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Université de Fribourg

The ABC transporter BcatrB from Botrytis cinerea exports camalexin and is a virulence factor on Arabidopsis thaliana

Stefanato, Francesca L. ; Abou-Mansour, Eliane ; Buchala, Antony ; Kretschmer, Matthias ; Mosbach, Andreas ; Hahn, Matthias ; Bochet, Christian G. ; Métraux, Jean-Pierre ; Schoonbeek, Henk-jan

In: The Plant Journal, 2009///doi: 10.1111/j.1365-313X.2009.03794.x

Arabidopsis thaliana is known to produce the phytoalexin camalexin in response to abiotic and biotic stress. Here we studied the mechanisms of tolerance to camalexin in the fungus Botrytis cinerea, a necrotrophic pathogen of A. thaliana. Exposure of B. cinerea to camalexin induces expression of BcatrB, an ABC transporter that functions in the efflux of fungitoxic compounds. B. cinerea inoculated...

Université de Fribourg

Bacillus subtilis PTA-271 counteracts Botryosphaeria dieback in grapevine, triggering immune responses and detoxification of fungal phytotoxins

Trotel-Aziz, Patricia ; Abou-Mansour, Eliane ; Courteaux, Barbara ; Rabenoelina, Fanja ; Clément, Christophe ; Fontaine, Florence ; Aziz, Aziz

In: Frontiers in Plant Science, 2019, vol. 10, p. -

Plant pathogens have evolved various strategies to enter hosts and cause diseases. Particularly Neofusicoccum parvum, a member of Botryosphaeria dieback consortium, can secrete the phytotoxins (-)-terremutin and (R)-mellein during grapevine colonization. The contribution of phytotoxins to Botryosphaeria dieback symptoms still remains unknown. Moreover, there are currently no efficient control...

Université de Fribourg

Changes in plant metabolism and accumulation of fungal metabolites in response to Esca proper and apoplexy expression in the whole grapevine

Magnin-Robert, Maryline ; Spagnolo, Alessandro ; Boulanger, Anna ; Joyeux, Cécile ; Clément, Christophe ; Abou-Mansour, Eliane ; Fontaine, Florence

In: Phytopathology

Trunk diseases have become among the most important grapevine diseases worldwide. They are caused by fungal pathogens that attack the permanent woody structure of the vines and cause various symptoms in woody and annual organs. This study examined modifications of plant responses in green stem, cordon and trunk of grapevines expressing Esca proper (E) or apoplexy (A) event, which are the most...

Université de Fribourg

Differential Production of phytotoxins from Phomopsis sp. from grapevine plants showing esca symptoms

Goddard, Mary-Lorène ; Mottier, Nicolas ; Jeanneret-Gris, Julie ; Christen, Danilo ; Tabacchi, Raphaël ; Abou-Mansour, Eliane

In: Journal of Agricultural and Food Chemistry, 2014, vol. 62, no. 34, p. 8602–8607

Nine strains of the fungus Phomopsis spp. were isolated from a vineyard showing decline from the disease esca. Strains were screened for their ability to produce secondary metabolites showing chemical diversity. The culture extracts of each strain were analyzed by liquid chromatography–ultraviolet–diode array detection–mass spectrometry. Three strains were selected for the isolation and...

Université de Fribourg

Differential responses of three grapevine cultivars to Botryosphaeria dieback

Spagnolo, Alessandro ; Magnin-Robert, Maryline ; Alayi, Tchilabalo Dilezitoko ; Cilindre, Clara ; Schaeffer-Reiss, Christine ; Dorsselaer, Alain Van ; Clément, Christophe ; Larignon, Philippe ; Suero-Ramirez, Monserrat ; Chong, Julie ; Bertsch, Christophe ; Abou-Mansour, Eliane ; Fontaine, Florence

In: Phytopathology, 2014, p. -

Botryosphaeria dieback is a fungal grapevine trunk disease which represents a threat for viticulture worldwide due to the decreased production of affected plants and their premature death. This dieback is characterized by a typical wood discoloration called “brown stripe”. Herein, a proteome comparison of the brown striped wood from Botryosphaeria dieback-affected standing vines cultivar...

Université de Fribourg

Disease resistance of Arabidopsis to Phytophthora brassicae is established by the sequential action of indole glucosinolates and camalexin

Schlaeppi, Klaus ; Abou-Mansour, Eliane ; Buchala, Antony J. ; Mauch, Felix

In: The Plant Journal, 2010, vol. 62, no. 5, p. 840 - 851

We have analysed the role of tryptophan-derived secondary metabolites in disease resistance of Arabidopsis to the oomycete pathogen Phytophthora brassicae. Transcript analysis revealed that genes encoding enzymes involved in tryptophan, camalexin and indole glucosinolate (iGS) biosynthesis are coordinately induced in response to P. brassicae. However, a deficiency in either camalexin or iGS...

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

Extracellular compounds produced by fungi associated with Botryosphaeria dieback induce differential defence gene expression patterns and necrosis in Vitis vinifera cv. Chardonnay cells

Ramírez-Suero, M. ; Bénard-Gellon, M. ; Chong, J. ; Laloue, H. ; Stempien, E. ; Abou-Mansour, Eliane ; Fontaine, F. ; Larignon, Philippe ; Mazet-Kieffer, F. ; Farine, S. ; Bertsch, C.

In: Protoplasma, 2014, p. 1–10

Three major grapevine trunk diseases, esca, botryosphaeria dieback and eutypa dieback, pose important economic problems for vineyards worldwide, and currently, no efficient treatment is available to control these diseases. The different fungi associated with grapevine trunk diseases can be isolated in the necrotic wood, but not in the symptomatic leaves. Other factors seem to be responsible for...

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...

Université de Fribourg

Grapevine trunk diseases: complex and still poorly understood

Bertsch, C. ; Ramírez-Suero, M. ; Magnin-Robert, M. ; Larignon, Philippe ; Chong, J. ; Abou-Mansour, Eliane ; Spagnolo, A. ; Clément, C. ; Fontaine, F.

In: Plant Pathology, 2013, vol. 62, no. 2, p. 243–265

This review presents an overview of eutypa dieback, esca and botryosphaeria dieback, the predominant grapevine trunk diseases worldwide. It covers their symptomatologies in the trunk, leaves and berries; the characteristics of the different fungal species associated with them; and host–pathogen interactions. Here, the host–pathogen relationship is defined at the cytological, physiological and...