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Probable Evolutionary History of Cryptomonad Algae

  • Chapter
Origins of Plastids

Abstract

It has been proposed that cryptomonad algae arose by two distinct endosymbiotic events, the first involving a photosynthetic prokaryote and a phagotrophic eukaryotic host and the second involving the resulting primitive eukaryotic alga and a different phagotrophic eukaryotic host. Cryptomonad algae are unique in retaining the nucleus of the first endosymbiont (the nucleomorph) in the space between the inner and outer plastid membrane pairs. Comparisons of small subunit rRNA sequences from the nucleomorph and nucleus show that two distinct endosymbiotic events involving phylogenetically distinct eukaryotes contributed to the formation of the cryptomonad cell. Phylogenetic reconstructions using the sequences of plastid ribosomal RNA and ribulose-1,5-bisphosphate carboxylase/ oxygenase genes are presented and the evolutionary history of the cryptomonad plastid discussed. The evolution of other photosynthetic groups, deduced from the above sequence information, is also discussed.

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  1. Institute for Marine Biosciences, National Research Council, 1411 Oxford Street, Halifax, Nova Scotia, B3H 3Z1, Canada

    Susan E. Douglas

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  1. Marine Biology Research Division, 0202 Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, 92093-0202, USA

    Ralph A. Lewin

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Douglas, S.E. (1992). Probable Evolutionary History of Cryptomonad Algae. In: Lewin, R.A. (eds) Origins of Plastids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2818-0_14

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  • DOI: https://doi.org/10.1007/978-1-4615-2818-0_14

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