Evolution and host specificity in the ectomycorrhizal genus Leccinum

H.C. den Bakker, G.C. Zuccarello, T.W. Kuyper, M.E. Noordeloos

Research output: Contribution to journalArticleAcademicpeer-review

51 Citations (Scopus)

Abstract

Species of the ectomycorrhizal genus Leccinum are generally considered to be host specialists. We determined the phylogenetic relationships between species of Leccinum from Europe and North America based on second internal transcribed spacer (ITS2) and glyceraldehyde 3-phosphate dehydrogenase (Gapdh). We plotted host associations onto the phylogenies using maximum likelihood and parsimony approaches. Resolution of the phylogeny was greater with Gapdh vs ITS2, plus the Gapdh and ITS phylogenies were highly incongruent. In Leccinum the coding region of Gapdh evolved clocklike, allowing the application of a molecular clock for the reconstruction of host specificity. Almost all species of Leccinum are highly host tree specific, except Leccinum aurantiacum, which associates with a broad range of host trees. Maximum likelihood reconstructions of the ancestral host associations show that this taxon evolved from a specialist. Our results indicate episodes of rapid speciation coinciding with or immediately following host switches. We propose a model where host niche contraction through geographic isolation and host niche expansion through ecologically equivalent hosts drive cycles of speciation. The role of host race formation and incipient speciation is discussed.
LanguageEnglish
Pages201-215
JournalNew Phytologist
Volume163
Issue number1
DOIs
Publication statusPublished - 2004

Fingerprint

Leccinum
Glyceraldehyde-3-Phosphate Dehydrogenases
Host Specificity
host specificity
Phylogeny
glyceraldehyde-3-phosphate dehydrogenase
North America
phylogeny
niches
host range
internal transcribed spacers

Keywords

  • maximum-likelihood approach
  • molecular clock
  • sequences
  • dna
  • rhizopogon
  • phylogeny
  • biology
  • carbon
  • model
  • amplification

Cite this

den Bakker, H.C. ; Zuccarello, G.C. ; Kuyper, T.W. ; Noordeloos, M.E. / Evolution and host specificity in the ectomycorrhizal genus Leccinum. In: New Phytologist. 2004 ; Vol. 163, No. 1. pp. 201-215.
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Evolution and host specificity in the ectomycorrhizal genus Leccinum. / den Bakker, H.C.; Zuccarello, G.C.; Kuyper, T.W.; Noordeloos, M.E.

In: New Phytologist, Vol. 163, No. 1, 2004, p. 201-215.

Research output: Contribution to journalArticleAcademicpeer-review

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AB - Species of the ectomycorrhizal genus Leccinum are generally considered to be host specialists. We determined the phylogenetic relationships between species of Leccinum from Europe and North America based on second internal transcribed spacer (ITS2) and glyceraldehyde 3-phosphate dehydrogenase (Gapdh). We plotted host associations onto the phylogenies using maximum likelihood and parsimony approaches. Resolution of the phylogeny was greater with Gapdh vs ITS2, plus the Gapdh and ITS phylogenies were highly incongruent. In Leccinum the coding region of Gapdh evolved clocklike, allowing the application of a molecular clock for the reconstruction of host specificity. Almost all species of Leccinum are highly host tree specific, except Leccinum aurantiacum, which associates with a broad range of host trees. Maximum likelihood reconstructions of the ancestral host associations show that this taxon evolved from a specialist. Our results indicate episodes of rapid speciation coinciding with or immediately following host switches. We propose a model where host niche contraction through geographic isolation and host niche expansion through ecologically equivalent hosts drive cycles of speciation. The role of host race formation and incipient speciation is discussed.

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