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- W4308594143 abstract "Abstract 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." @default.
- W4308594143 created "2022-11-12" @default.
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- W4308594143 date "2022-11-08" @default.
- W4308594143 modified "2023-10-14" @default.
- W4308594143 title "Phosphate limitation intensifies negative effects of ocean acidification on globally important nitrogen fixing cyanobacterium" @default.
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- W4308594143 doi "https://doi.org/10.1038/s41467-022-34586-x" @default.
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