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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Phylogeny, evolutionary trends and classification of the Spathelia-Ptaeroxylon clade: Morphological and molecular insights
Annals of Botany, Volume 107, No. 8, Year 2011
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Description
Background and Aims: The Spathelia-Ptaeroxylon clade is a group of morphologically diverse plants that have been classified together as a result of molecular phylogenetic studies. The clade is currently included in Rutaceae and recognized at a subfamilial level (Spathelioideae) despite the fact that most of its genera have traditionally been associated with other families and that there are no obvious morphological synapomorphies for the clade. The aim of the present study is to construct phylogenetic trees for the Spathelia-Ptaeroxylon clade and to investigate anatomical characters in order to decide whether it should be kept in Rutaceae or recognized at the familial level. Anatomical characters were plotted on a cladogram to help explain character evolution within the group. Moreover, phylogenetic relationships and generic limits within the clade are also addressed. Methods A species-level phylogenetic analysis of the Spathelia-Ptaeroxylon clade based on five plastid DNA regions (rbcL, atpB, trnL-trnF, rps16 and psbAtrnH) was conducted using Bayesian, maximum parsimony and maximum likelihood methods. Leaf and seed anatomical characters of all genera were (re)investigated by light and scanning electron microscopy. Key Results With the exception of Spathelia, all genera of the SpathelilaPtaeroxylon clade are monophyletic. The typical leaf and seed anatomical characters of Rutaceae were found. Further, the presence of oil cells in the leaves provides a possible synapomorphy for the clade. Conclusions The Spathelia-Ptaeroxylon clade is well placed in Rutaceae and it is reasonable to unite the genera into one subfamily (Spathelioideae). We propose a new tribal classification of Spathelioideae. A narrow circumscription of Spathelia is established to make the genus monophyletic, and Sohnreyia is resurrected to accommodate the South American species of Spathelia. The most recent common ancestor of Spathelioideae probably had leaves with secretory cavities and oil cells, haplostemonous flowers with appendaged staminal filaments, and a tracheidal tegmen. © The Author 2011. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved.
Authors & Co-Authors
Appelhans, Marc S.
Netherlands, Leiden
Universiteit Leiden
Smets, Erik F.
Netherlands, Leiden
Universiteit Leiden
Belgium, Leuven
Ku Leuven
Razafimandimbison, Sylvain G.
Sweden, Stockholm
Stockholms Universitet
Haevermans, Thomas
France, Paris
Museum National D'histoire Naturelle
Van Marle, E. J.
Netherlands, Leiden
Universiteit Leiden
Couloux, Arnaud
France, Evry
Genoscope - Centre National de Séquençage
Rabarison, Harison
Madagascar, Antananarivo
Université D'antananarivo
Randrianarivelojosia, Milijaona
Madagascar, Antananarivo
Institut Pasteur de Madagascar
South Africa, Durban
University of Kwazulu-natal
Keßler, P. J.A.
Netherlands, Leiden
Universiteit Leiden
Statistics
Citations: 39
Authors: 9
Affiliations: 8
Identifiers
Doi:
10.1093/aob/mcr076
ISSN:
03057364
Research Areas
Genetics And Genomics