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Ixora (Rubiaceae) on the Philippines-crossroad or cradle?

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Banag, Cecilia ; Mouly, Arnaud ; Alejandro, Grecebio J. ; Bremer, Birgitta ; Meve, Ulrich ; Grimm, Guido W. ; Liede-Schumann, Sigrid:
Ixora (Rubiaceae) on the Philippines-crossroad or cradle?
In: BMC Evolutionary Biology. Vol. 17 (2017) Issue 1 . - No. 131.
ISSN 1471-2148
DOI der Verlagsversion:

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BackgroundThe Philippine archipelago is globally one of the most important model island systems for studying evolutionary processes. However, most plant species on this archipelago have not yet been studied in sufficient detail. The main aim of this study is to unravel the evolutionary history and biogeographic relationships of the Philippine members of the pantropical genus Ixora.ResultsThe complex plastid and nuclear divergence patterns in Philippine Ixora, documented using tree and network approaches, reveal a highly dynamic evolution in Ixora, involving several phases of radiation and recolonization. Philippine Ixora comprises at least five lineages, of which one is most closely related to species from Wallacea, and the remaining four to species from Asia.ConclusionsOur study highlights the importance of Philippine species for understanding phytogeographic patterns in the Indomalayan-Australasian eco-region. The overall genetic differentiation, as well as the incongruence between genealogies based on the biparentally inherited nucleome and the maternally inherited plastome in Ixora, reflect the complex tectonic history of the Philippine archipelago. The Ixora lineage related to Wallacean species supports the delimitation of different ecozones along Huxley’s line, because it is absent from Palawan. The remaining four lineages are all allied with Asian taxa, reflecting several waves of colonization. Close relationships between some widespread Philippine species and locally adapted narrow endemics suggest that the widespread, genetically diverse species act as pools for the formation of new species in a process of ongoing speciation. Our results suggest that the species concepts of some of the more widespread taxa need to be revised.

Further data

Item Type: Article in a journal
Additional notes (visible to public): BAYCEER141337
Keywords: Huxley’s line; Ixora; Philippines; Rubiaceae; Wallace’s line; Incomplete lineage sorting; Incongruent genealogies; Island biogeography; Molecular systematics; Phylogeny
DDC Subjects: 500 Science
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Systematics > Chair Plant Systematics - Univ.-Prof. Dr. Sigrid Liede-Schumann
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Systematics
Language: English
Originates at UBT: Yes
Date Deposited: 20 Aug 2018 09:36
Last Modified: 29 Jun 2020 10:53


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