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Küpfer, Philippe

Nom
Küpfer, Philippe
Affiliation principale
Fonction
Professeur honoraire
Email
philippe.kuepfer@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/301

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  • Publication
    Accès libre
    Chromosomal evolution of Gentiana and Jaeschkea (Gentianaceae), with further documentation of chromosome data for 35 species from western China
    (1998)
    Yuan, Yong-Ming
    ;
    Küpfer, Philippe 
    ;
    Zeltner, Louis
    Chromosome numbers were recorded for 63 populations of 34 species belonging to the genus Gentiana from the high altitude regions of western China. Counts for 22 species were reported for the first time and new numbers were found for G. heleonastes (2n = 36), G. prattii (2n = 20) and G. pseudoaquatica (2n = 40). Incorporating previous data, a complete series of gametic chromosome numbers from n = 6 to 24 and 26 was established for the genus, suggesting rapid karyotypic evolution by a combination of dysploidy and polyploidy. The cytotype 2n = 20 is proposed as the ancestral type in sect. Chondrophyllae s. l. The chromosome number 2n = 16 was found for Jaeschkea microsperma for the first time which, with previous reports of 2n = 18, 20 and 22, indicates that Jaeschkea is a typically dysploid genus.
  • Publication
    Accès libre
    The monophyly and rapid evolution of Gentiana sect. Chondrophyllae Bunge s.l. (Gentianaceae): evidence from the nucleotide sequences of the internal transcribed spacers of nuclear ribosomal DNA
    (1997)
    Yuan, Yong-Ming
    ;
    Küpfer, Philippe 
    The nucleotide sequences of the internal transcribed spacers (ITS) of nuclear ribosomal DNA of 24 representative species of sect. Chondrophyllae s.l. have been determined and analysed phylogenetically, together with some species of other sections of the genus Gentiana. The ITS sequences strongly support the monophyly of the sect. Chondrophyllae s.l. as a whole complex including various different dysploid cytotypes. Species, such as G. boryi and G. pyrenaica, that had been split into distinct genera by some cytotaxonomists have been proven to be closely related. However, the ITS sequences do not provide sufficient information to make a robust estimation of the phylogenetic relationships among the closely related species and dysploid cytotypes of the complex, beyond recognizing their monophyly and rapid evolution.