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A revised secondary structure model for the internal transcribed spacer 2 of the green algae Scenedesmus and Desmodesmus and its implication for the phylogeny of these algae

Published online by Cambridge University Press:  16 December 2002

ERIK J. VAN HANNEN ,
PATRICK FINK  and
MIQUEL LÜRLING
ERIK J. VAN HANNEN
Affiliation:
Centre for Limnology, Netherlands Institute of Ecology, PO Box 1299, 3600 BG Maarssen, The Netherlands Present address: Limnological Institute, University of Constance, 78457 Konstanz, Germany.
PATRICK FINK
Affiliation:
Centre for Limnology, Netherlands Institute of Ecology, PO Box 1299, 3600 BG Maarssen, The Netherlands Present address: Limnological Institute, University of Constance, 78457 Konstanz, Germany.
MIQUEL LÜRLING
Affiliation:
Centre for Limnology, Netherlands Institute of Ecology, PO Box 1299, 3600 BG Maarssen, The Netherlands Present address: Aquatic Ecology & Water Quality Management Group, Department Environmental Sciences, Wageningen University, PO Box 8080, 6700 DD, Wageningen, The Netherlands.
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Abstract

Secondary structure analysis of 34 internal transcribed spacer 2 (ITS-2) sequences showed that the current model for the green algae Scenedesmus and Desmodesmus is not accurate. In particular, helix I of the currently used model showed considerable deviations from our new model. The newly proposed model is supported by many two-sided compensated base pair changes and fully compensated insertions in all four helices. Phylogenetic analysis by maximum parsimony based on the new alignment confirmed the recent division of the old genus Scenedesmus into the new genera Scenedesmus and Desmodesmus. However, the analysis was not able to show phylogenetic relationships within these two genera. Hence, the ITS-2 region alone is not suitable for clarifying the phylogeny of Scenedesmus and Desmodesmus and new regions have to be found for future sequence analyses.

Keywords

compensating base pair changesDesmodesmusinternal transcribed spacer 2parsimonyphylogenysecondary structure modelScenedesmus
Type
Research Article
Information
European Journal of Phycology , Volume 37 , Issue 2 , May 2002 , pp. 203 - 208
Copyright
© 2002 British Phycological Society

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