Molecular phylogeny of small brown algae, with special reference to the systematic position of Caepidium antarcticum (Adenocystaceae, Ectocarpales)

Peters, Akira F. and Ramirez, M. E. (2001) Molecular phylogeny of small brown algae, with special reference to the systematic position of Caepidium antarcticum (Adenocystaceae, Ectocarpales) Crypptogamie. Algologie, 22 (2). pp. 187-200. DOI 10.1016/S0181-1568(01)01062-5.

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Abstract

Nuclear ribosomal DNA (3′-SSU, ITS, 5′-LSU) and plastid-encoded (rbcL and Rubisco spacer) sequences were determined in Caepidium antarcticum and compared to homologous sequences of relatives from Ectocarpales, Scytothamnales, and other brown algae. Plastidial sequences confirmed a previous conclusions from nuclear ribosomal sequences that some taxa with stellate plastids (Asterocladon and relatives) form the closest outgroup to the Ectocarpales as yet identified. To reconcile nomenclature with the clades resolved in recent molecular studies, we propose a subdivision of the Ectocarpales in five families. Plastidial sequences support the recent proposal of Adenocystaceae, and all sequences suggest that Caepidium should be included in this family. As a further result, Geminocarpus was shown to belong to the same clade as Pylaiella and a number of other brown algae with an isomorphic life history and discoid plastids. We recognise this clade, whose correct name is Acinetosporaceae, as another family in the Ectocarpales. We also propose to unite a number of genetically related taxa, which were formely classified in different families, in an extended Chordariaceae. The remaining species of the Ectocarpales belong to Scytosiphonaceae and to Ectocarpaceae, the latter containing only Ectocarpus and Kuckuckia.

Document Type: Article
Keywords: Acinetosporaceae; Adenocystis utricularis; brown algae; Caepidium antarcticum; Chordariaceae; Geminocarpus austro-georgiae; molecular phylogeny; nuclear ribosomal DNA; Phaeophyceae; rbcL; Rubisco spacer; taxonomy; Utriculidium durvillei
Research affiliation: OceanRep > Institute for Marine Science Kiel
Refereed: Yes
DOI etc.: 10.1016/S0181-1568(01)01062-5
ISSN: 0181-1568
Date Deposited: 18 Feb 2008 17:25
Last Modified: 22 Sep 2016 09:17
URI: http://eprints.uni-kiel.de/id/eprint/1321

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