The endosymbiotic unit ofStentor polymorphus andChlorella sp. morphological and physiological studies |
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Authors: | W Reisser |
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Institution: | (1) Institute of Plant Physiology, Department of Experimental Phycology, University of Göttingen, Untere Karspüle 2, D-3400 Göttingen, Federal Republic of Germany |
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Abstract: | Summary The greenStentor polymorphus harbours unicellular coccoid chlorophycean algae. They are located in food vacuoles, where they show various states of digestion, as well as in individual so-called perialgal vacuoles. According to their characteristic morphological properties the algae belong to the genusChlorella. They can be isolated from the ciliate and cultivated in mass cultures in a sterile defined inorganic medium supplemented with vitamins B1 and B12. The algae have no secondary carotenoids and excrete maltose by a pH-dependent mechanism. They thus show a conspicuous physiological similarity to the symbiotic chlorellae ofParamecium bursaria andHydra viridis, which also excrete maltose.A comparison of the properties of the chlorellae isolated fromStentor polymorphus and of the intactStentor polymorphus-Chlorella unit with the characteristic features of symbiotic chlorellae and with endosymbiotic systems containingChlorella sp. in general, lead to the conclusion that the greenStentor polymorphus is also a true endosymbiotic system. |
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Keywords: | Chlorella sp Stentor polymorphus Symbiosis |
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