Molecular biogeography and evolution of the Microthlaspi perfoliatum sl polyploid complex (Brassicaceae): chloroplast DNA and nuclear ribosomal DNA restriction site variation

Autor(en): Koch, M
Mummenhoff, K 
Hurka, H
Stichwörter: biogeography; chloroplast DNA; DIVERSITY; GENERA SUBTRIBE BRASSICINAE; GENOME; INTERGENIC SPACER REGION; Microthlaspi perfoliatum polyploid complex; molecular phylogeny; nuclear ribosomal DNA; NUCLEOTIDE-SEQUENCE; ORIGIN; PHYLOGENETIC-RELATIONSHIPS; Plant Sciences; RNA GENE; SAXIFRAGACEAE; SYSTEMATICS
Erscheinungsdatum: 1998
Herausgeber: NATL RESEARCH COUNCIL CANADA
Journal: CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
Volumen: 76
Ausgabe: 3
Startseite: 382
Seitenende: 396
Zusammenfassung: 
The genus Thlaspi L. s.l. comprises numerous segregate lineages, which have been recognized as single genera. One of these, Microthlaspi, represents one such segregate. It consists of morphologically similar annual species. The species have different ploidy levels (2x, 4x, 6x) and are usually summarized cinder the designation Thlaspi perfoliatum agg, The assumed ancestral diploid members of the species complex, Microthlaspi granatense (Boiss. & Reut.) F.K. Meyer, Microthlaspi umbellatum (Steven ex DC.) F.K. Meyer, and Microthlaspi natolicum (Boiss.) F.K. Meyer, are restricted to northwestern Africa, southeastern Spain and Turkey, northern Iran, and Lebanon. Microthlaspi perfoliatum (L.) F.K. Meyer is widely distributed all over Europe and shows three ploidy levels. Diploid M. perfoliatum is restricted to Middle Europe, whereas tetraploid and hexaploid M. perfoliatum are distributed all over Europe. Individual plants from 125 natural populations throughout the geographic range were analysed using chloroplast DNA (cpDNA) and nuclear ribosomal DNA (nrDNA) restriction site analysis. Within Microthlaspi, 31 cpDNA restriction site mutations, six nrDNA restriction site variations, and two length mutations in the IGS region of the nrDNA were found, and a molecular phylogeny of the species complex has been derived. Polymorphisms in molecular data partitioned cytotypes of M. perfoliatum. The geographical distribution patterns apparently reflect ancient speciation processes and postglacial vegetation history.
ISSN: 00084026
DOI: 10.1139/b98-006

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