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Plant Biol (Stuttg) 2006; 8(6): 778-790
DOI: 10.1055/s-2006-924560
Research Paper

Georg Thieme Verlag Stuttgart KG · New York

Morphology and nrITS Phylogeny of the Genus Pinguicula L. (Lentibulariaceae), with Special Attention to Embryo Evolution

G. V. Degtjareva1 , S. J. Casper2 , F. H. Hellwig2 , A. R. Schmidt2 , 3 , J. Steiger4 , D. D. Sokoloff5
  • 1Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Leninskie Gory, 119992 Moscow, Russia
  • 2Institut für Spezielle Botanik, Friedrich-Schiller-Universität Jena, Philosophenweg 16, 07743 Jena, Germany
  • 3Present address: Museum für Naturkunde der Humboldt-Universität zu Berlin, Institut für Paläontologie, Invalidenstraße 43, 10115 Berlin, Germany
  • 4IAWF, University of Bern, Inselspital 37a, 3010 Bern, Switzerland
  • 5Higher Plants Department, Biological Faculty, Lomonosov Moscow State University, Leninskie Gory, 119992 Moscow, Russia
Weitere Informationen

Publikationsverlauf

Received: October 4, 2005

Accepted: August 8, 2006

Publikationsdatum:
23. Oktober 2006 (online)

   Lizenzen und Reprints

Abstract

The genus Pinguicula (Lentibulariaceae) is unusual within the dicot order Lamiales because of the occurrence of both embryos with two cotyledons and those with just one cotyledon. In order to elucidate the infrageneric relationships and the evolutionary history of the embryo, we analysed (1) the internal transcribed spacers ITS1 and ITS2 of the nuclear ribosomal DNA (nrITS) of 29 Old and New World taxa of Pinguicula, and (2) the morphological and anatomical characters of the seeds. We suggest that the cotyledon number and spermoderm structure were quite unstable in the evolution of Pinguicula. Although basal nodes of the nrITS tree are sensitive to taxon sampling, all tree topologies found in this study imply homoplasy in the cotyledon number.

Key words

Carnivorous plants - Lentibulariaceae - Pinguicula - nrITS phylogeny - embryo evolution.

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G. V. Degtjareva

Faculty of Bioengineering and Bioinformatics
Lomonosov Moscow State University

Leninskie Gory

119992 Moscow

Russia

eMail: degavi@genebee.msu.su

Guest Editor: S. Porembski