métraux, Jean-Pierre ; Lehmann, Silke

In: PLOS ONE, 2017, vol. 12, no. 10, p. e0185808

Plants interpret their immediate environment through perception of small molecules. Microbe-associated molecular patterns (MAMPs) such as flagellin and chitin are likely to be more abundant in the rhizosphere than plant-derived damage-associated molecular patterns (DAMPs). We investigated how the Arabidopsis thaliana root interprets MAMPs and DAMPs as danger signals. We monitored root...

Université de Fribourg

The innate immune signaling system as a regulator of disease resistance and induced systemic resistance activity against Verticillium dahliae

Gkizi, Danai ; Lehmann, Silke ; L’Haridon, Floriane ; Serrano, Mario ; Paplomatas, Epaminondas J. ; Métraux, Jean-Pierre ; Tjamos, Sotirios E.

In: Molecular Plant-Microbe Interactions, 2016, vol. 29, no. 4, p. 313–323

In the last decades, the plant innate immune responses against pathogens have been extensively studied, while biocontrol interactions between soilborne fungal pathogens and their hosts have received much less attention. Treatment of Arabidopsis thaliana with the nonpathogenic bacterium Paenibacillus alvei K165 was shown previously to protect against Verticillium dahliae by triggering induced...

Université de Fribourg

The novel elicitor AsES triggers a defense response against Botrytis cinerea in Arabidopsis thaliana

Hael-Conrad, V. ; Abou-Mansour, Eliane ; Díaz-Ricci, J.-C. ; Métraux, Jean-Pierre ; Serrano, Mario

In: Plant Science, 2015, vol. 241, p. 120–127

AsES (Acremonium strictum Elicitor and Subtilisin) is a novel extracellular elicitor protein produced by the avirulent isolate SS71 of the opportunist strawberry fungal pathogen A. strictum. Here we describe the activity of AsES in the plant-pathogen system Arabidopsis thaliana–Botrytis cinerea. We show that AsES renders A. thaliana plants resistant to the necrotrophic pathogen B. cinerea, both...

Université de Fribourg

The microbiome of the leaf surface of Arabidopsis protects against a fungal pathogen

Ritpitakphong, Unyarat ; Falquet, Laurent ; Vimoltust, Artit ; Berger, Antoine ; Métraux, Jean-Pierre ; L'Haridon, Floriane

In: New Phytologist, 2016, p. -

We have explored the importance of the phyllosphere microbiome in plant resistance in the cuticle mutants bdg (BODYGUARD) or lacs2.3 (LONG CHAIN FATTY ACID SYNTHASE 2) that are strongly resistant to the fungal pathogen Botrytis cinerea. The study includes infection of plants under sterile conditions, 16S ribosomal DNA sequencing of the phyllosphere microbiome, and isolation and high coverage...

Université de Fribourg

Localization and expression of EDS5H a homologue of the SA transporter EDS5

Parinthawong, Nonglak ; Cottier, Stéphanie ; Buchala, Antony ; Nawrath, Christiane ; Métraux, Jean-Pierre

In: BMC Plant Biology, 2015, vol. 15, no. 1, p. 135

An important signal transduction pathway in plant defence depends on the accumulation of salicylic acid (SA). SA is produced in chloroplasts and the multidrug and toxin extrusion transporter ENHANCED DISEASE SUSCEPTIBILITY5 (EDS5; At4g39030) is necessary for the accumulation of SA after pathogen and abiotic stress. EDS5 is localized at the chloroplast and functions in transporting SA from the...

Université de Fribourg

Production of reactive oxygen species and wound-induced resistance in Arabidopsis thaliana against Botrytis cinerea are preceded and depend on a burst of calcium

Beneloujaephajri, Emna ; Costa, Alex ; L’Haridon, Floriane ; Métraux, Jean-Pierre ; Binda, Matteo

In: BMC Plant Biology, 2013, vol. 13, no. 1, p. 160

Background: Wounded leaves of Arabidopsis thaliana produce reactive oxygen species (ROS) within minutes after wounding and become resistant to the pathogenic fungus Botrytis cinerea at a local level. This fast response of the plants to the wound is called wound-induced resistance (WIR). However the molecular mechanisms of this response and the signal cascade between the wound and ROS production...