期刊
MOLECULAR PHYLOGENETICS AND EVOLUTION
卷 56, 期 2, 页码 659-674出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2010.04.020
关键词
Phaeophyceae; Brown algal crown radiation; Multi-marker phylogeny; Time-calibrated phylogeny; Bayesian relaxed molecular clock; Hard/soft polytomy; Non-molecular characters evolution
资金
- Consortium National de Recherche en Genomique [2005/67]
- Genoscope and the Museum National d'Histoire Naturelle
- French 'Ministere de l'enseignement superieur et de la recherche'
The most conspicuous feature in previous phaeophycean phylogenies is a large polytomy known as the brown algal crown radiation (BACR). The BACR encompasses 10 out of the 17 currently recognized brown algal orders. A recent study has been able to resolve a few nodes of the BACR, suggesting that it may be a soft polytomy caused by a lack of signal in molecular markers. The present work aims to refine relationships within the BACR and investigate the nature and timeframe of the diversification in question using a dual approach. A multi-marker phylogeny of the brown algae was built from 10 mitochondria!, plastid and nuclear loci (>10,000 nt) of 72 phaeophycean taxa, resulting in trees with well-resolved inter-ordinal relationships within the BACR. Using Bayesian relaxed molecular clock analysis, it is shown that the BACR is likely to represent a gradual diversification spanning most of the Lower Cretaceous rather than a sudden radiation. Non-molecular characters classically used in ordinal delimitation were mapped on the molecular topology to study their evolutionary history. (C) 2010 Elsevier Inc. All rights reserved.
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