Zusammenfassung
To reconstruct the evolutionary history of the polyploid southern and central European genus Leucanthemum, comprising 41 species with ploidy levels ranging from 2x to 22x, we analysed chloroplast DNA sequence variation (psbA-trnH and trnL-trnF intergenic spacer regions) of 106 representatives belonging to 30 species and 41 taxa. In an unrooted haplotype network, which shows internal (ancestral) ...
Zusammenfassung
To reconstruct the evolutionary history of the polyploid southern and central European genus Leucanthemum, comprising 41 species with ploidy levels ranging from 2x to 22x, we analysed chloroplast DNA sequence variation (psbA-trnH and trnL-trnF intergenic spacer regions) of 106 representatives belonging to 30 species and 41 taxa. In an unrooted haplotype network, which shows internal (ancestral) haplotypes that are mainly represented by diploid taxa (L. gallaecicum, L. gracilicaule, L. halleri, L. laciniatum, L. lithopolitanicum, L. rotundifolium, and L. tridactylites), we identified three major haplotype groups (HTGs) containing diploid and polyploid species. Whereas HTG I contains most of the polyploid taxa of the genus, with a single diploid species from the SW Alps (L. virgatum), HTG II consists of four diploid (L. burnatii, L. gaudinii, L. graminifolium, and L. vulgare) and six polyploid species, and HTG III comprises one diploid (L. pluriflorum) and three polyploid species endemic to the NW part of the Iberian Peninsula. We also further found evidence for recurrent formation of at least three polyploid taxa (i.e., L. delabrei, L. ircutianum subsp. cantabricum, and L. pallens).
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