Variability in the production of organic ligands, by Synechococcus PCC 7002, under different iron scenarios

摘要: Several Fe-uptake mechanisms suggest the importance of presence certain organic ligands in phytoplankton exudates. Here, it has been studied how Synechococcus (strain PCC 7002) acclimates to Fe-bioavailability, comparing growth and exudation under two different Fe regimes. These cyanobacteria were incubated UV-treated seawater supplemented only with major nutrients iron scenarios (Low-Fe High-Fe), without chelating agents, order analyze production. The levels dissolved carbon (DOC) natural (hydroxamic phenolic moieties) monitored. responses extracellular release rates (ER), normalized per cell, statistically analyzed considering development stages. Growth was significantly slower Low-Fe treatment, suggesting that these cultures limited compared those flourished higher medium. Although concentration DOC increased 127.13 ± 8.38 150.51 ± 8.59 μmol C L−1 High-Fe conditions, respectively, no-significant variations found DOCER, among phases bioavailability scenarios. Under production hydroxamic inhibited, while rate compounds decreased, regarding conditions. also modified both moieties. present study, therefore, demonstrates availability stages might be key parameters regulating performance Fe-specific by cyanobacteria.