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The Trichoderma koningii aggregate species.

Gary J Samuels1, Sarah L Dodd, Bing-Sheng Lu

  • 1United States Department of Agriculture, Agricultural Research Service, Systematic Botany and Mycology Laboratory, Rm 304, B-011A, Beltsville, Maryland 20705, U.S.A.

Studies in Mycology
|May 21, 2008
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Summary
This summary is machine-generated.

The study reclassifies Trichoderma koningii, revealing it encompasses multiple species with distinct traits and origins. Molecular and phenotypic data led to a new taxonomy with twelve species and one variety.

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Area of Science:

  • Mycology
  • Systematic Botany
  • Molecular Biology

Background:

  • The morphological concept of Trichoderma koningii is complex, encompassing diverse phenotypes and biogeographic distributions.
  • Previous classifications did not fully resolve the species boundaries within this group.

Purpose of the Study:

  • To clarify the taxonomic status of Trichoderma koningii and related species.
  • To establish a robust classification system based on integrated molecular and phenotypic data.

Main Methods:

  • Phylogenetic analysis using partial sequences of translation-elongation factor 1 alpha (tef1), actin, and calmodulin genes.
  • Morphological characterization, including conidium morphology and growth rate.
  • Biogeographic data collection and analysis.

Main Results:

  • Phenotypic characters attributed to T. koningii evolved independently in three distinct phylogenetic lineages.
  • A revised taxonomy recognizes twelve species and one variety within these lineages.
  • Geographic distribution and host associations for several species were detailed, with T. koningii s. str. being uncommon and restricted.

Conclusions:

  • The study redefines the T. koningii complex, establishing a clear taxonomic framework.
  • New species and varieties within the T. koningii complex have been identified and described.
  • Potential biological control applications of T. ovalisporum and T. koningiopsis isolates are highlighted.