An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids
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fmicb-10-01612.pdf
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Author(s)
Moore, Kelsey R.
Magnabosco, Cara
Momper, Lily
Gold, David A.
Bosak, Tanja
Fournier, Gregory P.
Date Issued
July 2019
Journal
Frontiers in Microbiology
Publisher
Frontiers Media SA
Citation
Moore, Kelsey R. et al. "An Expanded Ribosomal Phylogeny of Cyanobacteria Supports a Deep Placement of Plastids." Frontiers in Microbiology 10 (July 2019): 1612
Version
Final published version
Abstract
The phylum Cyanobacteria includes free-living bacteria and plastids, the descendants of cyanobacteria that were engulfed by the ancestral lineage of the major photosynthetic eukaryotic group Archaeplastida. Endosymbiotic events that followed this primary endosymbiosis spread plastids across diverse eukaryotic groups. The remnants of the ancestral cyanobacterial genome present in all modern plastids, enable the placement of plastids within Cyanobacteria using sequence-based phylogenetic analyses. To date, such phylogenetic studies have produced conflicting results and two competing hypotheses: (1) plastids diverge relatively recently in cyanobacterial evolution and are most closely related to nitrogen-fixing cyanobacteria, or (2) plastids diverge early in the evolutionary history of cyanobacteria, before the divergence of most cyanobacterial lineages. Here, we use phylogenetic analysis of ribosomal proteins from an expanded data set of cyanobacterial and representative plastid genomes to infer a deep placement for the divergence of the plastid ancestor lineage. We recover plastids as sister to Gloeomargarita and show that the group diverges from other cyanobacterial groups before Pseudanabaena, a previously unreported placement. The tree topologies and phylogenetic distances in our study have implications for future molecular clock studies that aim to model accurate divergence times, especially with respect to groups containing fossil calibrations. The newly sequenced cyanobacterial groups included here will also enable the use of novel cyanobacterial microfossil calibrations.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.3389/fmicb.2019.01612
