The plastid ancestor originated among one of the major cyanobacterial lineages

Jesús A. G. Ochoa de Alda (), Rocío Esteban, María Luz Diago and Jean Houmard
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Jesús A. G. Ochoa de Alda: Grupo Hortofruenol, INTAEX-CICYTEX
Rocío Esteban: School of Biology, IE University
María Luz Diago: School of Biology, IE University

Nature Communications, 2014, vol. 5, issue 1, 1-10

Abstract: Abstract The primary endosymbiotic origin of chloroplasts is now well established but the identification of the present cyanobacteria most closely related to the plastid ancestor remains debated. We analyse the evolutionary trajectory of a subset of highly conserved cyanobacterial proteins (core) along the plastid lineage, those which were not lost after the endosymbiosis. We concatenate the sequences of 33 cyanobacterial core proteins that share a congruent evolutionary history, with their eukaryotic counterparts to reconstruct their phylogeny using sophisticated evolutionary models. We perform an independent reconstruction using concatenated 16S and 23S rRNA sequences. These complementary approaches converge to a plastid origin occurring during the divergence of one of the major cyanobacterial lineages that include N2-fixing filamentous cyanobacteria and species able to differentiate heterocysts.

Date: 2014
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DOI: 10.1038/ncomms5937

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