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MBE Advance Access published online on September 6, 2007
Molecular Biology and Evolution, doi:10.1093/molbev/msm186
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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

Letter

Phylogeny of Nuclear Encoded Plastid Targeted Proteins Supports an Early Divergence of Glaucophytes within Plantae

Adrian Reyes-Prieto and Debashish Bhattacharya*

Department of Biological Sciences and Roy J. Carver Center for Comparative Genomics, University of Iowa, Iowa City, IA 52242, USA

* Corresponding author: University of Iowa, Department of Biological Sciences and the Roy J. Carver Center for Comparative Genomics, 446 Biology Building, Iowa City, Iowa 52242-1324, USA, Telephone: (319) 335-1977, Fax: (319) 335-1069, Email: debashi-bhattacharya{at}uiowa.edu

Received for publication July 4, 2007. Revision received August 24, 2007. Accepted for publication August 31, 2007.

The phylogenetic position of the glaucophyte algae within the eukaryotic supergroup Plantae remains to be unambiguously established. Here we assembled a multi-gene data set of conserved nuclear encoded plastid targeted proteins of cyanobacterial origin (i.e., through primary endosymbiotic gene transfer) from glaucophyte, red, and green (including land plants) algae to infer the branching order within this supergroup. We find strong support for the early divergence of glaucophytes within the Plantae corroborating two important putatively ancestral characters shared by glaucophyte plastids and the cyanobacterial endosymbiont that gave rise to this organelle: the presence of a peptidoglycan deposition between the two organelle membranes and carboxysomes. Both of these traits were apparently lost in the common ancestor of red and green algae after the divergence of glaucophytes.

Key Words: Cyanophora paradoxa • glaucophytes • endosymbiosis • Plantae • plastid targeted proteins


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