| Photoinactivation of Photosystem II: Is there more than one way to skin a cat? | |
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MedLine Citation:
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PMID: 21382038 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We briefly review the main mechanisms proposed for photodamage to photosystem II, at the donor and at the acceptor sides, and then discuss the mechanism whereby filamentous cyanobacteria inhabiting biological sand crusts such as Microcoleus sp. are able to avoid serious damage to their photosynthetic machinery. We show that the decline in fluorescence following exposure to excess light does not reflect a reduction in PSII activity but rather the activation of a non-radiative charge recombination in PSII. Further, we demonstrate that the difference in thermoluminescence peak temperature intensities in these organisms, in the presence and absence of inhibitors such as DCMU, is smaller than observed in model organisms suggesting that the redox gap between Q(A) (-) and P(680) (+) is smaller. Based on these data we propose that this could enable an alternative, pheophytin-independent recombination, thereby minimizing the damaging (1) O(2) production associated with radiative recombination. |
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Authors:
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Itzhak Ohad; Alex Berg; Simon M Berkowicz; Aaron Kaplan; Nir Keren |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-7 |
Journal Detail:
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Title: Physiologia plantarum Volume: - ISSN: 1399-3054 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-3-8 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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Department of Biological Chemistry, The Hebrew University of Jerusalem 91904, Edmond J. Safra campus, Givat Ram, Jerusalem, Israel Institute of Chemistry, The Hebrew University of Jerusalem 91904, Edmond J. Safra campus, Givat Ram, Jerusalem, Israel Department of Plants and Environmental Sciences and Arid Ecosystem Research Centre, The Hebrew University of Jerusalem 91904, Edmond J. Safra campus, Givat Ram, Jerusalem, Israel. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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