Complete large subunit ribosomal RNA sequences from the heterokont algae ochromonas danica, nannochloropsis salina, and tribonema aequale, and phylogenetic analysis |
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Authors: | Gert Van der Auwera Rupert De Wachter |
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Institution: | (1) Department of Biochemistry, University of Antwerp (UIA), Universiteitsplein 1, B 2610 Antwerpen, Belgium, BE |
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Abstract: | The large subunit ribosomal RNA sequences from the heterokont algae Ochromonas danica, Nannochloropsis salina, and Tribonema aequale were determined. These sequences were combined with small subunit ribosomal RNA sequences in order to carry out a phylogenetic
analysis based on neighbor-joining, maximum parsimony, and maximum likelihood methods. Our results indicate that heterokont
fungi and heterokont algae each are monophyletic, and confirm that they together form a monophyletic group called ``stramenopiles.'
Within the heterokont algae, the eustigmatophyte Nannochloropsis salina either clusters with the chrysophyte Ochromonas danica or forms a sister group to a cluster comprising the phaeophyte Scytosiphon lomentaria and the xanthophyte Tribonema aequale. The alveolates were identified as the closest relatives of the stramenopiles, but the exact order of divergence between the
eukaryotic crown taxa could not be established with confidence.
Received: 22 November 1996 / Accepted: 14 February 1997 |
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Keywords: | : Heterokonta — Stramenopiles — Algae — Eustigmatophytes — Xanthophytes — Chrysophytes — rRNA phylogeny — Nannochloropsis salina— Tribonema aequale— Ochromonas danica |
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