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Group I Intron Versus its Sequences in Phylogeny of Cetrarioid Lichens

Published online by Cambridge University Press:  28 March 2007

Arne Thell
Arne Thell
Affiliation:
Department of Systematic Botany, Lund University, Ö. Vallgatan 18–20, 5–223 61 Lund, Sweden.
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Abstract

Phylogenetic trees based on group I intron sequences and on internal transcribed spacer (ITS) sequences of mycobiont ribosomal genes were calculated and compared. Eight cetrarioid and four non-cetrarioid species of the Parmeliaceae were compared. The phylogeny based on group I intron sequences is partly congruent with the ITS sequence phylogeny. Group I intron sequences are presumably less informative for infragenic studies. The introns have a length of 214–233 nucleotides, and differ at up to 33% of the bases between species. All introns analysed are located between the positions 1516 and 1517 of the fungal 18S ribosomal RNA gene. Cetrarioid lichens form a non-homogeneous group within the Parmeliaceae according to both group I intron and ITS sequences.

Type
Research Article
Information
The Lichenologist , Volume 31 , Issue 5 , September 1999 , pp. 441 - 449
Copyright
Copyright © British Lichen Society 1999

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