Fungi evolution revisited: Application of the penalized likelihood method to a bayesian fungal phylogeny provides a new perspective on phylogenetic relationships and divergence dates of ascomycota groups

Fungi evolution revisited: Application of the penalized likelihood method to a bayesian fungal phylogeny provides a new perspective on phylogenetic relationships and divergence dates of ascomycota groups

Autor Padovan, ACB Google Scholar
Sanson, GFO Google Scholar
Brunstein, A. Google Scholar
Briones, MRS Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Resumo The depiction of evolutionary relationships within phylum Ascomycota is still controversial because of unresolved branching orders in the radiation of major taxa. Here we generated a dataset of 166 small subunit (18S) rDNA sequences, representative of all groups of Fungi and used as input in a Bayesian phylogenetic analysis. This phylogeny suggests that Discomycetes are a basal group of filamentous Ascomycetes and probably maintain ancestor characters since their representatives are intermingled among other filamentous fungi. Also, we show that the evolutionary rate heterogeneity within Ascomycota precludes the assumption of a global molecular clock. Accordingly, we used the penalized likelihood method, and for calibration we included a 400 million-year-old Pyrenomycete fossil considering two distinct scenarios found in the literature, one with an estimated date of 1576 Myr for the plant-animal-fungus split and the other with an estimated date of 965 Myr for the animal-fungus split. Our data show that the current classification of the fossil as a Pyrenomycete is not compatible with the second scenario. Estimates under the first scenario are older than dates proposed in previous studies based on small subunit rDNA sequences but support estimates based on multiprotein analysis, suggesting that the radiation of the major Ascomycota groups occurred into the Proterozoic era.
Palavra-chave ascomycota evolution
bayesian inference
penalized likelihood
divergence date-estimation
fossil constraint
Idioma Inglês
Data de publicação 2005-06-01
Publicado em Journal of Molecular Evolution. New York: Springer, v. 60, n. 6, p. 726-735, 2005.
ISSN 0022-2844 (Sherpa/Romeo, fator de impacto)
Publicador Springer
Extensão 726-735
Fonte http://dx.doi.org/10.1007/s00239-004-0164-y
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000230077700004
Endereço permanente http://repositorio.unifesp.br/handle/11600/28321

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