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Karyotype evolution and speciation of European lilies from Lilium sect. Liriotypus

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Abstract:

The main purpose of this study was to clarify the speciation and taxonomic status of European representatives of Lilium sect. Liriotypus (Lilium albanicum, L. bosniacum, L. bulbiferum, L. candidum, L. carniolicum, L. chalcedonicum, L. jankae, L. pomponium, L. rhodopaeum, L. pyrenaicum) based on karyotype differentiation. Clear interspecific differentiation was revealed among karyotypes of these taxa using fluorochrome (chromomycin and DAPI) bandings, fluorescent in situ hybridization and silver staining. Differences were evident in the number and position of CMA and DAPI bands and in the number, position and activity of 18S-26S and 5S rDNA genes. It is hypothesized that the type species of Lilium sect. Liriotypus, L. candidum, represents the ancestral species from which three evolutionary directions diverged: the first towards L. chalcedonicum, the second towards L. rhodopaeum, and the third towards L. albanicum. The radiation process expanded from L. albanicum, beyond the southeast to the central Dinaric Alps where L. bosniacum is strongly represented. Furthermore, L. carniolicum evolved from northwestern populations of L. bosniacum. According to this evolutionary hypothesis, L. pomponium and L. pyrenaicum would be the youngest species.

Keywords: EUROPEAN ENDEMIC LILIES; KARYOTYPE EVOLUTION; LILIACEAE; LILIUM; LILIUM SECT. LIRIOTYPUS; RDNA AND HETEROCHROMATIN ORGANIZATION

Document Type: Research Article

Affiliations: 1: University of Sarajevo, Faculty of Sciences, Department of Biology, Laboratory for research and protection of endemic resources, Zmaja od Bosne 35, 71 000 Sarajevo, Bosnia and Herzegovina 2: CNRS, University Paris-Sud, AgroParisTech, UMR 8079, Ecologie, Systématique, Evolution, Bât. 360, 91450 Orsay, France

Publication date: 2010-02-01

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