An evaluation of taxonomic concepts of the widespread plant genus Aglaia and its allies across Wallace's Line (tribe Aglaieae, Meliaceae).
Similar to other species-rich taxa in the Indo-Australian Archipelago, taxonomy of the genus Aglaia (mahogany family, Meliaceae) remains problematic. This study aims to evaluate taxonomic concepts within Aglaia based on the largest dataset to-date. We analyzed sequences of 237 accessions of Aglaia and representatives of all other genera of the tribe Aglaieae, including nuclear ribosomal ITS, the trnL-trnF intron and intergenic spacer, the atpF intron and the petD region comprising the petB-petD spacer, the petD-5' exon and the petD intron (all but the first from the plastid genome). Our analyses were set both in maximum likelihood and Bayesian frameworks, which (1) supported paraphyly of Aglaia and Aphanamixis; (2) demonstrated polyphyly of previously described sections for Aglaia; and (3) suggested delimitation problems with 57% of the morphologically "variable species" and all "complex species". In general, there were more genetic entities than species described, which shows that the taxonomy of this group is more complex than has sometimes been previously assumed. For some species, morphological variation suggests the existence of more variants, subspecies or species within various taxa. Furthermore, our study detected additional phylogenetic entities that were geographically distinct, occurring on either side of Wallace's Line but not on both sides. The delineation of these inter-specific taxa needs further investigation by taking into account the morphological variation within and between populations across the entire distribution.
Biodiversity and Climate Research Centre (BiK-F)/Senckenberg and Goethe University, Department of Systematics, Evolution and Climate Change, Senckenberganlage 25, D-60325 Frankfurt am Main, Germany; Leipzig University, Department of Molecular Evolution and Systematics of Plants, Johannisallee 21-23, D-04103 Leipzig, Germany.
Melanie
M
Grudinski
University of Oxford, Department of Plant Sciences, South Parks Road, Oxford OX1 3RB, UK.
Caroline M
CM
Pannell
Jodrell Laboratory, Royal Botanic Gardens Kew, Richmond, Surrey TW9 3DS, UK; School of Plant Biology, The University of Western Australia, Crawley, WA 6009, Australia.
Mark W
MW
Chase
Brunei National Herbarium (BRUN), Brunei Forestry Centre, Sungai Liang KC 1135, Brunei Darussalam.
Joffre A
JA
Ahmad
Biodiversity and Climate Research Centre (BiK-F)/Senckenberg and Goethe University, Department of Systematics, Evolution and Climate Change, Senckenberganlage 25, D-60325 Frankfurt am Main, Germany; Leipzig University, Department of Molecular Evolution and Systematics of Plants, Johannisallee 21-23, D-04103 Leipzig, Germany. Electronic address: muellner-riehl@uni-leipzig.de.
Alexandra N
AN
Muellner-Riehl
D031602:Aglaia / Q000145:classification* / Q000235:genetics*; D001210:Asia, Southeastern; D001483:Base Sequence; D001499:Bayes Theorem; D018744:DNA, Plant / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000235:genetics; D007438:Introns / Q000235:genetics; D029582:Meliaceae / Q000145:classification* / Q000235:genetics*; D010802:Phylogeny; D017422:Sequence Analysis, DNA
D018744:DNA, Plant; D021903:DNA, Ribosomal Spacer
Aphanamixis; Complex species; Phylogenetics; Sapindales; Southeast Asian floras