Molecular phylogenetics and generic assessment in the tribe Pavetteae (Rubiaceae)
Por:
De Block P., Razafimandimbison S.G., Janssens S., Ochoterena H., Robbrecht E., Bremer B.
Publicada:
1 mar 2015
Resumen:
This is the first phylogenetic study focused on the Pavetteae, one of
the most species-rich and morphologically diverse tribes within the
coffee family (Rubiaceae). Fifteen of the 17 currently recognized
genera, represented by 85 taxa, were sequenced for rps16, trnT-F and ITS
and analysed using Bayesian inference and maximum likelihood methods.
The monophyly of the Pavetteae is confirmed. Four major lineages are
identified, but their phylogenetic relationships are not fully resolved.
The continental African genera Rutidea, Nichallea and Tennantia, the
Madagascan genera Homollea and Robbrechtia, and the paleotropical genus
Pavetta are monophyletic. Other genera are paraphyletic in their current
circumscriptions and the following changes are made: Homolliella is
placed in synonymy with Paracephaelis, and Coleactina and Dictyandra
with Leptactina, resulting in four new combinations. The large
paleotropical genus Tarenna is shown not to be monophyletic. In the
future, the name Tarenna should not be used for continental African
species. Most of these could be transferred to the hitherto monospecific
genus Cladoceras, but other species might constitute altogether new
genera. The relationship between the monophyletic Asian-Pacific and
Madagascan Tarenna species remains unclear. The phylogeny of the
Madagascan genera of the Pavetteae is largely unresolved and the largest
Madagascar-centred genus Coptosperma was not recovered as monophyletic.
The low resolution for the Madagascan taxa can be considered as an
indication of rapid radiation. Further molecular and morphological
studies are necessary to clarify the phylogeny of the Pavetteae,
especially regarding the African Tarenna species and the Madagascan
genera of the tribe.
Filiaciones:
De Block P.:
Botanic Garden Meise, Nieuwelaan 38, Meise, 1860, Belgium
Razafimandimbison S.G.:
Bergius Foundation, Royal Swedish Academy of Sciences and Botany Department, Stockholm University, Stockholm, 10691, Sweden
Janssens S.:
Botanic Garden Meise, Nieuwelaan 38, Meise, 1860, Belgium
Ochoterena H.:
Univ Nacl Autonoma Mexico, Inst Biol, Mexico City 04510, DF, Mexico
Robbrecht E.:
Botanic Garden Meise, Nieuwelaan 38, Meise, 1860, Belgium
Bremer B.:
Bergius Foundation, Royal Swedish Academy of Sciences and Botany Department, Stockholm University, Stockholm, 10691, Sweden
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