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Biogeographical patterns in Artomyces pyxidatus.

Edgar B Lickey1, Karen W Hughes, Ronald H Petersen

  • 1Department of Botany, University of Tennessee, Knoxville, Tennessee 37996.

Mycologia
|December 16, 2010
PubMed
Summary
This summary is machine-generated.

Artomyces pyxidatus, a widespread fungus, shows distinct genetic lineages across continents. Eurasian and North American populations form separate groups, with North American isolates further divided geographically.

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Area of Science:

  • Mycology
  • Population Genetics
  • Molecular Systematics

Background:

  • Artomyces pyxidatus is a lignicolous, coralloid basidiomycete found in temperate Northern Hemisphere regions.
  • Previous research indicated conspecificity among populations from the eastern United States, Sweden, and China based on mating and enzyme profiles.

Purpose of the Study:

  • To investigate the molecular diversity and population structure of Artomyces pyxidatus.
  • To extend mating compatibility studies to new geographical regions and analyze genetic variation using DNA sequencing and RFLP.

Main Methods:

  • Mating compatibility tests were performed on isolates from Russia, Costa Rica, Mexico, and Utah.
  • DNA sequence and restriction site analyses of the nuclear ribosomal internally transcribed spacer region (ITS1-5.8S-ITS2) were conducted.
  • Phylogenetic analysis of twelve isolates and RFLP survey of 255 isolates were performed.

Main Results:

  • Mating compatibility was confirmed with additional global collections.
  • Phylogenetic analysis of ITS sequences revealed a clear geographical pattern: Eurasian isolates form a sister clade to North American isolates.
  • North American isolates are further subdivided into northeastern and southwestern clades.
  • Restriction fragment length polymorphism (RFLP) patterns corroborated these geographical patterns.

Conclusions:

  • Artomyces pyxidatus exhibits significant molecular and geographical structuring.
  • Eurasian and North American populations represent distinct evolutionary lineages.
  • Further subdivision within North American populations suggests localized diversification.