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Journal of Cell Science, Vol 95, 303-308, Copyright © 1990 by Company of Biologists

Submitted on October 2, 1989
Accepted on October 30, 1989

Evidence that cryptomonad chloroplasts evolved from photosynthetic eukaryotic endosymbionts

GEOFFREY IAN MCFADDEN 1

1 Plant Cell Biology Research Centre, School of Botany, University of Melbourne, Parkville, Victoria 3052, Australia

Unicellular algae of the division Cryptophyta possess an unusual subcellular compartment of unknown derivation. This compartment, which is partitioned off from the main cytoplasm by two membranes, contains a chloroplast and a small nucleus-like organelle surrounded by ribosomelike particles. Electron-microscopic in situ hybridization has been used to show that the ribosomes in this subcellular compartment are eukaryotic. In addition, eukaryotic rRNA has been localised within the nucleus-like organelle, suggesting that the rRNAs may be transcribed from genes in this nucleus. This identification of a second, nucleuscontaining eukaryotic compartment within these cells supports the hypothesis that cryptomonads contain a reduced photosynthetic eukaryotic endosymbiont.

Key words: chloroplasts, cryptomonads, endosymbiosis, in situ hybridization, ribosomes, ribosomal RNA

Submitted on October 2, 1989
Accepted on October 30, 1989




This article has been cited by other articles:


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G. McFadden, P. Gilson, and S. Douglas
The photosynthetic endosymbiont in cryptomonad cells produces both chloroplast and cytoplasmic-type ribosomes
J. Cell Sci., January 2, 1994; 107(2): 649 - 657.
[Abstract] [PDF]


© The Company of Biologists Ltd 1990