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New insights into the ecology of the globally significant uncultured nitrogen-fixing symbiont UCYN-A
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Univ Calif Santa Cruz, Ocean Sci Dept, Santa Cruz, CA 95064 USA. (Ctr Ecol & Evolut Microbial Model Syst EEMiS)ORCID iD: 0000-0003-3083-7437
Univ Calif Santa Cruz, USA.
Univ Calif Santa Cruz, USA ; Univ Cordoba, Spain.
Univ Calif Santa Cruz, USA.
2016 (English)In: Aquatic Microbial Ecology, ISSN 0948-3055, E-ISSN 1616-1564, Vol. 77, no 3, p. 125-138Article, review/survey (Refereed) Published
Abstract [en]

Cyanobacterial nitrogen-fixers (diazotrophs) play a key role in biogeochemical cycling of carbon and nitrogen in the ocean. In recent years, the unusual symbiotic diazotrophic cyanobacterium Atelocyanobacterium thalassa (UCYN-A) has been recognized as one of the major diazotrophs in the tropical and subtropical oceans. In this review, we summarize what is currently known about the geographic distribution of UCYN-A, as well as the environmental factors that govern its distribution. In addition, by compiling UCYN-A nifH sequences from the GenBank no. database as well as those from nifH gene amplicon next generation sequencing studies, we present an in-depth analysis of the distribution of defined UCYN-A sublineages (UCYN-A1, UCYN-A2 and UCYN-A3) and identify a novel sublineage, UCYN-A4, which may be significant in some environments. Each UCYN-A sublineage exhibited a remarkable global distribution pattern and several UCYN-A sublineages frequently co-occurred within the same sample, suggesting that if they represent different ecotypes they have overlapping niches. Recently, single cell visualization techniques using specific probes targeting UCYN-A1 and UCYN-A2 and their respective associated eukaryotic partner cells showed that the size of the consortia and the number of UCYN-A cells differed between these 2 sublineages. Combined, the results highlight that UCYN-A sublineages likely have different physiological requirements, which need to be accounted for in future studies. Furthermore, based on our increasing knowledge of the diversity of the UCYN-A lineage, we discuss some of the limitations of currently used cultivation-independent molecular techniques for the identification and quantification of UCYN-A.

Place, publisher, year, edition, pages
2016. Vol. 77, no 3, p. 125-138
Keywords [en]
UCYN-A, Symbiosis, nifH, qPCR, Next generation amplicon sequencing, CARD-FISH, Braarudosphaera bigelowii
National Category
Ecology Microbiology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-59023DOI: 10.3354/ame01794ISI: 000387120300001Scopus ID: 2-s2.0-84991829529OAI: oai:DiVA.org:lnu-59023DiVA, id: diva2:1056468
Projects
EcoChangeAvailable from: 2016-12-14 Created: 2016-12-14 Last updated: 2018-04-24Bibliographically approved

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Farnelid, Hanna

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