Change search
ReferencesLink to record
Permanent link

Direct link
Cytologic and Genetic Characteristics of Endobiotic Bacteria and Kleptoplasts of Virgulinella fragilis (Foraminifera)
Stockholm University, Faculty of Science, Department of Geological Sciences.
Show others and affiliations
Number of Authors: 7
2015 (English)In: Journal of Eukaryotic Microbiology, ISSN 1066-5234, E-ISSN 1550-7408, Vol. 62, no 4, 454-469 p.Article in journal (Refereed) Published
Abstract [en]

The benthic foraminifer Virgulinella fragilis Grindell and Collen 1976 has multiple putative symbioses with both bacterial and kleptoplast endobionts, possibly aiding its survival in environments from dysoxia (5-45mol-O-2/L) to microxia (0-5mol-O-2/L) and in the dark. To clarify the origin and function of V. fragilis endobionts, we used genetic analyses and transmission electron microscope observations. Virgulinella fragilis retained -proteobacteria concentrated at its cell periphery just beneath the cell membranes. Unlike another foraminifer Stainforthia spp., which retains many bacterial species, V. fragilis has a less variable bacterial community. This suggests that V. fragilis maintains a specific intracellular bacterial flora. Unlike the endobiotic bacteria, V. fragilis klepto-plasts originated from various diatom species and are found in the interior cytoplasm. We found evidence of both retention and digestion of kleptoplasts, and of fragmentation of the kleptoplastid outer membrane that likely facilitates transport of kleptoplastid products to the host. Accumulations of mitochondria were observed encircling endobiotic bacteria. It is likely that the bacteria use host organic material for carbon oxidation. The mitochondria may use oxygen available around the -proteobacteria and synthesize adenosine triphosphate, perhaps for sulfide oxidation.

Place, publisher, year, edition, pages
2015. Vol. 62, no 4, 454-469 p.
Keyword [en]
Molecular phylogeny, multiple endosymbiosis, transmission electron microscopy
National Category
Biological Sciences Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-119306DOI: 10.1111/jeu.12200ISI: 000357329400003OAI: diva2:844182
Available from: 2015-08-04 Created: 2015-08-03 Last updated: 2015-08-04Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Brüchert, Volker
By organisation
Department of Geological Sciences
In the same journal
Journal of Eukaryotic Microbiology
Biological SciencesEarth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 14 hits
ReferencesLink to record
Permanent link

Direct link