Skip to Main Content
Inferences on the phylogeography of the fungal pathogen Heterobasidion annosum, including evidence of interspecific horizontal genetic transfer and of human-mediated, long-range dispersalAuthor(s): R.E. Linzer; W.J. Otrosina; P. Gonthier; J. Bruhn; G. Laflamme; G. Bussieres; M. Garbelotto
Source: Molecular Phylogenetics and Evolution, 46: 844-862
Publication Series: Miscellaneous Publication
PDF: Download Publication (489 KB)
DescriptionFungi in the basidiomycete species complex Heterobasidion annosum are significant root-rot pathogens of conifers throughout the northern hemisphere. We utilize a multilocus phylogenetic approach to examine hypotheses regarding the evolution and divergence of two Heterobasidion taxa associated with pines: the Eurasian H. annosum sensu stricto and the North American H. annosum P intersterility group (ISG). Using DNA sequence information from portions of two nuclear and two mitochondrial loci, we infer phylogenetic relationships via parsimony, Bayesian and median-joining network analysis. Analysis of isolates representative of the entire known geographic range of the two taxa results in monophyletic sister Eurasian and North American lineages, with North America further subdivided into eastern and western clades. Genetically anomalous isolates from the Italian presidential estate of Castelporziano are always part of a North American clade and group with eastern North America, upholding the hypothesis of recent, anthropogenically mediated dispersal. P ISG isolates from Mexico have phylogenetic affinity with both eastern and western North America. Results for an insertion in the mitochondrial rDNA suggest this molecule was obtained from the Heterobasidion S ISG, a taxon sympatric with the S ISG in western North America. These data are compatible with an eastern Eurasian origin of the species, followed by dispersal of two sister taxa into western Eurasia and into eastern North America over a Beringean land bridge, a pattern echoed in the phylogeography of other conifer-associated basidiomycetes.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationLinzer, R.E.; Otrosina, W.J.; Gonthier, P.; Bruhn, J.; Laflamme, G.; Bussieres, G.; Garbelotto, M. 2008. Inferences on the phylogeography of the fungal pathogen Heterobasidion annosum, including evidence of interspecific horizontal genetic transfer and of human-mediated, long-range dispersal. Molecular Phylogenetics and Evolution, 46: 844-862
KeywordsBasidiomycota, biogeography, Eurasia, North America, intersterility group, median-joining network, Pinus, phylogeny, phylogeography
- The human and fire connection
- Humans in changing shrubland ecosystems
- Human land uses reduce climate connectivity across North America
XML: View XML