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Disentangling the Trichoderma viridescens complex.

W M Jaklitsch1, G J Samuels2, A Ismaiel3

  • 1Department of Systematic and Evolutionary Botany, Faculty Centre of Biodiversity, University of Vienna, Rennweg 14, A-1030 Vienna, Austria;

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|April 25, 2014
PubMed
Summary
This summary is machine-generated.

Multigene phylogenetic analyses reveal Trichoderma viridescens is a species complex comprising 13 distinct species. This study clarifies typification and introduces new species descriptions, enhancing fungal taxonomy.

Keywords:
HypocreaHypocreaceaeacl1phylogenetic analysisrpb2systematicstef1

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Area of Science:

  • Mycology
  • Fungal Taxonomy
  • Phylogenetics

Background:

  • Trichoderma viridescens is recognized as a species complex.
  • Previous phylogenetic studies have not fully resolved the species boundaries within this group.
  • Phenotypic differentiation among closely related Trichoderma species is often limited.

Purpose of the Study:

  • To resolve the species complex of Trichoderma viridescens using multigene phylogenetic analyses.
  • To clarify the typification of T. viridescens and formally describe new species.
  • To investigate the phylogenetic utility of the atp citrate lyase (acl1) gene in Trichoderma.

Main Methods:

  • Multigene phylogenetic analyses utilizing the translation elongation factor 1-alpha (tef1) gene, the rpb2 gene, and the atp citrate lyase (acl1) gene.
  • Typification of T. viridescens and formal description of eleven new species.
  • Phenotypic characterization, including pigment production on cornmeal dextrose agar.

Main Results:

  • Identification of 13 distinct phylogenetic species within the T. viridescens complex.
  • Clarification of T. viridescens s.str. typification and replacement of Hypocrea viridescens with T. paraviridescens.
  • Formal description and illustration of eleven new species, including T. olivascens, characterized by olivaceous pigment production.

Conclusions:

  • The T. viridescens complex is resolved into 13 phylogenetic species with limited phenotypic differentiation.
  • The atp citrate lyase (acl1) gene is a valuable marker for Trichoderma phylogenetics.
  • This study provides a robust taxonomic framework for the T. viridescens group, aiding future research.