| Contributions of visible and ultraviolet parts of sunlight to photoinhibition. | |
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MedLine Citation:
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PMID: 20798275 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Photoinhibition is light-induced inactivation of PSII, and action spectrum measurements have shown that UV light causes photoinhibition much more efficiently than visible light. In the present study, we quantified the contribution of the UV part of sunlight in photoinhibition of PSII in leaves. Greenhouse-grown pumpkin leaves were pretreated with lincomycin to block the repair of photoinhibited PSII, and exposed to sunlight behind a UV-permeable or UV-blocking filter. Oxygen evolution and Chl fluorescence measurements showed that photoinhibition proceeds 35% more slowly under the UV-blocking than under the UV-permeable filter. Experiments with a filter that blocks UV-B but transmits UV-A and visible light revealed that UV-A light is almost fully responsible for the UV effect. The difference between leaves illuminated through a UV-blocking and UV-transparent filter disappeared when leaves of field-grown pumpkin plants were used. Thylakoids isolated from field-grown and greenhouse-grown plants were equally sensitive to UV light, and measurements of UV-induced fluorescence from leaves indicated that the protection of the field-grown plants was caused by substances that block the passage of UV light to the chloroplasts. Thus, the UV part of sunlight, especially the UV-A part, is potentially highly important in photoinhibition of PSII but the UV-screening compounds of plant leaves may offer almost complete protection against UV-induced photoinhibition. |
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Authors:
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Marja Hakala-Yatkin; Mika Mäntysaari; Heta Mattila; Esa Tyystjärvi |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-08-26 |
Journal Detail:
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Title: Plant & cell physiology Volume: 51 ISSN: 1471-9053 ISO Abbreviation: Plant Cell Physiol. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-10-11 Completed Date: 2011-01-20 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9430925 Medline TA: Plant Cell Physiol Country: Japan |
Other Details:
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Languages: eng Pagination: 1745-53 Citation Subset: IM |
Affiliation:
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Molecular Plant Biology, Department of Biochemistry and Food Chemistry, University of Turku, FI-20014 Turku, Finland. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Chlorophyll
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analysis Cucurbita / metabolism, radiation effects Fluorescence Lincomycin / pharmacology Oxygen / analysis Photosystem II Protein Complex / metabolism, radiation effects* Plant Leaves / metabolism, radiation effects* Sunlight* Thylakoids / metabolism, radiation effects Ultraviolet Rays* |
| Chemical | |
Reg. No./Substance:
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0/Photosystem II Protein Complex; 1406-65-1/Chlorophyll; 154-21-2/Lincomycin; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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