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MBE Advance Access originally published online on September 6, 2007
Molecular Biology and Evolution 2007 24(11):2358-2361; 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

Letters

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

E-mail: debashi-bhattacharya{at}uiowa.edu.

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 multigene 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 2 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 2 organelle membranes and carboxysomes. Both 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

Martin Embley, Associate Editor


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