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Phylogenetic relationships of Scenedesmus and Acutodesmus (Chlorophyta, Chlorophyceae) as inferred from 18S rDNA and ITS-2 sequence comparisons

Abstract.

The complete 18S rDNA and ITS-2 sequences of two strains of Scenedesmus arcuatus were determined and subjected to phylogenetic analyses. Furthermore, ITS-2 sequences of Scenedesmus obtusus, of S. hindakii, and of Acutodesmus regularis were investigated. Phylogenetic analyses indicated that S. hindakii is most closely related to S. raciborskii and/or S. obtusus, embedded in the Scenedesmuscluster. The morphologically similar S. arcuatus and its variety platydiscus branched outside the Scenedesmus/Acutodesmus cluster (18S) or together with A. regularis and A. pectinatus (ITS-2). Therefore, the genera Acutodesmus and/or Scenedesmus are paraphyletic. S. arcuatus is not closely related to S. hindakii.

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Correspondence to E. Hegewald.

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We thank Dipl. Biol. Anke Braband and Dr. R. Hiesel (both Berlin, Germany) for sequencing, Mrs. Gertrud Popowytsch (Jülich, Germany) for preparing Fig. 3, Mrs. Janet Carter-Sigglow, MA, for proofreading the English, and Dr. P. Tsarenko for helpful comments on the manuscript.

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Hegewald, E., Wolf, M. Phylogenetic relationships of Scenedesmus and Acutodesmus (Chlorophyta, Chlorophyceae) as inferred from 18S rDNA and ITS-2 sequence comparisons. Plant Syst. Evol. 241, 185–191 (2003). https://doi.org/10.1007/s00606-003-0061-7

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  • DOI: https://doi.org/10.1007/s00606-003-0061-7

Keywords

  • Euphorbia
  • succulents
  • subsect.
  • Meleu-phorbia
  • phylogeny
  • ITS-region
  • atpB-rbcL IGS promoter
  • South Africa.