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Molecular phylogenetic studies within the Xylariaceae based on ribosomal DNA sequences

AutorPeláez, Fernando; González, Vicente; Platas, Gonzalo; Sánchez Ballesteros, Javier; Rubio, Víctor
Palabras claveAscomycetes
Bayesian analysis
ITS phylogeny
Maximum-likelihood analysis
Neighbor-Joining analysis
Parsimony analysis
Fecha de publicación31-jul-2008
CitaciónFungal Diversity: an international journal of mycology 31:111-134 (2008)
ResumenThe Xylariaceae (Xylariales, Ascomycota) are considered one of the largest families of filamentous Ascomycetes. To infer the evolutionary relationships of some genera considered within the Xylariaceae, the 5.8S rRNA gene and ITS2 sequences of 100 isolates covering 15 genera and 62 taxa, were analysed phylogenetically. To obtain an accurate view on the evolutionary relationships of genera within Xylariaceae, four different sequence analysis methods (i.e. Parsimony, Neighbor-joining, Maximum-likelihood and Bayesian analyses) were employed, and a consensus phylogram was obtained to integrate data from all these mentioned approaches. Rates of congruence between topologies of the trees generated were also estimated by different methods. The phylogenetic reconstructions showed a reasonable degree of correlation between the sequence data and the proposed morphological classification schemes only for some genera within the family. The Hypoxylon-related genera included in the study (i.e. Hypoxylon, Annulohypoxylon, Biscogniauxia, Camillea, Creosphaeria, Whalleya and Daldinia) appeared closely related within a large clade in all the trees. Nemania always clusters apart from this clade of Hypoxylon-related genera, often found at the base of the tree. Phylogenetic reconstruction supported a polyphyletic origin for the genera Xylaria and Rosellinia, suggesting that these must be considered as large and complex genera, made up of a mixture of weakly related species. Kretzschmaria and Stilbohypoxylon appeared to be highly related to some Xylaria species. Finally, Entoleuca seems to be closely related to Rosellinia. In summary, this study suggests the need for further revision of the generic concepts and diagnostic characters within the Xylariaceae.
Descripción24 pages, and figures, and tables.
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