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dc.contributor.authorSánchez-Baracaldo, Patricia
dc.contributor.authorRaven, John A.
dc.contributor.authorPisani, Davide
dc.contributor.authorKnoll, Andrew
dc.date.accessioned2019-08-01T19:28:52Z
dc.date.issued2017-08-14
dc.identifier.citationSánchez-Baracaldo, Patricia, John A. Raven, Davide Pisani, and Andrew H. Knoll. 2017. Early Photosynthetic Eukaryotes Inhabited Low-salinity Habitats. Proceedings of the National Academy of Sciences of the United States of America 114, no. 37: E7737-E7745.en_US
dc.identifier.issn0027-8424en_US
dc.identifier.issn1091-6490en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41048975*
dc.description.abstractThe early evolutionary history of the chloroplast lineage remains an open question. It is widely accepted that the endosymbiosis that established the chloroplast lineage in eukaryotes can be traced back to a single event, in which a cyanobacterium was incorporated into a protistan host. It is still unclear, however, which Cyanobacteria are most closely related to the chloroplast, when the plastid lineage first evolved, and in what habitats this endosymbiotic event occurred. We present phylogenomic and molecular clock analyses, including data from cyanobacterial and chloroplast genomes using a Bayesian approach, with the aim of estimating the age for the primary endosymbiotic event, the ages of crown groups for photosynthetic eukaryotes, and the independent incorporation of a cyanobacterial endosymbiont by Paulinella. Our analyses include both broad taxon sampling (119 taxa) and 18 fossil calibrations across all Cyanobacteria and photosynthetic eukaryotes. Phylogenomic analyses support the hypothesis that the chloroplast lineage diverged from its closet relative Gloeomargarita, a basal cyanobacterial lineage, ∼2.1 billion y ago (Bya). Our analyses suggest that the Archaeplastida, consisting of glaucophytes, red algae, green algae, and land plants, share a common ancestor that lived ∼1.9 Bya. Whereas crown group Rhodophyta evolved in the Mesoproterozoic Era (1,600–1,000 Mya), crown groups Chlorophyta and Streptophyta began to radiate early in the Neoproterozoic (1,000–542 Mya). Stochastic mapping analyses indicate that the first endosymbiotic event occurred in low-salinity environments. Both red and green algae colonized marine environments early in their histories, with prasinophyte green phytoplankton diversifying 850–650 Mya.en_US
dc.description.sponsorshipEarth and Planetary Sciencesen_US
dc.language.isoen_USen_US
dc.publisherProceedings of the National Academy of Sciencesen_US
dash.licenseLAA
dc.titleEarly Photosynthetic Eukaryotes Inhabited Low-Salinity Habitatsen_US
dc.typeJournal Articleen_US
dc.description.versionProofen_US
dc.relation.journalProceedings of the National Academy of Sciences of the United States of America (PNAS)en_US
dash.depositing.authorKnoll, Andrew
dc.date.available2019-08-01T19:28:52Z
dash.workflow.commentsFAR2017en_US
dc.identifier.doi10.1073/pnas.1620089114
dc.source.journalProc Natl Acad Sci USA
dash.source.volume114;37
dash.source.pageE7737-E7745
dash.contributor.affiliatedKnoll, Andrew


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