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Université de Fribourg

Vitis methods to understand and develop strategies for diagnosis and sustainable control of grapevine trunk diseases

Reis, P. ; Pierron, R. ; Larignon, P. ; Lecomte, P. ; Abou-Mansour, Eliane ; Farine, S. ; Bertsch, C. ; Jacques, A. ; Trotel-Aziz, P. ; Rego, C. ; Fontaine, F.

In: Phytopathology, 2019, vol. 109, no. 6, p. 916–931

Vitis vinifera is affected by many diseases every year, depending on causal agents, susceptibility of cultivars, and climate region. Some are caused by a single agent, such as gray mold caused by Botrytis cinerea or powdery mildew caused by Erysiphe necator. Others result from the actions of a complex of pathogens such as grapevine trunk diseases (GTDs). GTDs are presently among the most...

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

Life traits of four Botryosphaeriaceae species and molecular responses of different grapevine cultivars or hybrids

Bellée, A. ; Comont, G. ; Nivault, A. ; Abou-Mansour, Eliane ; Coppin, C. ; Dufour, M. C. ; Corio-Costet, M. F.

In: Plant Pathology, 2017, vol. 66, no. 5, p. 763–776

Botryosphaeriaceae is a fungal family comprising many species involved in botryosphaeria dieback, a worldwide grapevine trunk disease. Currently, the interactions between Botryosphaeriaceae species and various grapevine cultivars are poorly understood and little data is available. This study investigated various life traits of five isolates belonging to four species of Botryosphaeriaceae...

Université de Fribourg

Reproducing Botryosphaeria dieback foliar symptoms in a simple model system

Reis, Pedro ; Magnin-Robert, Maryline ; Nascimento, Teresa ; Spagnolo, Alessandro ; Abou-Mansour, Eliane ; Fioretti, Cristina ; Clément, Christophe ; Rego, Cecilia ; Fontaine, Florence

In: Plant Disease

Botryosphaeria dieback is a grapevine trunk disease with a worldwide distribution and associated with Diplodia seriata and Neofusicoccum parvum among several other Botryosphaeriaceae species. The aforementioned xylem-inhabiting fungi cause wood lesions, leaf and berry symptoms and eventually lead to the death of the plant. The aim of this work was to develop a simple model system to reproduce the...

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

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

Phytotoxic metabolites from Neofusicoccum parvum, a pathogen of Botryosphaeria dieback of grapevine

Abou-Mansour, Eliane ; Débieux, Jean-Luc ; Ramírez-Suero, Montserrat ; Bénard-Gellon, Mélanie ; Magnin-Robert, Maryline ; Spagnolo, Alessandro ; Chong, Julie ; Farine, Sibylle ; Bertsch, Christohpe ; L’Haridon, Floriane ; Serrano, Mario ; Fontaine, Florence ; Rego, Cecilia ; Larignon, Philippe

In: Phytochemistry, 2015, vol. 115, p. 207–215

Liquid chromatography-diode array screening of the organic extract of the cultures of 13 isolates of the fungus Neofusicoccum parvum, the main causal agent of botryosphaeria dieback of grapevine, showed similar metabolites. One strain was selected for further chemical studies and led to the isolation and characterisation of 13 metabolites. Structures were elucidated through spectroscopic...

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...