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Phylogenetic position of Dunaliella acidophila (Chlorophyceae) based on ITS and rbcL sequences

Journal of Applied Phycology volume 24, pages 635–639 (2012)Cite this article

Abstract

Dunaliella acidophila is one of the most extreme acidophiles on earth and is able to survive in highly acidic habitats. This characteristic has made this organism the universal model for the study of abiotic stress. Although D. acidophila is currently circumscribed to the subgenus Pascheria within Dunaliella Teodoresco (Chlorophyceae), its taxonomic position has stirred controversy. The comparison of D. acidophila CCAP19/35 internal transcribed spacers (including ITS2 secondary structure analysis) and RuBisCo large subunit (rbcL) sequences with other Dunaliella species confirms that D. acidophila should maintain its phylogenetic position within the genus Dunaliella, suggesting its inclusion within the subgenus Dunaliella. Furthermore, the ITS1 and ITS2 data revealed that D. acidophila was highly divergent from the other freshwater species assessed, D. lateralis, with which it barely shares a 56.8% similarity.

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Acknowledgements

This research was supported by BANGEN-Banco Genético de la Macaronesia (INTERREG-IIIB, MAC/1/C070). We thank the Cabildo de Gran Canaria for allowing the collaboration of the Departamento de Biodiversidad Molecular y Banco de ADN at the Jardín Botánico Canario “Viera y Clavijo”–Unidad Asociada CSIC, and for continuous support to all its research lines. We also thank Dr. Hisayoshi Nozaki (University of Tokyo, Japan) and Dr. Mark A. Buchheim (The University of Tulsa, OK, USA) for their recommendations regarding rbcL primers. Finally, we would like to thank Dr. Matthias Wolf (University of Wuerzburg, Germany) for his help with the software for the ITS2 secondary structure analysis.

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Authors and Affiliations

  1. Departamento de Biotecnología, División de Investigación y Desarrollo Tecnológico, Instituto Tecnológico de Canarias (ITC), Pozo Izquierdo, 35119, Sta. Lucía, Canary Islands, Spain

    Patrícia Assunção, Adelina de la Jara, Laura Carmona, Karen Freijanes & Héctor Mendoza

  2. Departamento de Biodiversidad Molecular y Banco de ADN de la Flora Canaria, Jardín Botánico Canario “Viera y Clavijo”–Unidad Asociada CSIC, Apartado de correos 14, de Tafira Alta, 35017, Las Palmas de Gran Canaria, Canary Islands, Spain

    Ruth Jaén-Molina & Juli Caujapé-Castells

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  1. Patrícia Assunção
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  2. Ruth Jaén-Molina
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Correspondence to Patrícia Assunção or Héctor Mendoza.

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Fig. 1
figure 2

Distance tree obtained with the ITS2 secondary structure analysis of Dunaliella species (see material & methods). (JPEG 223 kb)

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Table 1

Species, culture collections, origin, ITS and rbcL Genbank accession numbers of the strains included in this study. (DOC 95 kb)

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Assunção, P., Jaén-Molina, R., Caujapé-Castells, J. et al. Phylogenetic position of Dunaliella acidophila (Chlorophyceae) based on ITS and rbcL sequences. J Appl Phycol 24, 635–639 (2012). https://doi.org/10.1007/s10811-011-9676-1

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  • DOI: https://doi.org/10.1007/s10811-011-9676-1

Keywords

  • Chlorophyta
  • Dunaliella acidophila
  • Internal transcribed spacer
  • Freshwater
  • rbcL
  • Taxonomy