Growth rate, short-term N2 fixation rate, K1/2(DIC), cytosolic pH, and protein abundance of Trichodesmium IMS101, and diazotroph community composition, N2 fixation rate and nifH gene transcription of Trichodesmium spp. collected from NSCS surface water ...
Acidification of seawater caused by anthropogenic carbon dioxide (CO2) is anticipated to influence the growth of dinitrogen (N2)-fixing phytoplankton, which contribute a large fraction of primary production in the tropical and subtropical ocean. We found that growth and N2-fixation of the ubiquitous...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
2017
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.874127 https://doi.pangaea.de/10.1594/PANGAEA.874127 |
| Summary: | Acidification of seawater caused by anthropogenic carbon dioxide (CO2) is anticipated to influence the growth of dinitrogen (N2)-fixing phytoplankton, which contribute a large fraction of primary production in the tropical and subtropical ocean. We found that growth and N2-fixation of the ubiquitous cyanobacterium Trichodesmium decreased under acidified conditions, notwithstanding a beneficial effect of high CO2. Acidification resulted in low cytosolic pH and reduced N2-fixation rates despite elevated nitrogenase concentrations. Low cytosolic pH required increased proton pumping across the thylakoid membrane and elevated adenosine triphosphate production. These requirements were not satisfied under field or experimental iron-limiting conditions, which greatly amplified the negative effect of acidification. ... : Supplement to: Hong, Haizheng; Shen, Rong; Zhang, Futing; Wen, Zuozhu; Chang, Siwei; Lin, Wenfang; Kranz, Sven A; Luo, Ya-Wei; Kao, Shuh-Ji; Morel, Francois M M; Shi, Dalin (2017): The complex effects of ocean acidification on the prominent N2-fixing cyanobacterium Trichodesmium. Science, 356(6337), 527-531 ... |
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