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Multiple gene genealogies and species recognition in the ectomycorrhizal fungus Paxillus involutus.

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Author

Summary, in English

Paxillus involutus (basidiomycetes, Boletales) is a common ectomycorrhizal fungus in the Northern Hemisphere. The fungus displays significant variation in phenotypic characters related to morphology, physiology, and ecology. Previous studies have shown that P. involutus contains several intersterility groups and morphological species. In this study, we have used concordance of multiple gene genealogies to identify genetically isolated species of P. involutus. Fragments from five protein coding genes in 50 isolates of P. involutus collected from different hosts and environments in Europe and one location in Canada were analysed using phylogenetic methods. Concordance of the five gene genealogies showed that P. involutus comprises at least four distinct phylogenetic lineages: phylogenetic species I (with nine isolates), II (33 isolates), III (three isolates), and IV (five isolates). The branches separating the four species were long and well supported compared with the species internodes. A low level of shared polymorphisms was observed among the four lineages indicating a long time since the genetic isolation began. Three of the phylospecies corresponded to earlier identified morphological species: I to P. obscurosporus, II to P. involutus s. str., and III to P. validus. The phylogenetic species had an overlapping geographical distribution. Species I and II differed partly in habitat and host preferences.

Publishing year

2008

Language

English

Pages

965-975

Publication/Series

Mycological Research

Volume

112

Issue

8

Document type

Journal article

Publisher

Cambridge University Press

Topic

  • Biological Sciences

Keywords

  • ITS sequences
  • Cryptic species
  • Boletales
  • Mycorrhizas
  • Phylogenetic species Species concepts

Status

Published

Research group

  • Microbial Ecology

ISBN/ISSN/Other

  • ISSN: 0953-7562