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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 phylogen of these algae

Van Hannen, E.J. and Fink, P. and Lürling, M. (2002) A revised secondary structure model for the internal transcribed spacer 2 of the green algae Scenedesmus and Desmodesmus and its implication for the phylogen of these algae. European Journal of Phycology, 37, 203-208. ISSN 0967-0262.

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Official URL: http://dx.doi.org/10.1017/S096702620200361X

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 phlogeny of Scenedcsmus and Desmodesmus and new regions have to be found for future sequence analyses. [KEYWORDS: compensating base pair changes; Desmodesmus; internal transcribed spacer 2; parsimony; phylogeny; secondary structure model; Scenedesmus]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11241
Deposited On:24 Nov 2011 01:00
Last Modified:31 Mar 2014 11:07

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