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The Convoluted Evolution of Eukaryotes With Complex Plastids
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Systematic Biology. Uppsala University, Science for Life Laboratory, SciLifeLab.
2017 (English)In: Secondary Endosymbioses / [ed] Yoshihisa Hirakawa, Elsevier, 2017, p. 1-30Chapter in book (Other academic)
Abstract [en]

The textbook version of how plastids were established by endosymbiosis and subsequently diversified is like a well-oiled machine: a cyanobacterial endosymbiont was taken up by a heterotrophic cell and transformed over time into a bona fide photosynthetic organelle (plastid), ultimately giving rise to all plants and algae. The reality, however, is much more complicated and this chapter attempts to describe recent advances in the field of plastid evolution brought to light by disciplines such as phylogenomics, comparative genomics, and cell biology. If (almost) all plastids may ultimately trace back to the same original endosymbiotic event, the very large diversity of plastids we observe today can only be explained by multiple layers of endosymbioses. That is, plastids were passed between distantly related eukaryotic lineages multiple times, essentially creating a phylogenetic imbroglio where plastids appear monophyletic but hosts are not. The burning question then is: how can we best fit plastid and host data into a comprehensive evolutionary framework? Focusing not only on the so-called complex plastids (the product of eukaryote-to-eukaryote endosymbioses) and the lineages that host them but also on the many related plastid-lacking lineages and orphan taxa, I discuss the emergence of new models of plastid evolution. These models generalize the notion of serial endosymbioses to explain the scattered distribution of plastids in the eukaryotic tree of life. As such, they make new testable predictions as to how complex algae are connected through endosymbiotic gene transfer, but testing this will require first to determine the real magnitude of this process.

Place, publisher, year, edition, pages
Elsevier, 2017. p. 1-30
Series
Advances in Botanical Research, ISSN 0065-2296 ; 84
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-334571DOI: 10.1016/bs.abr.2017.06.001ISI: 000414512900002ISBN: 978-0-12-802651-9 (print)OAI: oai:DiVA.org:uu-334571DiVA, id: diva2:1159897
Available from: 2017-11-24 Created: 2017-11-24 Last updated: 2018-03-20Bibliographically approved

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Burki, Fabien

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