Summary
The completion of genome sequencing of the cyanoplasts (here still called cyanelles) of Cyanophora paradoxa and of other primitive plastids provides strong evidence in favor of a common origin for all plastid types from a semiautonomous ancestral photosynthetic organelle, the „protoplastid”. The cyanoplasts representing an early off-branch are the only plastids that have retained the peptidoglycan wall inherited from the protoplastid (and, previously, from the endocytobiotic cyanobacterium, that participated in the singular primary endo-symbiotic event). Cyanoplasts, as well as other plastids devoid of chlorophyll b, contain between 50 and 100 genes that are absent from the genomes of the more derived chloroplasts of higher plants.
Dedicated to Prof. Dr. Benno Parthier on occasion of his 65th birthday.
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Löffelhardt, W. et al. (1997). The Complete Sequence of the Cyanelle Genome of Cyanophora paradoxa: The Genetic Complexity of a Primitive Plastid. In: Schenk, H.E.A., Herrmann, R.G., Jeon, K.W., Müller, N.E., Schwemmler, W. (eds) Eukaryotism and Symbiosis. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60885-8_3
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DOI: https://doi.org/10.1007/978-3-642-60885-8_3
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