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Article

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

by
Robin Raveau
1,†,
Chloé Ilbert
2,†,
Marie-Claire Héloir
2,
Karine Palavioux
2,
Anthony Pébarthé-Courrouilh
3,
Tania Marzari
2,
Solène Durand
1,
Josep Valls-Fonayet
3,4,
Stéphanie Cluzet
3,
Marielle Adrian
2,‡ and
Marc Fermaud
1,*,‡
1
National Research Institute for Agriculture, Food and the Environment (INRAE), Institute of Vine and Wine Sciences (ISVV), UMR Santé Agroécologie du VignoblE (SAVE), 71 Avenue E. Bourlaux, CS 20032, 33882 Villenave d’Ornon, France
2
Agroécologie, National Research Institute for Agriculture, Food and the Environment (INRAE), Institut Agro Dijon, Univ. Bourgogne, 21000 Dijon, France
3
Univ. Bordeaux, Bordeaux INP, National Research Institute for Agriculture, Food and the Environment (INRAE), OENO, UMR 1366, Institute of Vine and Wine Sciences (ISVV), 33140 Villenave d’Ornon, France
4
Bordeaux Metabolome, MetaboHUB, 33140 Villenave d’Ornon, France
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
‡
These authors contributed equally to this work.
J. Fungi 2024, 10(7), 471; https://doi.org/10.3390/jof10070471
Submission received: 17 May 2024 / Revised: 27 June 2024 / Accepted: 4 July 2024 / Published: 9 July 2024
(This article belongs to the Special Issue Biocontrol of Grapevine Diseases, 2nd Edition)
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Abstract

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.
Keywords: Bacillus velezensis; Bacillus ginsengihumi; biocontrol; biological control; Vitis vinifera; Guignardia bidwellii; Plasmopara viticola; antibiosis; plant defence Bacillus velezensis; Bacillus ginsengihumi; biocontrol; biological control; Vitis vinifera; Guignardia bidwellii; Plasmopara viticola; antibiosis; plant defence

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MDPI and ACS Style

Raveau, R.; Ilbert, C.; Héloir, M.-C.; Palavioux, K.; Pébarthé-Courrouilh, A.; Marzari, T.; Durand, S.; Valls-Fonayet, J.; Cluzet, S.; Adrian, M.; et al. Broad-Spectrum Efficacy and Modes of Action of Two Bacillus Strains against Grapevine Black Rot and Downy Mildew. J. Fungi 2024, 10, 471. https://doi.org/10.3390/jof10070471

AMA Style

Raveau R, Ilbert C, Héloir M-C, Palavioux K, Pébarthé-Courrouilh A, Marzari T, Durand S, Valls-Fonayet J, Cluzet S, Adrian M, et al. Broad-Spectrum Efficacy and Modes of Action of Two Bacillus Strains against Grapevine Black Rot and Downy Mildew. Journal of Fungi. 2024; 10(7):471. https://doi.org/10.3390/jof10070471

Chicago/Turabian Style

Raveau, Robin, Chloé Ilbert, Marie-Claire Héloir, Karine Palavioux, Anthony Pébarthé-Courrouilh, Tania Marzari, Solène Durand, Josep Valls-Fonayet, Stéphanie Cluzet, Marielle Adrian, and et al. 2024. "Broad-Spectrum Efficacy and Modes of Action of Two Bacillus Strains against Grapevine Black Rot and Downy Mildew" Journal of Fungi 10, no. 7: 471. https://doi.org/10.3390/jof10070471

APA Style

Raveau, R., Ilbert, C., Héloir, M.-C., Palavioux, K., Pébarthé-Courrouilh, A., Marzari, T., Durand, S., Valls-Fonayet, J., Cluzet, S., Adrian, M., & Fermaud, M. (2024). Broad-Spectrum Efficacy and Modes of Action of Two Bacillus Strains against Grapevine Black Rot and Downy Mildew. Journal of Fungi, 10(7), 471. https://doi.org/10.3390/jof10070471

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