Phosphorus scavenging in the unicellular marine diazotroph Crocosphaera watsonii


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dc.contributor.author Dyhrman, Sonya T.
dc.contributor.author Haley, Sheean T.
dc.date.accessioned 2006-02-13T17:01:44Z
dc.date.available 2006-02-13T17:01:44Z
dc.date.issued 2006-02
dc.identifier.citation Applied and Environmental Microbiology 72 (2006): 1452-1458 en
dc.identifier.uri http://hdl.handle.net/1912/557
dc.description Author Posting. © American Society for Microbiology, 2006. This article is posted here by permission of American Society for Microbiology for personal use, not for redistribution. The definitive version was published in Applied and Environmental Microbiology 72 (2006): 1452-1458, doi:10.1128/AEM.72.2.1452-1458.2006.
dc.description.abstract Through the fixation of atmospheric nitrogen and photosynthesis, marine diazotrophs play a critical role in the global cycling of nitrogen and carbon. Crocosphaera watsonii is a recently described unicellular diazotroph that may significantly contribute to marine nitrogen fixation in tropical environments. One of the many factors that can constrain the growth and nitrogen fixation rates of marine diazotrophs is phosphorus bioavailability. Using genomic and physiological approaches, we examined phosphorus scavenging mechanisms in strains of C. watsonii from both the Atlantic and the Pacific. Observations from the C. watsonii WH8501 genome suggest that this organism has the capacity for high-affinity phosphate transport (e.g., homologs of pstSCAB) in low-phosphate, oligotrophic systems. The pstS gene (high-affinity phosphate binding) is present in strains isolated from both the Atlantic and the Pacific, and its expression was regulated by the exogenous phosphate supply in strain WH8501. Genomic observation also indicated a broad capacity for phosphomonoester hydrolysis (e.g., a putative alkaline phosphatase). In contrast, no clear homologs of genes for phosphonate transport and hydrolysis could be identified. Consistent with these genomic observations, C. watsonii WH8501 is able to grow on phosphomonoesters as a sole source of added phosphorus but not on the phosphonates tested to date. Taken together these data suggest that C. watsonii has a robust capacity for scavenging phosphorus in oligotrophic systems, although this capacity differs from that of other marine cyanobacterial genera, such as Synechococcus, Prochlorococcus, and Trichodesmium. en
dc.description.sponsorship Funding for this research was provided by the NSF OCE Biological Oceanography Program and the Woods Hole Oceanographic Institution Ocean Life Institute. en
dc.format.extent 150167 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher American Society for Microbiology en
dc.relation.uri http://dx.doi.org/10.1128/AEM.72.2.1452-1458.2006
dc.title Phosphorus scavenging in the unicellular marine diazotroph Crocosphaera watsonii en
dc.type Article en
dc.identifier.doi 10.1128/AEM.72.2.1452-1458.2006

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