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The complex effects of ocean acidification on the prominent N2-fixing cyanobacterium Trichodesmium
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 (Wash.) 356(6337): 527-531. https://dx.doi.org/10.1126/science.aal2981
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, meer
Peer reviewed article  
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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.
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.
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