| Afterglow thermoluminescence band as a possible early indicator of changes in the photosynthetic electron transport in leaves. | |
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MedLine Citation:
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PMID: 16049770 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The afterglow (AG) band of thermoluminescence (TL) has been investigated in leaves of Arabidopsis thaliana. Excitation of dark-adapted leaves with two saturating single turn-over flashes induced the appearance of a complex TL glow curve that could be well simulated by three components: the two components, B1 and B2, of the usually called B-band, peaking at 18 and 26 degrees C, respectively, and a band with tmax at 41 degrees C, which we attributed to an AG emission. Illumination of dark-adapted leaves with 720 nm monochromatic and FR lights generated the emission of a sharp single band peaking also around at 41 degrees C, that it is usually assigned to an AG emission band. Dark-incubation of whole plants increased the intensity of AG-band in TL curves induced by two flashes and, in parallel, decreased B-bands. Selective illumination of leaves with light mostly absorbed by PS II (650 nm light) completely abolished the AG-band induced by two flashes, B-band being the only TL band observed. The single AG-band induced by 720 nm light was abolished if leaves were also illuminated with 650 nm light. On the other hand, AG-band could be restored if 650 nm illuminated leaves were afterwards illuminated with 720 nm light. The changes in the intensity of B and AG bands induced by selective illuminations seem to be related to alterations in the redox state of QB and plastoquinone pool. |
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Authors:
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Mercedes Roncel; José M Ortega |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Photosynthesis research Volume: 84 ISSN: 0166-8595 ISO Abbreviation: Photosyn. Res. Publication Date: 2005 Jun |
Date Detail:
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Created Date: 2005-07-28 Completed Date: 2006-01-11 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 100954728 Medline TA: Photosynth Res Country: Netherlands |
Other Details:
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Languages: eng Pagination: 167-72 Citation Subset: IM |
Affiliation:
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Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla y CSIC, Américo Vespucio 49, 41092 Sevilla, Spain. mroncel@us.es |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Arabidopsis
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metabolism* Electron Transport Light Luminescence* Photosynthesis / physiology* Photosystem II Protein Complex / chemistry, metabolism Plant Leaves / metabolism* Temperature |
| Chemical | |
Reg. No./Substance:
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0/Photosystem II Protein Complex |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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