Discovery of symbiotic nitrogen-fixing cyanobacteria in corals

Michael P. Lesser, Charles H. Mazel, Maxim Y. Gorbunov, Paul G. Falkowski

Research output: Contribution to journalArticlepeer-review

309 Scopus citations


Colonies of the Caribbean coral Montastraea cavernosa exhibit a solar-stimulated orange-red fluorescence that is spectrally similar to a variety of fluorescent proteins expressed by corals. The source of this fluorescence is phycoerythrin in unicellular, nonheterocystis, symbiotic cyanobacteria within the host cells of the coral. The cyanobacteria coexist with the symbiotic dinoflagellates (zooxanthellae) of the coral and express the nitrogen-fixing enzyme nitrogenase. The presence of this prokaryotic symbiont in a nitrogen-limited zooxanthellate coral suggests that nitrogen fixation may be an important source of this limiting element for the symbiotic association.

Original languageEnglish (US)
Pages (from-to)997-1000
Number of pages4
Issue number5686
StatePublished - Aug 13 2004

All Science Journal Classification (ASJC) codes

  • General

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