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Molecular phylogenetic analysis of the tribe Alberteae (Rubiaceae), with description of a new genus, Razafimandimbisonia
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
2009 (English)In: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 58, no 3, 757-768 p.Article in journal (Refereed) Published
Abstract [en]

The tribe Alberteae, presently classified in the subfamily Ixoroideae (Rubiaceae), has historically been an artificial grouping of genera. In the present study, phylogenetic analyses of the chloroplast DNA markers rbcL, ndhF, trnS-G, trnT-F and trnH-psbA as well as the ITS region of the nuclear ribosomal DNA, are done to assess the delimitation of Alberteae. The resulting phylogenetic hypothesis is highly resolved, with most clades strongly supported. The genus Alberta is found to be paraphyletic as presently circumscribed. As a consequence, we propose the new genus Razafimandimbisonia Kainul. & B. Bremer to accommodate the Malagasy species. The newly delimited Alberta is distinguished by having two calycophylls that expand after anthesis as well as awl-shaped stigma lobes. Razafimandimbisonia is distinguished from the remaining Alberteae by having dehiscent fruits and anthers without basal appendages. We demonstrate that the genera Airosperma, Boholia and Crossopteryx are not associated with Alberteae, as has previously been suggested. Alberteae is considered restricted to the genus Alberta endemic to Southeast Africa, and the two Malagasy endemic genera Nematostylis and Razafimandimbisonia.

Place, publisher, year, edition, pages
Wien: International Association for Plant Taxonomy , 2009. Vol. 58, no 3, 757-768 p.
Keyword [en]
Airosperma, Alberta, Boholia, cpDNA, Crossopteryx, Madagascar, Nematostylis, Rubiaceae
National Category
Biological Systematics
Research subject
Systematic Botany
Identifiers
URN: urn:nbn:se:su:diva-35237ISI: 000269774900006OAI: oai:DiVA.org:su-35237DiVA: diva2:286835
Available from: 2010-01-15 Created: 2010-01-15 Last updated: 2017-12-12
In thesis
1. Evolution and biodiversity of the Ixoroideae (Rubiaceae)
Open this publication in new window or tab >>Evolution and biodiversity of the Ixoroideae (Rubiaceae)
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The phylogenetic relationships within subfamily Ixoroideae of the coffee family are investigated by phylogenetic reconstruction of molecular data, including regions of the chloroplast DNA (matK, ndhF, rbcL, rps16, trnH-psbA, trnS-G, and trnT-F), and the nuclear ribosomal DNA (ITS). The evolution of morphological characters within the group are inferred, with focus on characters used in classification. Ixoroideae have primarily been characterized by secondary pollen presentation, contorted corolla aestivation, and fleshy fruits. Secondary pollen presentation appears synapomorhic of a clade comprising the Ixoroideae crown group together with Retiniphyllum, whereas contorted corolla aestivation has evolved earlier and is synapomorphic for the crown group, Retiniphyllum, and Steenisia. Capsules likely represent a plesiomorphy from which various dry or fleshy indehiscent fruits have evolved independently in different clades. Reductions in seed number have also occured in many clades, none of which shows a secondary increase in the number of seeds.

Within Ixoroideae, the phylogeny and tribal delimitations of Alberteae and Condamineeae are studied in more detail. The former appears restricted to Alberta, Nematostylis, and Razafimandimbisonia, a new genus described here. The Condamineeae are a diverse tribe largely unresolved in previous molecular phylogenetic studies. Our results support a synonymization of both Calycophylleae and Hippotideae, because these are nested within the Condamineeae. Ancestral state reconstructions indicate that intrapetiolar stipules, poricidal anthers, and protogyny, otherwise uncommon characters in Rubiaceae, all have evolved more than once in the Condamineeae.

The rare genera Jackiopsis, Glionnetia, and Trailliaedoxa previously not included in molecular phylogenetic analyses, are all found nested within the Ixoroideae, and their systematic positions are discussed. The genera Bathysa, Calycophyllum, Elaeagia, and Rustia do not appear monophyletic. Consequently, resurrections of the names Holtonia, Schizocalyx, and Semaphyllanthe, and synonymizations of Phitopis (as Schizocalyx) and Tresanthera (as Rustia) are proposed. Also proposed are five new tribal names for clades that are not associated with any previously described tribes in the phylogenetic hypotheses presented.

Place, publisher, year, edition, pages
Stockholm: Department of Botany, Stockholm University, 2010. 28 p.
Keyword
Alberteae, character evolution, classification, Condamineeae, fruit evolution, Ixoroideae, phylogenetics, pollen presentation, Rubiaceae, systematics, taxonomy
National Category
Biological Systematics
Research subject
Plant Systematics
Identifiers
urn:nbn:se:su:diva-48850 (URN)978-91-7447-198-4 (ISBN)
Public defence
2011-01-14, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.Available from: 2010-12-22 Created: 2010-12-09 Last updated: 2010-12-14Bibliographically approved

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