Journal Article

PreJuSER-40671

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Phylogeny of the Hydrodictyaceae (Chlorophyceae): Inferences from rDNA data

Buchheim, M. ; Buchheim, J. ; Carlson, T. ; Braband, A. ; Hepperle, D. ; Krienitz, L. ; Wolf, M. ; Hegewald, E.FZJ*

2005
Wiley-Blackwell Oxford [u.a.]

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Please use a persistent id in citations: doi:10.1111/j.1529-8817.2005.00129.x

Abstract: The hydrodictyacean green algal lineage has been the focus of much research due to the fossil record of at least some members, their ornamented cell walls, and their distinctive reproductive strategies. The phylogeny of the family was, until recently, exclusively morphology based. This investigation examines hydrodictyacean isolates from several culture collections, focusing on sequences from ribosomal data: 18S rDNA, 26S rDNA (partial), and internal transcribed spacer (ITS)-2 data. Results from phylogenetic analyses of independent and combined data matrices support the Hydrodictyaceae as a monophyletic lineage that includes isolates of Chlorotetraedron, Hydrodictyon, Pediastrum, Sorastrum, and Tetraedron. Phylogenetic analyses of rDNA data indicate that the three-dimensional coenobium of Hydrodictyon is evolutionarily distinct from the three-dimensional coenobium of Sorastrum. The more robust aspects of the ITS-2 data corroborate the 18S+26S rDNA topology and provide a structural autapomorphy for the Hydrodictyaceae and Neochloridaceae, that is, an abridgment of helix IV in the secondary structure. The rDNA data do not support monophyly of Pediastrum but rather suggest the existence of four additional hydrodictyacean genera: Monactinus, Parapediastrum, Pseudopediastrum, and Stauridium.

Keyword(s): 18S rDNA (auto) ; 26S rDNA (auto) ; Chlorotetraedron (auto) ; comb. nov. (auto) ; gen. nov. (auto) ; Hydrodictyon (auto) ; ITS-2 (auto) ; molecular systematics (auto) ; Monactinus (auto) ; Parapediastrum (auto) ; Pediastrum (auto) ; phylogeny (auto) ; Pseudopediastrum (auto) ; Sorastrum (auto) ; Stauridium (auto) ; Tetraedron (auto)

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Phytosphäre (ICG-III)

Research Program(s):

1. Chemie und Dynamik der Geo-Biosphäre (U01)

Appears in the scientific report 2005

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