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Trichothecene production by Trichoderma brevicompactum
Kristian Fog Nielsen1, Tom Gräfenhan, Doustmorad Zafari
1Center for Microbial Biotechnology, BioCentrum-DTU, Technical University of Denmark.
Journal of Agricultural and Food Chemistry
|October 13, 2005
Summary
Trichoderma brevicompactum produces trichothecenes, including trichodermin and harzianum A, particularly in liquid media. This study reclassifies original T. viride and T. harzianum strains as T. brevicompactum using multiple identification methods.
Area of Science:
- Mycology
- Natural Product Chemistry
Background:
- Trichothecenes are mycotoxins produced by various fungi.
- Accurate fungal species identification is crucial for understanding toxin production.
Purpose of the Study:
- To screen several Trichoderma species for trichothecene production.
- To investigate the biosynthesis of harzianum A.
- To re-evaluate the taxonomic classification of specific Trichoderma strains.
Main Methods:
- Cultivation of fungi on diverse solid and liquid media.
- Detection and characterization of trichothecenes using liquid chromatography, UV/vis spectroscopy, and high-resolution mass spectrometry.
- Fungal identification based on metabolite profiles, micromorphology, macromorphology, and DNA sequencing (ITS1/ITS2).
Main Results:
- Trichoderma brevicompactum consistently produced trichodermin and/or harzianum A across all tested media, with higher yields in liquid cultures.
- Harzianum A biosynthesis involves the esterification of trichodermol with octa-2Z,4E,6E-trienedioic acid.
- Original strains of T. viride and T. harzianum were reclassified as T. brevicompactum based on comprehensive analyses.
Conclusions:
- Trichoderma brevicompactum is a significant producer of trichothecenes.
- The study clarifies the biosynthetic pathway of harzianum A.
- Taxonomic reclassification of key strains enhances understanding of Trichoderma species and their metabolites.
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