Phylogeny and classification of the tribe Vanguerieae (Rubiaceae)

Vanguerieae is a tribe in the mainly tropical angiosperm family Rubiaceae. The tribe currently comprises around 600 species in 27 genera, with the major part of the species distributed in Africa south of the Sahara. The phylogeny of the tribe was investigated using both molecular and morphological...

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Main Author: Lantz, Henrik
Format: Doctoral Thesis
Language:English
Published: Uppsala universitet, Institutionen för evolutionsbiologi 2003
Subjects:
ITS
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3293
http://nbn-resolving.de/urn:isbn:91-554-5529-8
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spelling ndltd-UPSALLA1-oai-DiVA.org-uu-32932013-01-08T13:03:42ZPhylogeny and classification of the tribe Vanguerieae (Rubiaceae)engLantz, HenrikUppsala universitet, Institutionen för evolutionsbiologiUppsala : Acta Universitatis Upsaliensis2003BiologyVanguerieaeRubiacaeaephylogenyclassificationmorphologyITStrnT-Frpl16BiologiBiologyBiologiVanguerieae is a tribe in the mainly tropical angiosperm family Rubiaceae. The tribe currently comprises around 600 species in 27 genera, with the major part of the species distributed in Africa south of the Sahara. The phylogeny of the tribe was investigated using both molecular and morphological data. ITS sequences of the nuclear ribosomal DNA are used in all of the included papers, and in three papers also in combination with sequences from the plastid trnT-F region and/or the rpl16 intron. Thirty morphological characters were also investigated and used in combination with molecular data. Several strongly supported groups are found, but eight of the currently recognized genera are also revealed as para- or polyphyletic, i.e., Canthium, Fadogia, Lagynias, Pachystigma, Pyrostria, Rytigynia, Tapiphyllum, and Vangueria. A new classification based on the phylogenetic analyses is suggested and a review of the morphology of Vanguerieae with a focus on taxonomically informative characters is also included. The morphologically similar Ancylanthos, Lagynias, Pachystigma, and Tapiphyllum together with a species of Rytigynia, R. fuscosetulosa, are suggested for transfer to Vangueria. All dioecious species of Vanguerieae are found to form a strongly supported group. A study of the group is performed in which all dioecious genera and also twelve undescribed species from Madagascar are included. It is concluded that the whole group should be included in Pyrostria, which necessitates transfers of Canthium subgenus Bullockia and Scyphochlamys. Canthium subgenus Afrocanthium is found to have a position isolated from the type species of the genus and it is suggested that the subgenus is given generic rank as Afrocanthium. A comparison of nuclear and chloroplast phylogenies shows that several species in a subgroup of the tribe have incongruent positions, and possible explanations for the incongruencies are discussed. Doctoral thesis, comprehensive summaryinfo:eu-repo/semantics/doctoralThesistexthttp://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3293urn:isbn:91-554-5529-8Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1104-232X ; 804application/pdfinfo:eu-repo/semantics/openAccess
collection NDLTD
language English
format Doctoral Thesis
sources NDLTD
topic Biology
Vanguerieae
Rubiacaeae
phylogeny
classification
morphology
ITS
trnT-F
rpl16
Biologi
Biology
Biologi
spellingShingle Biology
Vanguerieae
Rubiacaeae
phylogeny
classification
morphology
ITS
trnT-F
rpl16
Biologi
Biology
Biologi
Lantz, Henrik
Phylogeny and classification of the tribe Vanguerieae (Rubiaceae)
description Vanguerieae is a tribe in the mainly tropical angiosperm family Rubiaceae. The tribe currently comprises around 600 species in 27 genera, with the major part of the species distributed in Africa south of the Sahara. The phylogeny of the tribe was investigated using both molecular and morphological data. ITS sequences of the nuclear ribosomal DNA are used in all of the included papers, and in three papers also in combination with sequences from the plastid trnT-F region and/or the rpl16 intron. Thirty morphological characters were also investigated and used in combination with molecular data. Several strongly supported groups are found, but eight of the currently recognized genera are also revealed as para- or polyphyletic, i.e., Canthium, Fadogia, Lagynias, Pachystigma, Pyrostria, Rytigynia, Tapiphyllum, and Vangueria. A new classification based on the phylogenetic analyses is suggested and a review of the morphology of Vanguerieae with a focus on taxonomically informative characters is also included. The morphologically similar Ancylanthos, Lagynias, Pachystigma, and Tapiphyllum together with a species of Rytigynia, R. fuscosetulosa, are suggested for transfer to Vangueria. All dioecious species of Vanguerieae are found to form a strongly supported group. A study of the group is performed in which all dioecious genera and also twelve undescribed species from Madagascar are included. It is concluded that the whole group should be included in Pyrostria, which necessitates transfers of Canthium subgenus Bullockia and Scyphochlamys. Canthium subgenus Afrocanthium is found to have a position isolated from the type species of the genus and it is suggested that the subgenus is given generic rank as Afrocanthium. A comparison of nuclear and chloroplast phylogenies shows that several species in a subgroup of the tribe have incongruent positions, and possible explanations for the incongruencies are discussed.
author Lantz, Henrik
author_facet Lantz, Henrik
author_sort Lantz, Henrik
title Phylogeny and classification of the tribe Vanguerieae (Rubiaceae)
title_short Phylogeny and classification of the tribe Vanguerieae (Rubiaceae)
title_full Phylogeny and classification of the tribe Vanguerieae (Rubiaceae)
title_fullStr Phylogeny and classification of the tribe Vanguerieae (Rubiaceae)
title_full_unstemmed Phylogeny and classification of the tribe Vanguerieae (Rubiaceae)
title_sort phylogeny and classification of the tribe vanguerieae (rubiaceae)
publisher Uppsala universitet, Institutionen för evolutionsbiologi
publishDate 2003
url http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3293
http://nbn-resolving.de/urn:isbn:91-554-5529-8
work_keys_str_mv AT lantzhenrik phylogenyandclassificationofthetribevanguerieaerubiaceae
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