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Diversity, Genomics, and Distribution of Phytoplankton- Cyanobacterium Single-Cell Symbiotic Associations
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Number of Authors: 22019 (English)In: Annual Review of Microbiology, ISSN 0066-4227, E-ISSN 1545-3251, Vol. 73, p. 435-456Article, review/survey (Refereed) Published
Abstract [en]

Cyanobacteria are common in symbiotic relationships with diverse multicellular organisms (animals, plants, fungi) in terrestrial environments and with single-celled heterotrophic, mixotrophic, and autotrophic protists in aquatic environments. In the sunlit zones of aquatic environments, diverse cyanobacterial symbioses exist with autotrophic taxa in phytoplankton, including dinoflagellates, diatoms, and haptophytes (prymnesiophytes). Phototrophic unicellular cyanobacteria related to Synechococcus and Prochlorococcus are associated with a number of groups. N-2-fixing cyanobacteria are symbiotic with diatoms and haptophytes. Extensive genome reduction is involved in the N-2-fixing endosymbionts, most dramatically in the unicellular cyanobacteria associated with haptophytes, which have lost most of the photosynthetic apparatus, the ability to fix C, and the tricarboxylic acid cycle. The mechanisms involved in N-2-fixing symbioses may involve more interactions beyond simple exchange of fixed C for N. N-2-fixing cyanobacterial symbioses are widespread in the oceans, even more widely distributed than the best-known free-living N-2-fixing cyanobacteria, suggesting they may be equally or more important in the global ocean biogeochemical cycle of N.

Place, publisher, year, edition, pages
2019. Vol. 73, p. 435-456
Keywords [en]
symbiosis, cyanobacteria, nitrogen fixation, unicellular symbiosis, phytoplankton, photosymbiosis
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-174992DOI: 10.1146/annurev-micro-090817-062650ISI: 000485114700021PubMedID: 31500535OAI: oai:DiVA.org:su-174992DiVA, id: diva2:1361518
Available from: 2019-10-16 Created: 2019-10-16 Last updated: 2019-10-16Bibliographically approved

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