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Parallel changes in non-photochemical quenching properties, photosynthesis and D1 levels at sudden, prolonged irradiance exposures in Ulva fasciata Delile
Stockholm University.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
2007 (English)In: Journal of Photochemistry and Photobiology. B: Biology, ISSN 1011-1344, E-ISSN 1873-2682, Vol. 87, p. 18-26Article in journal (Refereed) Published
Abstract [en]

The photosynthetic response to a sudden and prolonged high irradiance exposure and following recovery at low irradiance were studiedwith the aim of investigating the ability to withstand and adapt to high irradiance without prior high light adaptation. When thalli ofUlva fasciata, accustomed to a low irradiance (80 lmol photons m2 s1), were exposed to a high irradiance (1500 lmol photonsm2 s1), the D1 protein was rapidly degraded, reaching a steady-state level after 110 min. This was followed by a fast recovery whenthalli were transferred to dim light. The overall ability of non-photochemical quenching of chlorophyll fluorescence decreased and levelledoff at a sudden and prolonged exposure to high irradiance and followed the same trend as the D1 level with a fast recovery in dimlight. Ulva had intrinsic means to acclimate rapidly to high irradiance, when non-photochemical quenching did not operate properly, bymaintaining a smaller fraction of high light tolerant PSII assemblages and by maintaining a high non-photochemical quenching capacityof chlorophyll fluorescence in relation to the variable fluorescence. The overall absorption of light (400–700 nm) remained high duringthe period of high irradiance exposure. When Ulva were deprived of nutrients in the form of PES media the ability of non-photochemicalquenching decreased at photoinhibitory conditions. The possible causes for the responses at prolonged irradiance and the mechanismsfor the decrease of non-photochemical quenching are discussed, with implications for field measurements. 2006 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2007. Vol. 87, p. 18-26
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Natural Sciences
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URN: urn:nbn:se:su:diva-138360OAI: oai:DiVA.org:su-138360DiVA, id: diva2:1066965
Available from: 2017-01-19 Created: 2017-01-19 Last updated: 2017-06-19Bibliographically approved

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Stockholm UniversityDepartment of Ecology, Environment and Plant Sciences
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Journal of Photochemistry and Photobiology. B: Biology
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CiteExportLink to record
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Citation style
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