Holospora-like bacteria “Candidatus Gortzia yakutica” and Preeria caryophila: Ultrastructure, promiscuity, and biogeography of the symbionts

Two already known representatives of Holospora-like bacteria, “Candidatus Gortzia yakutica” from Paramecium putrinum and Preeria caryophila, originally retrieved from the Paramecium aurelia complex, were found in new hosts: Paramecium nephridiatum and Paramecium polycaryum, respectively. In the pres...

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Bibliographic Details
Published in:European journal of protistology 2023-08, Vol.90, p.125998-125998, Article 125998
Main Authors: Fokin, Sergei I., Lebedeva, Natalia A., Potekhin, Alexey, Gammuto, Leandro, Petroni, Giulio, Serra, Valentina
Format: Article
Language:English
Subjects:
Ciliates
Host specificity
Molecular markers
Phylogeny
Symbiosis
Ultrastructure
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Summary:Two already known representatives of Holospora-like bacteria, “Candidatus Gortzia yakutica” from Paramecium putrinum and Preeria caryophila, originally retrieved from the Paramecium aurelia complex, were found in new hosts: Paramecium nephridiatum and Paramecium polycaryum, respectively. In the present study, these bacteria were investigated using morphological and molecular methods. For “Ca. G. yakutica”, the first details of the electron microscopic structure in the main and new hosts were provided. Regarding Pr. caryophila, the ultrastructural description of this species was implemented by several features previously unknown, such as the so called “membrane cluster” dividing periplasm from cytoplasm and fine composition of infectious forms before and during its releasing from the infected macronucleus. The new combinations of these Holospora-like bacteria with ciliate hosts were discussed from biogeographical and ecological points of view. Host specificity of symbionts as a general paradigm was critically reviewed as well.
ISSN:0932-4739
1618-0429
DOI:10.1016/j.ejop.2023.125998