Molecular evidence in Diplotaxis (Brassicaceae) suggests a Quaternary origin of the Cape Verdean flora

Autor(en): Franzke, Andreas
Samani, Bibi-Rana Sharif
Neuffer, Barbara 
Mummenhoff, Klaus 
Hurka, Herbert
Stichwörter: ADAPTIVE RADIATION; ALLIANCE ASTERACEAE; ARABIDOPSIS; Cape Verdean flora; CHLOROPLAST DNA PHYLOGENY; Diplotaxis (Brassicaceae); DIVERSIFICATION; EVOLUTION; Evolutionary Biology; INTERNAL TRANSCRIBED SPACER; ISLANDS; Molecular dating; NUCLEAR; Phylogeography; Plant Sciences; WOODY SONCHUS
Erscheinungsdatum: 2017
Herausgeber: SPRINGER WIEN
Journal: PLANT SYSTEMATICS AND EVOLUTION
Volumen: 303
Ausgabe: 4
Startseite: 467
Seitenende: 479
Zusammenfassung: 
In comparison with other Macaronesian Islands (e.g., the Canary Islands), the Cape Verde Islands have received little attention in terms of plant molecular phylogenetic studies, which might also elucidate the general floristic history of this archipelago. The Cape Verdean vascular plant flora (ca. 12% endemics) has traditionally been regarded as relict of a former subtropical Tertiary flora. In contrast, it has been postulated more recently that the flora is much younger and of Pleistocene origin. To test these hypotheses, we have produced molecular phylogenies associated with a molecular clock approach, sampling all nine Cape Verdean endemic Diplotaxis taxa and 21 accessions representing the D. harra complex from across its distributional range. Analyzing three molecular markers from the nuclear and chloroplast genome, we provide evidence that the Cape Verdean endemic Diplotaxis originated from North African D. harra populations in Pleistocene times, putatively linked to the genesis of the (western) Sahara. This adds to the emerging picture that the present Cape Verdean flora is of Pleistocene origin.
ISSN: 03782697
DOI: 10.1007/s00606-016-1384-5

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