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Phylogenetic relationships of Stereocaulaceae based on simultaneous analysis of beta-tubulin, GAPDH and SSU rDNA sequences

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Abstract:

The phylogenetic relationships of the lichenised ascomycete family Stereocaulaceae were investigated with partial beta-tubulin, partial glyceraldehyde 3-phosphate dehydrogenase (GAPDH) and SSU rDNA sequence data. Due to the marked length variation in the SSU rDNA sequences, the analyses were performed with direct optimization. The combined analysis of the beta-tubulin, GAPDH and SSU rDNA sequences as well as the separate analyses of beta-tubulin and GAPDH data recognized the monophyletic group comprising Lepraria, Muhria and Stereocaulon. In the combined analysis Stereocaulon tornense appears as a basal taxon in the Stereocaulon clade, suggesting that the crustose growth form and the absence of cephalodia are primitive features within the genus. Muhria is nested in Stereocaulon and groups with the crustose S. cumulatum and S. leucophaeopsis. The genus Lepraria is monophyletic if Leproloma is included, but species that were represented by several specimens in our study, i.e., Lepraria jackii and Leproloma membranaceum, do not appear as monophyletic entities. The genus Pilophorus is included in Cladoniaceae. Combined analysis of the three datasets clearly led to an increase in support values compared to the separate analyses, showing high support for the monophyly of families Cladoniaceae and Stereocaulaceae and for the sistergroup relation for the two families. The relationships between higher groupings did not reach high support values probably due to the incongruencies among the three datasets.

Keywords: BETA-TUBULIN; GAPDH; LEPRARIA; OPTIMIZATION ALIGNMENT; PHYLOGENY; SSU RDNA; STEREOCAULACEAE; STEREOCAULON

Document Type: Research Article

Affiliations: 1: Botanical Museum, Finnish Museum of Natural History, P.O. Box 7, FIN-00014 University of Helsinki, Finland 2: Botanical Museum, Finnish Museum of Natural History, P.O. Box 7, FIN-00014 University of Helsinki, Finland; Division of Systematic Biology, P.O. Box 65, FIN-00014 University of Helsinki, Finland 3: Botanical Museum, Lund University, Östra Vallgatan 18, SE-223 61 Lund, Sweden 4: Division of Systematic Biology, P.O. Box 65, FIN-00014 University of Helsinki, Finland

Publication date: August 1, 2005

iapt/tax/2005/00000054/00000003/art00002
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