Bioactivity of Trichoderma harzianum A peptaibols against Zymoseptoria tritici causal agent of septoria leaf blotch of wheat
Ilham Barakat 1, A-D,F
Noureddine CHTAINA 1, A,C,E-F
Taha El Kamli 2, A,C,F
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Department of Production, Protection, and Biotechnology, Hassan II Institute of Agronomic and Veterinary medicine, Morocco
Department of Veterinary, Hassan II Institute of Agronomic and Veterinary medicine, Morocco
FungiSem, IRHS, INRA-University of Angers-Agrocampus-Ouest, France
Laboratory of Phytopathology and Post-Harvest Quality, Regional Centre for Agronomic Research,, Morocco
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
Ilham Barakat   

Department of Production, Protection, and Biotechnology, Hassan II Institute of Agronomic and Veterinary medicine, Al Irfane, 10010, Rabat, Morocco
Submission date: 2022-09-02
Acceptance date: 2022-10-27
Online publication date: 2022-11-03
  • In this study, we developed a novel method to evaluate the antibiosis effect of Trichoderma harzianum A through the use of the nephelometry technique. The results of our study confirmed the efficacy of the methodology adopted and the importance of this novel T. harzianum strain.
Trichoderma harzianum strain A was isolated from the rhizosphere of an argan tree in southern Morocco. Trichoderma harzianum strain A had previously demonstrated a high antagonistic potential in vitro by direct confrontation and in vivo on wheat plants in pots under greenhouse conditions against Zymoseptoria tritici, the agent of septoria leaf blotch. In this study, the activity of filtrates prepared from the liquid culture of T. harzianum A alone and from the confrontation medium with two Z. tritici strains (G1-1 (durum wheat) and A5-1 (soft wheat)) on the inhibition of Z. tritici pycnidiospore germination was studied by nephelometry. The results of the antibiosis assay revealed that filtrate 0 (A in confrontation with G1-1) and F3 (A against A5-1) showed 95% of G1-1 and A5-1 pycnidiospore inhibition at 9/10 dilution of the undiluted filtrates after four days of incubation. To understand and explain the antifungal activity of these filtrates, the extraction and identification of secondary molecules of peptaibiotic nature secreted by T. harzianum A in the three studied filtrates were performed. According to the results of High-Performance Liquid Chromatography-Mass Spectrometry analyses, 38 peptaibiotic molecules reported in the literature for their antifungal activity were identified in the different extracts at high concentrations (high peak intensities). These molecules are divided into nine groups, namely: Trichocryptin, Trichobrevin, Triochocryptin, Hypocompactin, Hyporodicin, Trichocompactin, Alamethicine, Trichoferin, and Trichokonin. It was also shown that the presence of the pathogen induces the production of peptaibols by the antagonistic strain of Trichoderma.
The authors have declared that no conflict of interests exist.