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Unusual marine unic...
Unusual marine unicellular symbiosis with the nitrogen-fixing cyanobacterium UCYN-A
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- Zehr, Jonathan P. (author)
- University of California, USA
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- Shilova, Irina N. (author)
- University of California, USA
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- Farnelid, Hanna, 1983- (author)
- Linnéuniversitetet,Institutionen för biologi och miljö (BOM),University of California, USA,Ctr Ecol & Evolut Microbial Model Syst EEMiS
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- Muñoz-Marín, Maria del Carmen (author)
- University of California, USA;University of Córdoba, Spain
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- Turk-Kubo, Kendra A. (author)
- University of California, USA
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(creator_code:org_t)
- 2016-12-20
- 2017
- English.
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In: Nature Microbiology. - : Nature Publishing Group. - 2058-5276. ; 2:1, s. 1-10
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Abstract
Subject headings
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- Nitrogen fixation — the reduction of dinitrogen (N2) gas to biologically available nitrogen (N) — is an important source of N for terrestrial and aquatic ecosystems. In terrestrial environments, N2-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 N2-fixing organelles.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Keyword
- Applied microbiology
- Ecology
- Microbial biooceanography
- Microbial ecology
- Symbiosis
- Mikrobiologi
- Microbiology
Publication and Content Type
- ref (subject category)
- art (subject category)
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