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Deep divergences in the coffee family and the systematic position of Acranthera


Rydin, C; Kainulainen, K; Razafimandimbison, S G; Smedmark, J E E; Bremer, B (2009). Deep divergences in the coffee family and the systematic position of Acranthera. Plant Systematics and Evolution, 278(1-2):101-123.

Abstract

Despite extensive efforts, there are unresolved questions on evolutionary relationships in the angiosperm family Rubiaceae. Here, information from six loci and 149 Rubiaceae taxa provide new insights. Acranthera and Coptosapelta are strongly supported as sisters. Pollen grains of Acranthera possess several features common in Rubiaceae, but amongst potential similarities with the unusual grains of Coptosapelta are the nature of the apertures and the structure of the sexine. Luculia, Acranthera and Coptosapelta are excluded from the three subfamilies
Ixoroideae, Cinchonoideae and Rubioideae. Sipaneeae and
Condamineeae form a clade, sister to remaining Ixoroideae.
Rondeletieae and Guettardeae are sisters to remaining
Cinchonoideae. Colletoecema is sister to remaining Rubioideae, followed by the Urophylleae–Ophiorrhizeae clade. Nuclear ITS provided structured information at all phylogenetic levels, but the main gain from adding nrITS was the increased resolution. Average support values also increased but were generally high also without nrITS and the increase was not statistically significant.

Abstract

Despite extensive efforts, there are unresolved questions on evolutionary relationships in the angiosperm family Rubiaceae. Here, information from six loci and 149 Rubiaceae taxa provide new insights. Acranthera and Coptosapelta are strongly supported as sisters. Pollen grains of Acranthera possess several features common in Rubiaceae, but amongst potential similarities with the unusual grains of Coptosapelta are the nature of the apertures and the structure of the sexine. Luculia, Acranthera and Coptosapelta are excluded from the three subfamilies
Ixoroideae, Cinchonoideae and Rubioideae. Sipaneeae and
Condamineeae form a clade, sister to remaining Ixoroideae.
Rondeletieae and Guettardeae are sisters to remaining
Cinchonoideae. Colletoecema is sister to remaining Rubioideae, followed by the Urophylleae–Ophiorrhizeae clade. Nuclear ITS provided structured information at all phylogenetic levels, but the main gain from adding nrITS was the increased resolution. Average support values also increased but were generally high also without nrITS and the increase was not statistically significant.

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27 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Systematic Botany and Botanical Gardens
Dewey Decimal Classification:580 Plants (Botany)
Language:English
Date:March 2009
Deposited On:07 Apr 2009 18:53
Last Modified:05 Apr 2016 13:12
Publisher:Springer
ISSN:0378-2697
Publisher DOI:https://doi.org/10.1007/s00606-008-0138-4

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