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Secondary metabolism in Trichoderma--a genomic perspective.

Prasun K Mukherjee1, Benjamin A Horwitz2, Charles M Kenerley3

  • 1Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.

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Summary

Trichoderma fungi possess numerous secondary metabolite (SM) genes, with mycoparasitic species showing higher enrichment. Understanding these SMs is crucial for safe biocontrol applications.

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Area of Science:

  • Fungal Genomics
  • Secondary Metabolite Biosynthesis
  • Biocontrol Agents

Background:

  • Trichoderma species are prolific producers of diverse secondary metabolites (SMs).
  • Genome sequencing revealed extensive gene clusters for SM biosynthesis, including non-ribosomal peptides, polyketides, terpenoids, and pyrones.
  • Mycoparasitic Trichoderma virens and T. atroviride exhibit a greater number of SM-related genes than T. reesei.

Purpose of the Study:

  • To explore the secondary metabolome of Trichoderma species.
  • To correlate genomic data with SM production.
  • To understand the ecological roles and potential applications of Trichoderma SMs.

Main Methods:

  • Comparative genomics analysis of three Trichoderma spp. genomes.
  • Identification of secondary metabolite biosynthesis gene clusters.
  • Review of existing literature on fungal SMs and Trichoderma biology.

Main Results:

  • Trichoderma genomes harbor a vast array of SM biosynthesis genes.
  • Enrichment of polyketide synthases and non-ribosomal peptide synthetases in mycoparasitic species.
  • Production of peptaibols and potential siderophore synthesis identified.

Conclusions:

  • Trichoderma SM gene repertoire is extensive and species-specific.
  • Further metabolomic and genomic studies are needed to elucidate functions of 'silent' SM clusters.
  • Knowledge of SM profiles is essential for safe and effective application of Trichoderma in biocontrol.