Titre
Malagasy Dracaena Vand. ex L. (Ruscaceae): an investigation of discrepancies between morphological features and spatial genetic structure at a small evolutionary scale
Type
article
Institution
Externe
Périodique
Auteur(s)
Buerki, S.
Auteure/Auteur
Callmander, M.W.
Auteure/Auteur
Schuepfer, F.
Auteure/Auteur
Ravokatra, M.
Auteure/Auteur
Kuepfer, P.
Auteure/Auteur
Alvarez, N.
Auteure/Auteur
Liens vers les personnes
ISSN
0378-2697
Statut éditorial
Publié
Date de publication
2009
Volume
280
Numéro
1-2
Première page
15
Dernière page/numéro d’article
28
Peer-reviewed
Oui
Langue
anglais
Résumé
Malagasy Dracaena (Ruscaceae) are divided into four species and 14 varieties, all of them showing a high level of morphological diversity and a putatively artefactual circumscription. In order to reveal relationships between those entangled entities, a span of Malagasy Dracaena were sampled and analyzed using cpDNA sequences and AFLP. The cpDNA analyses resolved three biogeographic clades that are mostly inconsistent with morphology, since similar phenotypes are found across the three clades. Bayesian inference clustering analyses based on the AFLP were not in accordance with the cpDNA analysis. This result might be explained by ( 1) a recent origin of the Malagasy species of Dracaena with an incomplete sorting of chloroplast lineages; ( 2) a high amount of hybridizations; ( 3) a complex migration pattern. Interestingly, when the AFLP are analyzed using the parsimony criterion, a trend towards a directional evolution of inflorescence types and ecological features was observed. This might be considered either as phenotypic plasticity and/or as the result of fast evolution in flower characters according to habitat preferences. Overall, our results point to the difficulty of defining evolutionarily significant units in Malagasy Dracaena, emphasizing the complex speciation processes taking place in tropical regions.
PID Serval
serval:BIB_BDE5F16EFE2B
Date de création
2010-04-18T10:27:59.155Z
Date de création dans IRIS
2025-05-21T00:20:43Z