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

G. V. Degtjareva; S. J. Casper; F. H. Hellwig; A. R. Schmidt; J. Steiger; D. D. Sokoloff

doi:10.1055/s-2006-924560

Plant Biology, Table of Contents

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

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.

Full Text

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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