Document Detail


Rapid chlorophyll a fluorescence transient of Lemna gibba leaf as an indication of light and hydroxylamine effect on photosystem II activity.
MedLine Citation:
PMID:  17487305     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Rapid chlorophyll fluorescence transient induced by saturating flash (3000 micromol of photons m-2 s-1) was investigated when Lemna gibba had been exposed to light (100 micromol of photons m-2 s-1) causing the Kautsky effect or in low light intensity unable to trigger PSII photochemistry. Measurements were made by using, simultaneously, a pulse amplitude modulated fluorometer and plant efficiency analyzer system, either on non-treated L. gibba leaf or those treated with different concentrations of hydroxylamine (1-50 mM) causing gradual inhibition of the water splitting system. When any leaf was exposed to continuous light during the Kautsky effect, a rapid fluorescence transient may reflect current activity of photosystem II within the photosystem II complex. Under those conditions, a variation of transition steps appearing over time was related to a drastic change to the photosystem II functional properties. This value indicated that the energy dissipation through non-photochemical pathways was undergoing extreme change. The change of rapid fluorescence transient, induced under continuous light, when compared to those obtained under very low light intensity, confirmed the ability of photosystem II to be capable to undergo rapid adaptation lasting about two minutes. When the water splitting system was inhibited and electron donation partially substituted by hydroxylamine, the adaptation ability of photosystem II to different light conditions was lost. In this study, the change of rapid fluorescence kinetic and transient appearing over time was shown to be a good indication for the change of the functional properties of photosystem II induced either by light or by hydroxylamine.
Authors:
David Dewez; Nadia Ait Ali; François Perreault; Radovan Popovic
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-02-12
Journal Detail:
Title:  Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology     Volume:  6     ISSN:  1474-905X     ISO Abbreviation:  Photochem. Photobiol. Sci.     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-05-09     Completed Date:  2007-08-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101124451     Medline TA:  Photochem Photobiol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  532-8     Citation Subset:  IM    
Affiliation:
Department of Chemistry, Environmental Toxicology Research Center (TOXEN), University of Quebec in Montreal, 2101 Jeanne-Mance, Montreal, Province of Quebec, Canada H2X 2J6.
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MeSH Terms
Descriptor/Qualifier:
Araceae / metabolism*,  radiation effects*
Chlorophyll / chemistry,  metabolism*
Hydroxylamine / pharmacology*
Light*
Photosystem II Protein Complex / metabolism*
Plant Leaves / metabolism*,  radiation effects
Chemical
Reg. No./Substance:
0/Photosystem II Protein Complex; 1406-65-1/Chlorophyll; 479-61-8/chlorophyll a; 7803-49-8/Hydroxylamine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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