Response of marine bacterioplankton pH homeostasis gene expression to elevated CO2

Human-induced ocean acidification impacts marine life. Marine bacteria are major drivers of biogeochemical nutrient cycles and energy fluxes; hence, understanding their performance under projected climate change scenarios is crucial for assessing ecosystem functioning. Whereas genetic and physiologi...

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Bibliographic Details
Published in:Nature Climate Change
Main Authors: Bunse, Carina, Lundin, Daniel, Karlsson, Christofer M.G., Akram, Neelam, Vila-Costa, Maria, Palovaara, Joakim, Svensson, Lovisa, Holmfeldt, Karin, González, José M., Calvo, Eva, Pelejero, Carles, Marrasé, Cèlia, Dopson, Mark, Gasol, Josep M., Pinhassi, Jarone
Format: Article in Journal/Newspaper
Language:English
Published: 2016
Subjects:
Life Science
Ocean acidification
Online Access:https://research.wur.nl/en/publications/response-of-marine-bacterioplankton-ph-homeostasis-gene-expressio
https://doi.org/10.1038/nclimate2914
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Summary:Human-induced ocean acidification impacts marine life. Marine bacteria are major drivers of biogeochemical nutrient cycles and energy fluxes; hence, understanding their performance under projected climate change scenarios is crucial for assessing ecosystem functioning. Whereas genetic and physiological responses of phytoplankton to ocean acidification are being disentangled, corresponding functional responses of bacterioplankton to pH reduction from elevated CO2 are essentially unknown. Here we show, from metatranscriptome analyses of a phytoplankton bloom mesocosm experiment, that marine bacteria responded to lowered pH by enhancing the expression of genes encoding proton pumps, such as respiration complexes, proteorhodopsin and membrane transporters. Moreover, taxonomic transcript analysis showed that distinct bacterial groups expressed different pH homeostasis genes in response to elevated CO2. These responses were substantial for numerous pH homeostasis genes under low-chlorophyll conditions (chlorophyll a <2.5 μg l-1); however, the changes in gene expression under high-chlorophyll conditions (chlorophyll a >20 μg l-1) were low. Given that proton expulsion through pH homeostasis mechanisms is energetically costly, these findings suggest that bacterioplankton adaptation to ocean acidification could have long-term effects on the economy of ocean ecosystems.

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