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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...

Université de Fribourg

Perception of soft mechanical stress in Arabidopsis leaves activates disease resistance

Benikhlef, Lehcen ; L’Haridon, Floriane ; Abou-Mansour, Eliane ; Serrano, Mario ; Binda, Matteo ; Costa, Alex ; Lehmann, Silke ; Métraux, Jean-Pierre

In: BMC Plant Biology, 2013, vol. 13, no. 1, p. 133

Background: in a previous study we have shown that wounding of Arabidopsis thaliana leaves induces a strong and transient immunity to Botrytis cinerea, the causal agent of grey mould. Reactive oxygen species (ROS) are formed within minutes after wounding and are required for wound–induced resistance to B. cinerea.Results: in this study, we have further explored ROS and resistance to B. cinerea...

Université de Fribourg

Pathogen and circadian controlled 1 (PCC1) regulates polar lipid content, ABA-related responses, and pathogen defence in Arabidopsis thaliana

Mir, Ricardo ; Hernández, M. Luisa ; Abou-Mansour, Eliane ; Martínez-Rivas, José Manuel ; Mauch, Félix ; Métraux, Jean-Pierre ; León, José

In: Journal of Experimental Botany, 2013, vol. 64, no. 11, p. 3385–3395

Pathogen and Circadian Controlled 1 (PCC1) was previously characterized as a regulator of defence against pathogens and stress-activated transition to flowering. Plants expressing an RNA interference construct for the PCC1 gene (iPCC1 plants) showed a pleiotropic phenotype. They were hypersensitive to abscisic acid (ABA) as shown by reduced germination potential and seedling establishment, as...

Université de Fribourg

export of salicylic acid from the chloroplast requires the multidrug and toxin extrusion-Like transporter EDS5

Serrano, Mario ; Wang, Bangjun ; Aryal, Bibek ; Garcion, Christophe ; Abou-Mansour, Eliane ; Heck, Silvia ; Geisler, Markus ; Mauch, Felix ; Nawrath, Christiane ; Métraux, Jean-Pierre

In: Plant Physiology, 2013, vol. 162, no. 4, p. 1815–1821

Salicylic acid (SA) is central for the defense of plants to pathogens and abiotic stress. SA is synthesized in chloroplasts from chorismic acid by an isochorismate synthase (ICS1); SA biosynthesis is negatively regulated by autoinhibitory feedback at ICS1. Genetic studies indicated that the multidrug and toxin extrusion transporter ENHANCED DISEASE SUSCEPTIBILITY5 (EDS5) of Arabidopsis...

Université de Fribourg

The glutaredoxin ATGRXS13 is required to facilitate Botrytis cinerea infection of Arabidopsis thaliana plants

Camera, Sylvain La ; L’Haridon, Floriane ; Astier, Jérémy ; Zander, Mark ; Abou-Mansour, Eliane ; Page, Gonzague ; Thurow, Corinna ; Wendehenne, David ; Gatz, Christiane ; Métraux, Jean-Pierre ; Lamotte, Olivier

In: The Plant Journal, 2011, vol. 68, no. 3, p. 507–519

Botrytis cinerea is a major pre- and post-harvest necrotrophic pathogen with a broad host range that causes substantial crop losses. The plant hormone jasmonic acid (JA) is involved in the basal resistance against this fungus. Despite basal resistance, virulent strains of B. cinerea can cause disease on Arabidopsis thaliana and virulent pathogens can interfere with the metabolism of the host in a...