Paramecium caudatum acquires heat-shock resistance in ciliary movement by infection with the endonuclear symbiotic bacterium Holospora obtusa.
FEMS Microbiol Lett
; 243(1): 101-5, 2005 Feb 01.
Article
em En
| MEDLINE
| ID: mdl-15668007
ABSTRACT
Holospora obtusa is a macronucleus-specific bacterium of the ciliate Paramecium caudatum. Three types of P. caudatum cells (H. obtusa-free cells, cells bearing the reproductive form of H. obtusa and cells bearing the predominantly infectious form of H. obtusa) cultured at 25 degrees C were transferred to 4, 10, 25, 35 and 40 degrees C and their swimming velocities were measured by taking photomicrographs with two-second exposures. The H. obtusa-free cells almost ceased swimming at both 4 and 40 degrees C, while cells bearing the reproductive form and those bearing the predominantly infectious form actively swam even at these temperatures. These results show that the host cell can acquire heat-shock resistance when infected by H. obtusa in the macronucleus. This is the first evidence to show that the endonuclear symbiont Holospora contributes to maintain the ciliary movement of the host even at temperatures unsuitable for the host growth.
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Base de dados:
MEDLINE
Assunto principal:
Simbiose
/
Cílios
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Resposta ao Choque Térmico
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Holosporaceae
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Paramecium caudatum
Limite:
Animals
Idioma:
En
Revista:
FEMS Microbiol Lett
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Japão