Impacts of abiotic factors on the growth of three commercial biological control agents, on the growth and mycotoxinogenesis of Fusarium graminearum and on their interaction

Dieye Cheikh Ahmeth Tidiane, Durand Noel, Schorr-Galindo Sabine, Strub Caroline, Fontana Angélique. 2024. Impacts of abiotic factors on the growth of three commercial biological control agents, on the growth and mycotoxinogenesis of Fusarium graminearum and on their interaction. Journal of the Science of Food and Agriculture, 103 (2) : 932-941.

Résumé : BACKGROUND: Evolving climatic conditions impact the behavior of microorganisms. The lack of efficiency of beneficial microorganisms against pathogens can be due to these evolving abiotic factors more favorable to the development and adaptation of pathogens. It is therefore of great interest to understand their impact (especially temperature increase and relative humidity (RH) variation) on pathogenic and non-pathogenic microorganisms. This work aimed to examine the possible effects of increasing temperature (20, 25, 30 and 33 °C) and RH (40%, 50%, 60% and 80%) on the growth and mycotoxin production (deoxynivalenol (DON) and zearalenone (ZEN)) of Fusarium graminearum, on the growth of three commercial biocontrol agents (BCAs; Mycostop®, Xedavir® and Polyversum®) and on the pathogen–BCA interaction. RESULTS: Results demonstrated that BCAs have contrasting impacts on the growth and mycotoxinogenesis of F. graminearum depending on abiotic factors. At 25 °C and regardless of RH, commercial BCAs limit DON production by F. graminearum, but at 30 °C and intermediate RH, Xedavir® is no longer effective. The ability of Xedavir® to control the production of ZEN production by F. graminearum is also affected by abiotic factors. However, increasing temperature has an opposite effect on its ability to control the accumulation of ZEN. Polyversum® oomycete is the BCA with the most resilient efficacy against F. graminearum toxinogenesis under the different abiotic factors. CONCLUSION: This work provides new knowledge of the effect of these abiotic parameters on the interaction between BCA and F. graminearum, especially on the production of mycotoxins. It paves the way for the development of efficient and resilient mycotoxin biocontrol strategies using beneficial microorganisms against F. graminearum, thus contributing to global food security. © 2023 Society of Chemical Industry.

Mots-clés Agrovoc : mycotoxine, agent de lutte biologique, interactions biologiques, facteurs abiotiques, lutte biologique, Fusarium, température, Gibberella zeae, changement climatique, facteur climatique, expérimentation in vitro, croissance, contrôle de maladies

Mots-clés libres : Abiotic factors, BCAs, F.graminearum, Temperature, Humidity, Mycotoxins

Classification Agris : H20 - Maladies des plantes
H50 - Troubles divers des plantes

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

Auteurs et affiliations

• Dieye Cheikh Ahmeth Tidiane, Université de Montpellier (FRA) - auteur correspondant
• Durand Noel, CIRAD-PERSYST-UMR Qualisud (FRA) ORCID: 0000-0003-1627-6848
• Schorr-Galindo Sabine, Université de Montpellier (FRA)
• Strub Caroline, Université de Montpellier (FRA)
• Fontana Angélique, Université de Montpellier (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/610042/)

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