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| Titel |
A red tide alga grown under ocean acidification upregulates its tolerance to lower pH by increasing its photophysiological functions |
| VerfasserIn |
S. Chen, J. Beardall, K. Gao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 17 ; Nr. 11, no. 17 (2014-09-11), S.4829-4837 |
| Datensatznummer |
250117587
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| Publikation (Nr.) |
 copernicus.org/bg-11-4829-2014.pdf |
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| Zusammenfassung |
| Phaeocystis globosa, a red tide alga, often forms blooms in or adjacent to coastal waters and
experiences changes in pH and seawater carbonate chemistry caused by either
diel/periodic fluctuation in biological activity, human activity or, in the
longer term, ocean acidification due to atmospheric CO2 rise. We
examined the photosynthetic physiology of this species while growing it
under different pH levels induced by CO2 enrichment and investigated
its acclimation to carbonate chemistry changes under different light levels.
Short-term exposure to reduced pHnbs (7.70) decreased the alga's
photosynthesis and light use efficiency. However, acclimation to the reduced
pH level for 1–19 generations led to recovered photosynthetic activity,
being equivalent to that of cells grown under pH 8.07 (control), though such
acclimation required a different time span (number of generations) under
different light regimes. The low-pH-grown cells increased their contents of
chlorophyll and carotenoids with prolonged acclimation to the acidification,
with increased photosynthetic quantum yield and decreased non-photochemical
quenching. The specific growth rate of the low-pH-grown cells also increased
to emulate that grown under the ambient pH level. This study clearly shows
that \textit{Phaeocystis globosa} is able to acclimate to seawater acidification by increasing its
energy capture and decreasing its non-photochemical energy loss. |
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