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MBE Advance Access originally published online on May 7, 2007
Molecular Biology and Evolution 2007 24(8):1592-1595; doi:10.1093/molbev/msm091
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© The Author 2007. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Letters

Phylogeny of Primary Photosynthetic Eukaryotes as Deduced from Slowly Evolving Nuclear Genes

Hisayoshi Nozaki*, Mineo Iseki{dagger}, Masami Hasegawa{ddagger},1, Kazuharu Misawa*, Takashi Nakada*, Narie Sasaki§,2 and Masakatsu Watanabe||

* Department of Biological Sciences, Graduate School of Science, University of Tokyo, Tokyo, Japan
{dagger} Hayama Center for Advanced Studies, Graduate University for Advanced Studies, Kanagawa, Japan
{ddagger} The Institute of Statistical Mathematics, Tokyo, Japan
§ Division of Life Science, Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo, Japan
|| Department of Evolutionary Studies of Biosystems, School of Advanced Sciences, Graduate University for Advanced Studies, Kanagawa, Japan

E-mail: nozaki@biol.s.u-tokyo.ac.jp.

Key Words: eukaryote evolution • long branch attraction • phylogeny • plastid endosymbiosis • primary photosynthetic eukaryotes • taxon sampling

The first 150 words of the full text of this article appear below.


   Introduction
 
The biodiversity of photosynthetic eukaryotes, traditionally recognized as nine algal divisions or phyla, is attributed to two kinds of endosymbiotic events involving plastids: primary endosymbiosis and secondary endosymbiosis. Therefore, the phylogenetic positions of primary photosynthetic eukaryotes are fundamental for understanding the evolution of eukaryotic cells and establishing higher taxonomic concepts of eukaryotes. Recently, Rodríguez-Ezpeleta et al. (2005)Go demonstrated the strong monophyly of the three groups of primary photosynthetic eukaryotes (green plants, glaucophytes, and red algae) based on 143 nuclear genes. However, they analyzed only two divisions of the secondary phototrophs belonging to the Stramenopiles–Alveolata (SA) lineage, and their 143 genes included rapidly evolving genes. Here, we reexamine the phylogeny of the primary phototrophs based on slowly evolving nuclear genes selected mainly from the data matrix of Rodríguez-Ezpeleta et al. (2005)Go, using additional operational taxonomic units (OTUs) of a free-living, secondary phototrophic group (Haptophyta) and of Excavata (Heterolobosea and Reclinomonas. . . [Full Text of this Article]


   Results and Discussion
 

   Methods
 

   Supplementary Material
 

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