| Magnetic field protects plants against high light by slowing down production of singlet oxygen. | |
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MedLine Citation:
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PMID: 21288249 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Recombination of the primary radical pair of Photosystem II (PSII) of photosynthesis may produce the triplet state of the primary donor of PSII. Triplet formation is potentially harmful because chlorophyll triplets can react with molecular oxygen to produce the reactive singlet oxygen ((1) O(2) ). The yield of (1) O(2) is expected to be directly proportional to the triplet yield, and the triplet yield of charge recombination can be lowered with a magnetic field of 100-300 mT. In the present study, we illuminated intact pumpkin leaves with strong light in the presence and absence of a magnetic field and found that the magnetic field protects against photoinhibition of PSII. The result suggests that radical pair recombination is responsible for significant part of singlet oxygen production in the chloroplast. The magnetic field effect vanished if leaves were illuminated in the presence of lincomycin, an inhibitor of chloroplast protein synthesis, or if isolated thylakoid membranes were exposed to light. These data, in turn, indicate that (1) O(2) produced by the recombination of the primary charge pair is not directly involved in photoinactivation of PSII but instead damages PSII by inhibiting the repair of photoinhibited PSII. We also found that an Arabidopsis thaliana mutant lacking α-tocopherol, a scavenger of (1) O(2) , is more sensitive to photoinhibition than the wild type in the absence but not in the presence of lincomycin, confirming that the target of (1) O(2) is the repair mechanism. |
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Authors:
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Marja Hakala-Yatkin; Päivi Sarvikas; Petriina Paturi; Mika Mäntysaari; Heta Mattila; Taina Tyystjärvi; Ladislav Nedbal; Esa Tyystjärvi |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-3 |
Journal Detail:
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Title: Physiologia plantarum Volume: - ISSN: 1399-3054 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-2-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1256322 Medline TA: Physiol Plant Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © Physiologia Plantarum 2011. |
Affiliation:
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Molecular Plant Biology, Department of Biochemistry and Food Chemistry, FI-20014 University of Turku, Finland Wihuri Physical Laboratory, Department of Physics and Astronomy, FI-20014 University of Turku, Finland Department of Biological Dynamics, Institute of Systems Biology and Ecology CAS, Zamek 136, 37333 Nove Hrady, Czech Republic. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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