The complex effects of ocean acidification on the prominent N2-fixing cyanobacterium Trichodesmium

Haizheng Hong, Rong Shen, Futing Zhang, Zuozhu Wen, Siwei Chang, Wenfang Lin, Sven A. Kranz, Ya Wei Luo, Shuh Ji Kao, Francois M. M. Morel, Dalin Shi

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33 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)527-531
Number of pages5
JournalScience
Volume356
Issue number6337
DOIs
StatePublished - May 5 2017

All Science Journal Classification (ASJC) codes

  • General

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    Hong, H., Shen, R., Zhang, F., Wen, Z., Chang, S., Lin, W., Kranz, S. A., Luo, Y. W., Kao, S. J., Morel, F. M. M., & Shi, D. (2017). The complex effects of ocean acidification on the prominent N2-fixing cyanobacterium Trichodesmium. Science, 356(6337), 527-531. https://doi.org/10.1126/science.aal2981