Article (Scientific journals)
Deciphering the mechanisms involved in reduced sensitivity to azoles and fengycin lipopeptide in Venturia inaequalis.
Leconte, Aline; Jacquin, Justine; Duban, Matthieu et al.
2024In Microbiological Research, 286, p. 127816
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Keywords :
Antifungal activity; Azoles; Bacillus sp.; Lipids; Lipopeptides; Venturia inaequalis; fengycin; Antifungal Agents; Fungicides, Industrial; Fungal Proteins; Drug Resistance, Fungal/genetics; Microbial Sensitivity Tests; Antifungal Agents/pharmacology; Antifungal Agents/metabolism; Fungicides, Industrial/pharmacology; Gene Expression Regulation, Fungal/drug effects; Fungal Proteins/genetics; Fungal Proteins/metabolism; Lipopeptides/pharmacology; Malus/microbiology; Plant Diseases/microbiology; Ascomycota/drug effects; Ascomycota/metabolism; Ascomycota/genetics; Azoles/pharmacology; Antifungal activities; Azole; Fengycins; Iturins; Reduced sensitivity; Tebuconazole; Microbiology
Abstract :
[en] Apple scab, caused by the hemibiotrophic fungus Venturia inaequalis, is currently the most common and damaging disease in apple orchards. Two strains of V. inaequalis (S755 and Rs552) with different sensitivities to azole fungicides and the bacterial metabolite fengycin were compared to determine the mechanisms responsible for these differences. Antifungal activity tests showed that Rs552 had reduced sensitivity to tebuconazole and tetraconazole, as well as to fengycin alone or in a binary mixture with other lipopeptides (iturin A, pumilacidin, lichenysin). S755 was highly sensitive to fengycin, whose activity was close to that of tebuconazole. Unlike fengycin, lipopeptides from the iturin family (mycosubtilin, iturin A) had similar activity on both strains, while those from the surfactin family (lichenysin, pumilacidin) were not active, except in binary mixtures with fengycin. The activity of lipopeptides varies according to their family and structure. Analyses to determine the difference in sensitivity to azoles (which target the CYP51 enzyme involved in the ergosterol biosynthesis pathway) showed that the reduced sensitivity in Rs552 is linked to (i) a constitutive increased expression of the Cyp51A gene caused by insertions in the upstream region and (ii) greater efflux by membrane pumps with the involvement of ABC transporters. Microscopic observations revealed that fengycin, known to interact with plasma membranes, induced morphological and cytological changes in cells from both strains. Sterol and phospholipid analyses showed a higher level of ergosta-7,22-dien-3-ol and a lower level of PI(C16:0/C18:1) in Rs552 compared with S755. These differences could therefore influence the composition of the plasma membrane and explain the differential sensitivity of the strains to fengycin. However, the similar antifungal activities of mycosubtilin and iturin A in the two strains indirectly indicate that sterols are probably not involved in the fengycin resistance mechanism. This leads to the conclusion that different mechanisms are responsible for the difference in susceptibility to azoles or fengycin in the strains studied.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Leconte, Aline ;  Université de Liège - ULiège > TERRA Research Centre
Jacquin, Justine;  JUNIA, UMRt BioEcoAgro 1158-INRAE, Plant Secondary Metabolites Team, Charles Viollette Institute, Lille F-59000, France
Duban, Matthieu;  University of Lille, UMRt BioEcoAgro 1158-INRAE, Microbial Secondary Metabolites team, Charles Viollette Institute, Lille F-59000, France
Deweer, Caroline;  JUNIA, UMRt BioEcoAgro 1158-INRAE, Plant Secondary Metabolites Team, Charles Viollette Institute, Lille F-59000, France
Trapet, Pauline;  JUNIA, UMRt BioEcoAgro 1158-INRAE, Plant Secondary Metabolites Team, Charles Viollette Institute, Lille F-59000, France
Laruelle, Frédéric;  Unité de Chimie Environnementale et Interactions sur le Vivant (EA 4492), Université Littoral Côte d'Opale, CEDEX CS 80699, Calais 62228, France
Farce, Amaury;  Université Lille, Inserm, CHU Lille, U1286 - INFINITE - Institut de recherche translationnelle sur l'inflammation, Lille F-59000, France
Compère, Philippe ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution
Sahmer, Karin;  Université Lille, IMT Lille Douai, Univ. Artois, JUNIA, ULR 4515 - LGCgE, Laboratoire de Génie Civil et geo-Environnement, Lille F-59000, France
Fiévet, Valentin;  JUNIA, UMRt BioEcoAgro 1158-INRAE, Plant Secondary Metabolites Team, Charles Viollette Institute, Lille F-59000, France
Hoste, Alexis  ;  Université de Liège - ULiège > Département GxABT > Microbial technologies
Siah, Ali;  JUNIA, UMRt BioEcoAgro 1158-INRAE, Plant Secondary Metabolites Team, Charles Viollette Institute, Lille F-59000, France
Lounès-Hadj Sahraoui, Anissa;  Unité de Chimie Environnementale et Interactions sur le Vivant (EA 4492), Université Littoral Côte d'Opale, CEDEX CS 80699, Calais 62228, France
Jacques, Philippe ;  Université de Liège - ULiège > TERRA Research Centre
Coutte, François;  University of Lille, UMRt BioEcoAgro 1158-INRAE, Microbial Secondary Metabolites team, Charles Viollette Institute, Lille F-59000, France
Deleu, Magali  ;  Université de Liège - ULiège > TERRA Research Centre > Chemistry for Sustainable Food and Environmental Systems (CSFES)
Muchembled, Jérôme;  JUNIA, UMRt BioEcoAgro 1158-INRAE, Plant Secondary Metabolites Team, Charles Viollette Institute, Lille F-59000, France. Electronic address: jerome.muchembled@junia.com
More authors (7 more) Less
Language :
English
Title :
Deciphering the mechanisms involved in reduced sensitivity to azoles and fengycin lipopeptide in Venturia inaequalis.
Publication date :
September 2024
Journal title :
Microbiological Research
ISSN :
0944-5013
Publisher :
Elsevier GmbH, Germany
Volume :
286
Pages :
127816
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
This work was supported by the Hauts-de-France Regional Council (France), the CPER BiHauts Eco de France (France), with co-funding from Junia (France), the FNRS (Belgium) and the University of Li\u00E8ge (Belgium).This work was supported by the Hauts-de-France Regional Council (France), the CPER BiHauts Eco de France (France), with co-funding from Junia (France), the University of Li\u00E8ge (Belgium) (project PHENIX biocontrol, FEDER program 2021-2027) and the F.R.S-FNRS (Belgium) (PDR Project Surfasymm, grant T.0063.19).
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