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Complete mitochondrial genomes of the three brown algae (Heterokonta: Phaeophyceae) Dictyota dichotoma, Fucus vesiculosus and Desmarestia viridis

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Abstract

We report the complete mitochondrial sequences of three brown algae (Dictyota dichotoma, Fucus vesiculosus and Desmarestia viridis) belonging to three phaeophycean lineages. They have circular mapping organization and contain almost the same set of mitochondrial genes, despite their size differences (31,617, 36,392 and 39,049 bp, respectively). These include the genes for three rRNAs (23S, 16S and 5S), 25–26 tRNAs, 35 known mitochondrial proteins and 3–4 ORFs. This gene set complements two previously studied brown algal mtDNAs, Pylaiella littoralis and Laminaria digitata. Exceptions to the very similar overall organization include the displacement of orfs, tRNA genes and four protein-coding genes found at different locations in the D. dichotoma mitochondrial genome. We present a phylogenetic analysis based on ten concatenated genes (7,479 nucleotides) and 29 taxa. Stramenopiles were always monophyletic with heterotrophic species at the base. Results support both multiple primary and multiple secondary acquisitions of plastids.

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Abbreviations

Mt:

Mitochondrial

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Acknowledgements

We thank S.A. Boele-Bos and J. Veldsink, for technical assistance, as well as G. Hoarau and M. Chevolot for helpful discussions. We also would like to thank two anonymous reviewers for useful comments to improve the manuscript. M.-P. O.-L.S. was supported by a Marie Curie Individual Fellowship (programme “Quality of Life and Management of Living Resources” QLK3-CT-2000-52053).

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Correspondence to Marie-Pierre Oudot-Le Secq.

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Communicated by Ralph Bock

Nucleotide sequence data reported are available in the GenBank databases under the accession numbers AY494079, AY500368 and AY500367.

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Secq, MP.OL., Goër, S.Ld., Stam, W.T. et al. Complete mitochondrial genomes of the three brown algae (Heterokonta: Phaeophyceae) Dictyota dichotoma, Fucus vesiculosus and Desmarestia viridis . Curr Genet 49, 47–58 (2006). https://doi.org/10.1007/s00294-005-0031-4

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