Gymnodinium aeruginosum (Dinophyta): A blue-green dinoflagellate with a vestigial,anucleate, cryptophycean endosymbiont |
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Authors: | E Schnepf S Winter D Mollenhauer |
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Institution: | (1) Lehrstuhl für Zellenlehre, Fakultät für Biologie, Universität Heidelberg, Im Neuenheimer Feld 230, D-6900 Heidelberg, Federal Republic of Germany;(2) Außenstelle Lochmühle, Forschungsinstitut Senckenberg, D-6465 Biebergemünd-Bieber, Federal Republic of Germany |
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Abstract: | Gymnodinium aeruginosum has the usual fine structure of a dinoflagellate but does not seem to contain a well elaborated peduncle or a microtubular basket. Naked cells are surrounded by a single large amphiesmal vesicle. It houses an endosymbiont with typical blue-green cryptophycean chloroplasts (generally only one), cryptophycean starch grains in the periplastidal cytoplasm without a nucleomorph, and two membranes separating the periplastidal cytoplasm from the cryptophycean cytoplasm which contains mitochondria, ER, vesicles and ribosomes, but no eukaryotic nucleus. The endosymbiont is surrounded by a single membrane. Possible ways of the acquisition of the endosymbiont and the problem of the existence of ribosomes within a compartment without nucleus are discussed.Devoted to Prof. Dr.L. Geitler, the Nestor of phycology and endosymbiosis research, on the occasion of the 90th anniversary of his birthday. |
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Keywords: | Algae Dinophyta Gymnodinium aeruginosum Anucleate cryptophycean endosymbiont evolution ribosomes in an anucleate compartment |
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