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Dating phylogenetically basal eudicots using rbcL sequences and multiple fossil reference points
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Department of Evolution, Genomics and Systematics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Department of Evolution, Genomics and Systematics, Systematic Botany. Systematisk botanik.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Department of Evolution, Genomics and Systematics, Systematic Botany.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Department of Evolution, Genomics and Systematics, Systematic Botany.
2005 (English)In: American Journal of Botany, Vol. 92, 1737-1748 p.Article in journal (Refereed) Published
Abstract [en]

A molecular dating of the phylogenetically basal eudicots (Ranunculales, Proteales, Sabiales, Buxales and Trochodendrales sensu

Angiosperm Phylogeny Group II) has been performed using several fossils as minimum age constraints. All rbcL sequences available

in GenBank were sampled for the taxa in focus. Dating was performed using penalized likelihood, and results were compared with

nonparametric rate smoothing. Fourteen eudicot fossils, all with a Cretaceous record, were included in this study for age constraints.

Nine of these are assigned to basal eudicots and the remaining five taxa represent core eudicots. Our study shows that the choice of

methods and fossil constraints has a great impact on the age estimates, and that removing one single fossil change the results in the

magnitude of tens of million years. The use of several fossil constraints increase the probability of approaching the true ages. Our

results suggest a rapid diversification during the late Early Cretaceous, with all the lineages of basal eudicots emerging during the

latest part of the Early Cretaceous. The age of Ranunculales was estimated to 120 my, Proteales to 119 my, Sabiales to 118 my,

Buxales to 117 my, and Trochodendrales to 116 my.

Place, publisher, year, edition, pages
2005. Vol. 92, 1737-1748 p.
Keyword [en]
Cretaceous, dating, eudicots, fossils
National Category
Biological Systematics
Identifiers
URN: urn:nbn:se:uu:diva-77113OAI: oai:DiVA.org:uu-77113DiVA: diva2:105025
Available from: 2007-02-05 Created: 2007-02-05 Last updated: 2011-01-11

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Anderson, Cajsa LisaBremer, KåreFriis, Else Marie

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