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  4. Cytogeography of Gentianaceae–Exaceae in Africa, with a special focus on <i>Sebaea</i>: the possible role of dysploidy and polyploidy in the evolution of the tribe
 
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Cytogeography of Gentianaceae–Exaceae in Africa, with a special focus on <i>Sebaea</i>: the possible role of dysploidy and polyploidy in the evolution of the tribe

Auteur(s)
Kissling, Jonathan 
Institut de biologie 
Editeur(s)
Zeltner, Louis
Küpfer, Philippe 
Institut de biologie 
Mansion, Guilhem
Date de parution
2008
In
Botanical Journal of the Linnean Society, Wiley, 2008/158/3/556-566
Mots-clés
  • chromosome numbers

  • <i>Exacum</i>

  • <i>karyology</i>

  • <i>Ornichia</i>

  • <i>Tachiadenus</i>

Résumé
Unlike other tribes of Gentianaceae, Exaceae have so far received little attention regarding their karyological evolution. Indeed, only 35 chromosome number counts (19 species) have been referenced to date, representing only a negligible fraction of the tribal diversity. In this paper, we performed an intensive chromosome count on material collected in the field (South and central Africa, plus Madagascar), encompassing 155 populations and c. 60 species from four genera of <i>Exaceae</i>, including <i>Exacum</i>, <i>Ornichia</i>, <i>Sebaea</i> and <i>Tachiadenus</i>. Fifty nine species (14 <i>Exacum</i>, one <i>Ornichia</i>, 42 <i>Sebaea</i> and two <i>Tachiadenus</i>) were examined for the first time, revealing a broad set of chromosome numbers (2n = 18, 28, 32, 36, 42, 56) and the occurrence of polyploid systems within <i>Exacum</i> and <i>Sebaea</i>. These results allow us to postulate x = 7, 8 or 9 as possible base chromosome numbers for Exaceae and emphasize the importance of both dysploidy and polyploidy processes in the evolution of the tribe. Finally, chromosome numbers appear to be associated to some morphological or geographical traits, suggesting new systematic combinations and likely active speciation patterns in the group.
URI
https://libra.unine.ch/handle/123456789/15179
DOI
10.1111/j.1095-8339.2008.00888.x
Autre version
http://dx.doi.org/10.1111/j.1095-8339.2008.00888.x
Type de publication
Resource Types::text::journal::journal article
Dossier(s) à télécharger
 main article: Kissling_Jonathan_-_Cytogeography_of_Gentianaceae-Exaceae_20090721.pdf (416.87 KB)
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