title: Morphology and nrITS phylogeny of the genus Pinguicula L. (Lentibulariaceae), with special attention to embryo evolution.
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.
authors.affiliation: Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Leninskie Gory, 119992 Moscow, Russia. degavi@genebee.msu.su
authors.forename: G V
authors.initials: GV
authors.lastname: Degtjareva
authors.forename: S J
authors.initials: SJ
authors.lastname: Casper
authors.forename: F H
authors.initials: FH
authors.lastname: Hellwig
authors.forename: A R
authors.initials: AR
authors.lastname: Schmidt
authors.forename: J
authors.initials: J
authors.lastname: Steiger
authors.forename: D D
authors.initials: DD
authors.lastname: Sokoloff
mesh_terms: D005075:Biological Evolution; D018744:DNA, Plant / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D019684:Magnoliopsida / Q000145:classification* / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D012639:Seeds / Q000033:anatomy & histology* / Q000235:genetics; D017422:Sequence Analysis, DNA
chemical_list: D018744:DNA, Plant; D004275:DNA, Ribosomal