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Evaluating species in Botryosphaeriales.

W Zhang1, J Z Groenewald2, L Lombard2

  • 1School of Geographical Science, Lingnan Normal University, Zhanjiang 524048, China.

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|August 8, 2022
PubMed
Summary
This summary is machine-generated.

This study clarifies fungal species in the Botryosphaeriales order using multigene phylogenetic analyses. It reclassifies 58 species and introduces 8 new ones, improving fungal taxonomy and identification.

Keywords:
Multi-Locus Sequence Typing (MLST)canker and leaf spot pathogensnew taxasystematics

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Area of Science:

  • Mycology and Plant Pathology
  • Fungal Taxonomy and Systematics
  • Molecular Phylogenetics

Background:

  • The order Botryosphaeriales (Dothideomycetes) comprises numerous endophytic, saprobic, and plant pathogenic fungi, primarily affecting woody plants.
  • Previous phylogenetic studies have evaluated genera and families within this order, necessitating further taxonomic clarification.
  • Accurate identification of fungal isolates in culture collections is crucial for understanding their ecological roles and pathogenic potential.

Purpose of the Study:

  • To conduct multigene phylogenetic analyses on additional fungal isolates within the Botryosphaeriales order.
  • To resolve taxonomic uncertainties, reduce synonymies, and describe novel species based on molecular and morphological data.
  • To evaluate the reliability of different genetic markers for fungal species identification.

Main Methods:

  • Multigene phylogenetic analyses were performed using ITS, tef1, tub2, LSU, and rpb2 gene loci for 230 fungal isolates.
  • Morphological data were integrated with molecular data to support species delimitation.
  • Phylogenetic analyses were combined with reassessment of existing fungal collections, including the Westerdijk Institute's culture collection (CBS).

Main Results:

  • Fifty-eight existing species within the Botryosphaeriales were reduced to synonymy based on the phylogenetic and morphological evidence.
  • Eight new species were described and formally named, including Diplodia afrocarpi, Dothiorella diospyricola, and Lasiodiplodia acaciae.
  • The study identified tef1, tub2, and rpb2 as reliable markers, with a combination of ITS, tef1, tub2, and rpb2 providing robust species-level resolution.

Conclusions:

  • The study significantly clarifies the taxonomy of the Botryosphaeriales, resolving numerous previously misidentified or unassigned isolates.
  • The findings provide a robust foundation for future research on fungal taxa within this important order.
  • Reassessing fungal collections using modern taxonomic methods is essential for accurate fungal identification and classification.