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• W1523285007 abstract "Iron limits carbon fixation in much of the modern ocean due to the very low solubility of ferric iron in oxygenated ocean waters. We examined iron limitation of growth rate under varying light intensities in the coastal cyanobacterium Synechococcus bacillaris, a descendent of the oxygenic phototrophs that evolved ca. 3 billion years ago when the ocean was reducing and iron was present at much higher concentrations as soluble Fe(II). Decreasing light intensity increased the cellular iron:carbon (Fe:C) ratio needed to support a given growth rate, indicating that iron and light may co-limit the growth of Synechococcus in the ocean, as shown previously for eukaryotic phytoplankton. The cellular Fe:C ratios needed to support a given growth rate were 5- to 8-fold higher than ratios for coastal eukaryotic algae growing under the same light conditions. The higher iron requirements for growth in the coastal cyanobacterium may be largely caused by the high demand for iron in photosynthesis, and to higher ratios of iron-rich photosystem I to iron-poor photosystem II in Synechococcus than in eukaryotic algae. This high iron requirement may also be vestigial and represent an adaptation to the much higher iron levels in the ancient reducing ocean. Due to the high cellular iron requirement for photosynthesis and growth, and for low light acclimation, Synechococcus may be excluded from many low-iron and low-light environments. Indeed, it decreases rapidly with depth within the ocean’s deep chlorophyll maximum (DCM) where iron and light levels are low, and lower-iron requiring picoeukaryotes typically dominate the biomass of phytoplankton community within the mid to lower DCM." @default.
• W1523285007 created "2016-06-24" @default.
• W1523285007 creator A5033128857 @default.
• W1523285007 creator A5063924684 @default.
• W1523285007 date "2015-06-18" @default.
• W1523285007 modified "2023-10-10" @default.
• W1523285007 title "High iron requirement for growth, photosynthesis, and low-light acclimation in the coastal cyanobacterium Synechococcus bacillaris" @default.
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• W1523285007 doi "https://doi.org/10.3389/fmicb.2015.00561" @default.
• W1523285007 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4471429" @default.
• W1523285007 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26150804" @default.
• W1523285007 hasPublicationYear "2015" @default.
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