New intracellular bacteria were detected in the cytoplasm of Paramecium calkinsi and P. putrinum. Some of the bacteria were not evenly distributed in the cytoplasm of the host but were found in the center of the cell, eventually near the nuclei, but not in the cortex area, whereas another species was found in the cortex area. These peculiarities of intracellular bacteria localization in the host suggest that the conditions in various parts of the cytoplasm favor bacterial maintenance to different extent. Due to the results obtained by transmission electron microscopy and in situ hybridization using appropriate oligonucleotide probes, the bacteria, three or possibly four species, are Gram-negative and belong to the alpha-subgroup of proteobacteria. Bacteria from one stock of Fl calkinsi were found to be infectious for bacteria-free cells of P. calkinsi and P. nephridiatum.
Paramecium calkinsi and P. putrinum (Ciliophora, Protista) harboring alpha-subgroup bacteria in the cytoplasm
FOKIN, SERGEY;
2000-01-01
Abstract
New intracellular bacteria were detected in the cytoplasm of Paramecium calkinsi and P. putrinum. Some of the bacteria were not evenly distributed in the cytoplasm of the host but were found in the center of the cell, eventually near the nuclei, but not in the cortex area, whereas another species was found in the cortex area. These peculiarities of intracellular bacteria localization in the host suggest that the conditions in various parts of the cytoplasm favor bacterial maintenance to different extent. Due to the results obtained by transmission electron microscopy and in situ hybridization using appropriate oligonucleotide probes, the bacteria, three or possibly four species, are Gram-negative and belong to the alpha-subgroup of proteobacteria. Bacteria from one stock of Fl calkinsi were found to be infectious for bacteria-free cells of P. calkinsi and P. nephridiatum.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
