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- Title
An evaluation of tribes and generic relationships in Melioideae (Meliaceae) based on nuclear ITS ribosomal DNA.
- Authors
Muellner, Alexandra N.; Samuel, Rosabelle; Chase, Mark W.; Coleman, Annette; Stuessy, Tod F.
- Abstract
Phylogenetic analyses of Melioideae, including representatives of all currently recognized tribes, were carried out using nuclear ITS ribosomal DNA sequence data. The secondary structure models employed for ITSI and ITS2 allowed optimization of the alignment across Meliaceae genera of both subfarnilies, yielding a maximum amount of information without the exclusion of some highly variable sites. This study is the first to assess the current circumscription of Melioideae and its tribes in detail, with data independ- ent of morphology. Maximum parsimony, maximum likelihood and Bayesian analyses of nuclear ITS, in contrast to analyses based on plastid rbcL, confirm monophyly for Aglaieae, Sandoriceae and Melieae, an isolated position for Vavaeeae, the position of Pterorhachis and Quivisianthe in Melioideae, and a close relationship between Turraeeae and Trichilieae. Trichilieae are morphologically and genetically the most complex tribe. Trichilieae cannot be separated from Turraeeae, Vavaeeae and Sandoriceae. Anthocarapa and "Pseudocarapa" form a dade but exhibit a high number of autapomorphies, which needs further investiga- tion. We propose to keep Naregamia separate from Turraea, and to reconsider the present circumscription of Trichilieae.
- Subjects
MELIACEAE; PHYLOGENY; PLASTIDS; DNA; CLADISTIC analysis; NUCLEOTIDE sequence
- Publication
Taxon, 2008, Vol 57, Issue 1, p98
- ISSN
0040-0262
- Publication type
Article