RAVEAU, Robin; ILBERT, Chloé; HELOIR, Marie-Claire; PALAVIOUX, Karine; PEBARTHE-COURROUILH, Anthony; MARZARI, Tania; DURAND, Solène; VALLS-FONAYET, Josep; CLUZET, Stephanie; ADRIAN, Marielle; FERMAUD, Marc

doi:10.3390/jof10070471

RAVEAU, Robin
Santé et agroécologie du vignoble [UMR SAVE]

ILBERT, Chloé

HELOIR, Marie-Claire

Langue

Article de revue

Ce document a été publié dans

Journal of Fungi. 2024-07-09, vol. 10, n° 7, p. 471

Résumé en anglais

Black rot (Guignardia bidwellii) and downy mildew (Plasmopara viticola) are two major grapevine diseases against which the development of efficient biocontrol solutions is required in a context of sustainable viticulture. This study aimed at evaluating and comparing the efficacy and modes of action of bacterial culture supernatants from Bacillus velezensis Buz14 and B. ginsengihumi S38. Both biocontrol agents (BCA) were previously demonstrated as highly effective against Botrytis cinerea in grapevines. In semi-controlled conditions, both supernatants provided significant protection against black rot and downy mildew. They exhibited antibiosis against the pathogens by significantly decreasing G. bidwellii mycelial growth, but also the release and motility of P. viticola zoospores. They also significantly induced grapevine defences, as stilbene production. The LB medium, used for the bacterial cultures, also showed partial effects against both pathogens and induced plant defences. This is discussed in terms of choice of experimental controls when studying the biological activity of BCA supernatants. Thus, we identified two bacterial culture supernatants as new potential biocontrol products exhibiting multi-spectrum antagonist activity against different grapevine key pathogens and having a dual mode of action.< Réduire

Mots clés en anglais

Bacillus velezensis

Bacillus ginsengihumi

Biocontrol

Biological control

Vitis vinifera

Guignardia bidwellii

Plasmopara viticola

Antibiosis

Plant defence

URI

https://oskar-bordeaux.fr/handle/20.500.12278/202328

DOI

http://dx.doi.org/10.3390/jof10070471

Project ANR

Cultivating the grapevine without pesticides : towards agroecological wine-producing socio-ecosystems - ANR-20-PCPA-0010

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Broad-Spectrum Efficacy and Modes of Action of Two Bacillus Strains against Grapevine Black Rot and Downy Mildew

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Broad-Spectrum Efficacy and Modes of Action of Two Bacillus Strains against Grapevine Black Rot and Downy Mildew

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Résumé en anglais

Mots clés en anglais

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DOI

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Unités de recherche