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Paraphyly of Ixora and New Tribal Delimitation of Ixoreae (Rubiaceae): Inference from Combined Chloroplast (rps16,rbcL, andtrnT-F) Sequence Data1
- Source :
- Annals of the Missouri Botanical Garden. 96:146-160
- Publication Year :
- 2009
- Publisher :
- Missouri Botanical Garden Press, 2009.
-
Abstract
- We performed phylogenetic analyses of DNA sequences of three chloroplast markers: rbcL, rps16 ,a ndtrnT-F, to rigorously test the monophyly of competing circumscriptions of the tribe Ixoreae. Several genera traditionally or currently associated with the type genus Ixora L. were included in the analyses. Ixora as currently circumscribed appears paraphyletic, as many other genera are nested within it with strong support: Captaincookia N. Halle ´, Doricera Verdc., Hitoa Nadeaud, Myonima Comm. ex Juss., Sideroxyloides Jacq., Thouarsiora Homolle ex Arenes, and Versteegia Valeton. Further, Aleisanthia Ridl., Aleisanthiopsis Tange, and Greenea Wight & Arn. are more closely related to Ixora and allies than the monotypic genus Scyphiphora C. F. Gaertn. Consequently, Ixoreae fide Andreasen and Bremer (2000) is not monophyletic without an exclusion of Scyphiphora. Ixoreae fide Robbrecht and Manen (2006) is not monophyletic unless Captaincookia and Doricera are included. The monophyly of a morphologically heterogeneous Ixoreae alliance consisting of Ixora and its relatives Aleisanthia, Aleisanthiopsis ,a ndGreenea is, however, strongly supported. In order to recognize monophyletic and morphologically consistent groups, we adopt a narrow circumscription of Ixoreae (including Bemsetia Raf., Captaincookia, Charpentiera Vieill., Doricera, Hitoa, Ixora, Myonima, Pancheria Montrouz., Sideroxyloides, Thouarsiora, Tsiangia But, H. H. Hsue & P. T. Li, and Versteegia), and two new tribes are erected for Aleisanthia + Aleisanthiopsis and Greenea, respectively. The Indo-Malesian Aleisanthieae and the pantropical Ixoreae s. str. are sister groups, and the Southeast Asian Greeneeae is sister to the Ixoreae-Aleisanthieae clade.
- Subjects :
- 0106 biological sciences
Paraphyly
0303 health sciences
biology
Ixoroideae
Ixora
Pantropical
Plant Science
15. Life on land
biology.organism_classification
Southeast asian
Tribe (biology)
010603 evolutionary biology
01 natural sciences
03 medical and health sciences
Monophyly
Sister group
Botany
Ecology, Evolution, Behavior and Systematics
030304 developmental biology
Subjects
Details
- ISSN :
- 00266493
- Volume :
- 96
- Database :
- OpenAIRE
- Journal :
- Annals of the Missouri Botanical Garden
- Accession number :
- edsair.doi...........118e33c69a3784ad84ef2ab6febbad8e