Cyanophora paradoxa
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| Korshikov , 1924 |
Cyanophora paradoxa is a unicellular freshwater alga that belongs to the Glaucophyta division.
The cell contains two cyanelles , which correspond to the chloroplasts of other algae, but in contrast to these have a peptidoglycan layer between the two surrounding membranes. This is a remnant of the cell wall of the cyanobacteria from which they evolved through endosymbiosis (see endosymbiotic theory ). They represent an intermediate stage between free-living cyanobacteria and real chloroplasts, which have completely lost the cell wall. Another primitive feature is that the genes for the enzyme RuBisCO are all in the small chromosome of the cyanelle, while in the case of chloroplasts (like most of the original cyanobacterial genes) some of them have been relocated to the nucleus .
literature
- Robert Edward Lee: Phycology . 5th edition, Cambridge University Press, Cambridge 2018, pp. 80 f.