Red alga Palmaria palmata-growth rate and photosynthetic performance under elevated CO2 treatment

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Erscheinungsjahr:
2017
Medientyp:
Text
Schlagworte:
  • Biomass
  • CO2
  • Fluorescence quenching
  • Palmaria palmata
  • Photosynthesis
  • Rhodophyta
Beschreibung:
  • © 2016, Springer Science+Business Media Dordrecht. Marine macroalgae offer a feasible solution for reducing CO 2 emissions by fixing CO 2 as algal biomass and thus providing a source of renewable energy. The perennial red alga Palmaria palmata was cultivated and supplied with increased CO 2 concentrations starting with 22 μmol kg −1 (pH 8.53) to 9770 μmol kg −1 (pH 6.04). Experiments covered test periods of 28 days, 7 days, and 2 h to examine the possible influence of different treatment durations. Biomass productivity over 28 days showed an increased production rate, which continuously declined with increasing CO 2 concentration. After 7 days, the productivity was below the controls, suggesting a lag phase or necessary adaptation period to elevated CO 2 concentrations of more than 7 days. Concerning the effects on maximum electron transport rate (ETR max ), light-harvesting efficiency (alpha), and light saturation of the photosynthetic electron transport (E k ), a stimulating influence was identified with the effect becoming more significant the shorter the test period was. The treatment with elevated CO 2 concentrations for 28 days led to a decrease in photochemical efficiency (Y(II)) and regulated nonphotochemical energy dissipation (Y(NPQ)). In contrast, the treatment duration of 7 days predominantly increased photochemical quenching whereas the 2-h treatment resulted in a significant increase in photochemical quenching and in a significant decrease in nonregulated nonphotochemical energy dissipation. Hence, elevated CO 2 concentrations over a prolonged time period interfered more distinctively with the fluorescence quenching ability of P. palmata.
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  • info:eu-repo/semantics/restrictedAccess
Quellsystem:
Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/518069bc-84a5-4eef-8f62-868df0b999fc