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Unusual marine unicellular symbiosis with the nitrogen-fixing cyanobacterium UCYN-A
Univ Calif Santa Cruz, USA.
Univ Calif Santa Cruz, USA.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Univ Calif Santa Cruz, USA. (Ctr Ecol & Evolut Microbial Model Syst)ORCID iD: 0000-0003-3083-7437
Univ Calif Santa Cruz, USA ; Univ Cordoba, Spain.
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2017 (English)In: Nature Microbiology, E-ISSN 2058-5276, Vol. 2, no 1, 16214Article, review/survey (Refereed) Published
Abstract [en]

Nitrogen fixation - the reduction of dinitrogen (N-2) gas to biologically available nitrogen (N) - is an important source of N for terrestrial and aquatic ecosystems. In terrestrial environments, N-2-fixing symbioses involve multicellular plants, but in the marine environment these symbioses occur with unicellular planktonic algae. An unusual symbiosis between an uncultivated unicellular cyanobacterium (UCYN-A) and a haptophyte picoplankton alga was recently discovered in oligotrophic oceans. UCYN-A has a highly reduced genome, and exchanges fixed N for fixed carbon with its host. This symbiosis bears some resemblance to symbioses found in freshwater ecosystems. UCYN-A shares many core genes with the 'spheroid bodies' of Epithemia turgida and the endosymbionts of the amoeba Paulinella chromatophora. UCYN-A is widely distributed, and has diversified into a number of sublineages that could be ecotypes. Many questions remain regarding the physical and genetic mechanisms of the association, but UCYN-A is an intriguing model for contemplating the evolution of N-2-fixing organelles.

Place, publisher, year, edition, pages
Nature Publishing Group, 2017. Vol. 2, no 1, 16214
National Category
Microbiology
Research subject
Ecology, Microbiology
Identifiers
URN: urn:nbn:se:lnu:diva-62066DOI: 10.1038/nmicrobiol.2016.214ISI: 000396366300020PubMedID: 27996008OAI: oai:DiVA.org:lnu-62066DiVA: diva2:1086624
Available from: 2017-04-03 Created: 2017-04-03 Last updated: 2017-05-22Bibliographically approved

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CiteExportLink to record
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Citation style
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