Modulation of growth and mycotoxigenic potential of pineapple fruitlet core rot pathogens during in vitro interactions

Vignassa Manon, Soria Christian, Durand Noël, Poss Charlie, Meile Jean-Christophe, Chillet Marc, Schorr-Galindo Sabine. 2024. Modulation of growth and mycotoxigenic potential of pineapple fruitlet core rot pathogens during in vitro interactions. Toxins, 16 (8), 17 p.

Résumé : Pineapple Fruitlet Core Rot (FCR) is a fungal disease characterized by a multi-pathogen pathosystem. Recently, Fusarium proliferatum, Fusarium oxysporum, and Talaromyces stollii joined the set of FCR pathogens until then exclusively attributed to Fusarium ananatum. The particularity of FCR relies on the presence of healthy and diseased fruitlets within the same infructescence. The mycobiomes associated with these two types of tissues suggested that disease occurrence might be triggered by or linked to an ecological chemical communication-promoting pathogen(s) development within the fungal community. Interactions between the four recently identified pathogens were deciphered by in vitro pairwise co-culture bioassays. Both fungal growth and mycotoxin production patterns were monitored for 10 days. Results evidenced that Talaromyces stollii was the main fungal antagonist of Fusarium species, reducing by 22% the growth of Fusarium proliferatum. A collapse of beauvericin content was observed when FCR pathogens were cross-challenged while fumonisin concentrations were increased by up to 7-fold. Antagonism between Fusarium species and Talaromyces stollii was supported by the diffusion of a red pigmentation and droplets of red exudate at the mycelium surface. This study revealed that secondary metabolites could shape the fungal pathogenic community of a pineapple fruitlet and contribute to virulence promoting FCR establishment.

Mots-clés Agrovoc : maladie fongique, Fusarium oxysporum, Fusarium, fumonisine, mycotoxine, agent pathogène, croissance, pouvoir pathogène, Fusarium proliferatum, Talaromyces, pourriture, Ananas comosus

Mots-clés géographiques Agrovoc : France, La Réunion

Mots-clés libres : Ananas comosus, Beauvericin, Co-culture, Fruitlet core rot, Fumonisins, Fusarium, LC/MS-MS

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement européennes : European Regional Development Fund

Agences de financement hors UE : Conseil Régional de La Réunion

Auteurs et affiliations

• Vignassa Manon, Université de Montpellier (FRA)
• Soria Christian, CIRAD-PERSYST-UMR Qualisud (REU) ORCID: 0000-0002-7235-7872
• Durand Noël, CIRAD-PERSYST-UMR Qualisud (FRA) ORCID: 0000-0003-1627-6848
• Poss Charlie, CIRAD-PERSYST-UMR Qualisud (FRA)
• Meile Jean-Christophe, CIRAD-PERSYST-UMR Qualisud (FRA) ORCID: 0000-0002-6747-2104
• Chillet Marc, CIRAD-PERSYST-UMR Qualisud (REU)
• Schorr-Galindo Sabine, Université de Montpellier (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/610298/)

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