Cytological observations made on Prochloron cells from a variety of didemnid hosts present a consistent picture. Characteristic differences occur between cells from different sources (Figures 10, 12–14), but obvious similarities indicate that these organisms form a coherent and probably closely related group. Prochlorophytes are clearly prokaryotes. Nuclei and mitochondria are absent. Photosynthetic membranes are free in the cell and are not packaged into chloropiasts. Various inclusions, DNA filaments, protein crystalloids, pigment and storage granules are usually not membrane-limited. The only other true membrane systems present are the cell-limiting plasmalemma and membranes surrounding vacuole-like regions of low optical density.
KeywordsThylakoid Membrane Algal Cell Central Vacuole Stromal Area Large Central Vacuole
Unable to display preview. Download preview PDF.
References (Additional to Bibliography)
- Eldredge, L. G. A taxonomic review of Indo-Pacific didemnid ascidians and descriptions of 23 Central Pacific species. Micronesica 2: 161–261; 1965.Google Scholar
- Gantt, E. and S. F. Conti. Ultrastructure of blue-green algae. J. Bacterial. 97: 1486–1493; 1969.Google Scholar
- Kott, P. Didemnid-algal symbioses: algal transfer to a new host generation. Proc. Fourth International Coral Reef Symposium, Manila. 2: 721–723; 1981.Google Scholar
- Swift, Hewson. Nucleic acids of mitochondria and chloroplasts. Amer. Naturalist. 99: 210–227; 1965.Google Scholar
- Swift, H., and G. Leser. Cytochemical studies on prochlorophytes: localization of DNA and ribulose 1,5-bisphosphate carboxylase-oxygenase. Phycologia (in press); 1989.Google Scholar