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Richelia
Stockholm University, Sweden.
University of Texas, USA.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0002-8779-6464
Woods Hole Oceanographic Institution, USA.
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2022 (English)In: Bergey's Manual of Systematics of Archaea and Bacteria, John Wiley & Sons, 2022, p. 1-17Chapter in book (Refereed)
Abstract [en]

Ri.che'li.a. N.L. fem. n. Richelia, named for the Danish admiral Andreas du Plessis de Richelieu (1852–1932).

Cyanobacteria / Cyanobacteria / Cyanobacteriales / Nostocaceae / Richelia

Filamentous heterocyst-forming, Gram-stain-negative, aerobic, phototrophic, N2-fixing, and occurring either as free-living or most often associated with several marine diatom genera (Rhizosolenia, Hemiaulus, and Chaetoceros). Filaments (trichomes) contain variable numbers of sheathless vegetative cells and one terminal heterocyst. Filaments lack akinetes and have limited motility via gliding. Gas vesicles are absent. Cyanophycin granules can be present in vegetative cells and heterocysts. Glycogen appears as large deposits, and thylakoids are dispersed randomly. Reproduce by normal cell division and asynchronous with one host diatom Rhizosolenia. DNA G + C content (mol%) from draft genomes varies 33–39%; genome size varies 3.42–6.04 Mb. Reduces atmospheric N2 with nitrogenase. Known habitats are warm (24–27.5°C), marine, and oligotrophic seas with intermediate (32 PSU) to fully marine (36 PSU) salinities. Biogeochemically relevant as N2 fixers and drivers of carbon export. Have been reported in all major ocean basins (Atlantic, Pacific, and Indian) and smaller seas (Mediterranean Sea and Red Sea).

DNA G + C content (mol%): 33–39 (genome sequence).

Type species: Richelia intracellularis Schmidt in Ostenfeld and Schmidt 1901.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022. p. 1-17
National Category
Microbiology
Research subject
Ecology, Microbiology
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URN: urn:nbn:se:lnu:diva-126796DOI: 10.1002/9781118960608.gbm01520ISBN: 9781118960608 (electronic)OAI: oai:DiVA.org:lnu-126796DiVA, id: diva2:1828335
Available from: 2024-01-16 Created: 2024-01-16 Last updated: 2024-02-06Bibliographically approved

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Lundin, Daniel

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