Abstract
Monoxenic cultures of the anaerobic, endosymbiont-free ciliate Trimyema compressum were incubated with low numbers of Bacteroides sp. strain WoCb15 as food bacteria and two strains (DSM 3636 and 3637) of Methanobacterium formicicum, which originally had been isolated from the anaerobic protozoa Metopus striatus and Pelomyxapalustris. The ciliate which had lost its original endosymbiotic methanogens ingested both strains of M. formicicum. The methanogenic bacteria were found intact in large vacuoles in contrast to the food bacteria which were digested. Single methanogens were separated from the vacuoles and appeared surrounded by a membrane in the cytoplasm of the ciliate. After 2 months of incubation, the methanogenic bacteria still exhibited the typical bluish fluorescence and the new symbiotic association of M. formicicum and T. compressum excreted methane. Increasing the growth rate of the ciliates by large numbers of food bacteria resulted in a loss of the methanogenic bacteria, due to statistical outgrowth.
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Wagener, S., Bardele, C.F. & Pfennig, N. Functional integration of Methanobacterium formicicum into the anaerobic ciliate Trimyema compressum . Arch. Microbiol. 153, 496–501 (1990). https://doi.org/10.1007/BF00248433
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DOI: https://doi.org/10.1007/BF00248433