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Plant Systematics and Evolution

, Volume 233, Issue 1–2, pp 79–104 | Cite as

Evolutionary relationships of the New Caledonian heterotrophic conifer, Parasitaxus usta (Podocarpaceae), inferred from chloroplast trnL-F intron/spacer and nuclear rDNA ITS2 sequences

  • W.T. Sinclair
  • R.R. Mill
  • M.F. Gardner
  • P. Woltz
  • T. Jaffré
  • J. Preston
  • M.L. Hollingsworth
  • A. Ponge
  • M. Möller

Abstract.

 The phylogenetic position of Parasitaxus (Podocarpaceae) has been inferred from a cladistic analysis of molecular characters from chloroplast and nuclear genomes including all genera of Podocarpaceae. In all 24 most parsimonious trees, based on combined datasets, Phyllocladus resided outside Podocarpaceae s. str. while Lepidothamnus was basal to the latter. Most other genera were arranged in two major clades. The evidence confirms previous studies, which have suggested a relationship between Lagarostrobos, Manoao and Parasitaxus. Parasitaxus is not directly related to its host Falcatifolium taxoides. Instead it appears to be most closely related to Manoao and Lagarostrobos. No other members of this group now occur on New Caledonia. However, if the evolution of Parasitaxus were autochthonous, a free-living member of this group must once have occurred there. An accelerated evolutionary rate of the chloroplast sequence analysed was suggested, indicating that the plant behaves like a holoparasite.

Key words: Parasitaxus usta, Podocarpaceae, nuclear ITS, chloroplast trnL-F, heterotrophy, molecular phylogeny, New Caledonia. 

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Copyright information

© Springer-Verlag Wien 2002

Authors and Affiliations

  • W.T. Sinclair
    • 1
  • R.R. Mill
    • 2
  • M.F. Gardner
    • 2
  • P. Woltz
    • 3
  • T. Jaffré
    • 4
  • J. Preston
    • 2
  • M.L. Hollingsworth
    • 2
  • A. Ponge
    • 2
  • M. Möller
    • 2
  1. 1.Gene Function and Evolution Section, Department of Plant Biology, The Scottish Agricultural College, Ayr, Scotland, UKGB
  2. 2.Royal Botanic Garden Edinburgh, Edinburgh, Scotland, UKGB
  3. 3.Institut Méditerranéen d'Écologie et de Paléoécologie (IMEP), Faculté des Sciences de St-Jérôme, Marseille, FranceFR
  4. 4.IRD Institut de recherche pour le développement, Nouméa, New CaledoniaNC

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