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Colletotrichum fioriniae Development in Water and Chloroform-based Blueberry and Cranberry Floral Extracts
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Published on: April 12, 2019

The Colletotrichum acutatum species complex.

U Damm1, P F Cannon, J H C Woudenberg

  • 1CBS-KNAW Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands.

Studies in Mycology
|November 9, 2012
PubMed
Summary

This study redefines the Colletotrichum acutatum species complex, identifying 31 distinct species, including 21 new ones. Phylogenetic analysis reveals new taxa and clarifies relationships within this important plant pathogen group.

Keywords:
AscomycotaColletotrichum acutatumGloeosporiumGlomerellaanthracnosephylogenysystematics

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Published on: September 29, 2023

Area of Science:

  • Mycology
  • Plant Pathology
  • Molecular Phylogenetics

Background:

  • Colletotrichum acutatum is a globally significant anthracnose pathogen affecting numerous host plants.
  • Previous research indicated the existence of subgroups within the C. acutatum species complex.
  • High phenotypic diversity and host/geographic specificity have been observed within this complex.

Purpose of the Study:

  • To resolve the taxonomic complexities within the Colletotrichum acutatum species complex.
  • To identify and describe novel taxa within the complex using molecular phylogenetic methods.
  • To investigate the evolutionary relationships and diversity of C. acutatum and related species.

Main Methods:

  • Multilocus molecular phylogenetic analysis using ITS, ACT, TUB2, CHS-1, GAPDH, and HIS3 gene regions.
  • Analysis of 331 strains of C. acutatum and related taxa from diverse hosts and geographic locations.
  • Morphological characterization and taxonomic descriptions of identified species.

Main Results:

  • The study confirmed previously recognized molecular groups and identified numerous novel taxa.
  • Thirty-one species are now accepted within the complex, with 21 being newly described.
  • Colletotrichum orchidophilum was found to cluster basally to the C. acutatum complex.
  • Only C. salicis and C. rhombiforme produced sexual morphs in culture; evidence of hybridization was observed.
  • A new species, C. pseudoacutatum, morphologically similar to C. acutatum but distinct, was described.

Conclusions:

  • The C. acutatum species complex is taxonomically complex, comprising at least 31 distinct species.
  • Molecular phylogenetics is crucial for accurately delineating species within morphologically similar fungal groups.
  • The findings provide a revised understanding of C. acutatum diversity, host associations, and evolutionary history.