Publication Date:
2024-03-22
Description:
Growth of the prominent nitrogen-fixing cyanobacterium Trichodesmium is often limited by phosphorus availability in the ocean. How nitrogen fixation by phosphorus-limited Trichodesmium may respond to ocean acidification remains poorly understood. Here, we use phosphate-limited chemostat experiments to show that acidification enhanced phosphorus demands and decreased phosphorus-specific nitrogen fixation rates in Trichodesmium. The increased phosphorus requirements were attributed primarily to elevated cellular polyphosphate contents, likely for maintaining cytosolic pH homeostasis in response to acidification. Alongside the accumulation of polyphosphate, decreased NADP(H):NAD(H) ratios and impaired chlorophyll synthesis and energy production were observed under acidified conditions. Consequently, the negative effects of acidification were amplified compared to those demonstrated previously under phosphorus sufficiency. Estimating the potential implications of this finding, using outputs from the Community Earth System Model, predicts that acidification and dissolved inorganic and organic phosphorus stress could synergistically cause an appreciable decrease in global Trichodesmium nitrogen fixation by 2100.
Keywords:
Adenosine 5-Triphosphate, per cell; Alkaline phosphatase, para-Nitrophenylphosphate per cell; Alkalinity, total; Aragonite saturation state; Bacteria; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, organic, particulate/Phosphorus, organic, particulate ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell, length; Cell, length, standard deviation; Cell, width; Cell, width, standard deviation; Cell density; Chlorophyll a; Chlorophyll a per cell; Cyanobacteria; Day of experiment; Entire community; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gene copies; Gene expression; Gene expression (incl. proteomics); Glutamate per cell; Growth/Morphology; Laboratory experiment; Laboratory strains; LATITUDE; Lipids per cell; LONGITUDE; Macro-nutrients; Micro-nutrients; Nicotinamide adenine dinucleotide phosphate; Nicotinamide adenine dinucleotide phosphate/Reduced nicotinamide adenine dinucleotide ratio; Nitrogen, organic, particulate/Phosphorus, organic, particulate ratio; Nitrogen fixation rate; Nitrogen fixation rate, per cell; North Pacific; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Other metabolic rates; Other studied parameter or process; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon, per cell; Particulate organic nitrogen per cell; Particulate organic phosphorus per cell; Pelagos; pH; Phosphorus, reactive soluble; Photosynthetic carbon fixation rate; Photosynthetic carbon fixation rate per cell; Phytoplankton; Polyphosphate as femto-equivalents of the standard per cell; Primary production/Photosynthesis; Reduced nicotinamide adenine dinucleotide; Relative transcription; Replicate; Ribonucleic acid per cell; Salinity; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Station label; Temperature, water; Time point, descriptive; Treatment; Trichodesmium erythraeum; Tropical; Type
Type:
Dataset
Format:
text/tab-separated-values, 6821 data points
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