| Presence of 'PSI free' LHCI and monomeric LHCII and subsequent effects on fluorescence characteristics in lincomycin treated maize. | |
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MedLine Citation:
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PMID: 16292567 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The cause of the strong non-photochemical fluorescence quenching was examined in maize (Zea mays L.) plants that were treated with lincomycin during the 72 h period of greening. They were deficient in core complexes but seemed to contain the full complement of antennae. The following results were obtained: (1) High F(o) could not be attributed to the dark reduction of Q(A) but to the presence of a high amount of not properly organized antenna complexes due to the inhibited synthesis of reaction centres. (2) On illumination fluorescence intensity dropped considerably below F(o) within 20 s, and reached a steady state still below F(o). (3) Slowly relaxing part of non-photochemical quenching was significantly higher than in control plants. (4) De-epoxidation state was constant, and corresponded to the maximal value of the control. (5) Free Lhca1/4 dimers could be detected in all submembrane fractions, including the grana, obtained by digitonin fractionation. (6) Increase in the 679 and 700 nm fluorescence emissions could be attributed to the monomerisation of part of LHCII and to the presence of free Lhca2 or LHCII aggregates, respectively. (7) LHCII or PSII+LHCII and Lhca1/4 interaction may contribute to the increase of long-wavelength fluorescence in the granal fraction. We assume that the elevated fluorescence quenching of monomeric LHCII as well as the interaction between LHCII or PSII+LHCII and Lhca1/4 can be considered as an explanation for the extensive non-photochemical fluorescence quenching in lincomycin treated plants. The permanent presence of zeaxanthin may have contributed to the fast formation of quenching. |
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Authors:
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László Gáspár; Eva Sárvári; Fermín Morales; Zoltán Szigeti |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2005-11-15 |
Journal Detail:
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Title: Planta Volume: 223 ISSN: 0032-0935 ISO Abbreviation: Planta Publication Date: 2006 Apr |
Date Detail:
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Created Date: 2006-03-24 Completed Date: 2006-09-11 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 1250576 Medline TA: Planta Country: Germany |
Other Details:
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Languages: eng Pagination: 1047-57 Citation Subset: IM |
Affiliation:
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Department of Plant Physiology and Molecular Plant Biology, Eötvös Loránd University, Pázmány Péter sétány 1/c, 1117 Budapest, Hungary. laszlo_gaspar@hotmail.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Anti-Bacterial Agents
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pharmacology* Carotenoids / metabolism Chlorophyll / metabolism Chloroplasts / drug effects Fluorescence* Light Lincomycin / pharmacology* Photosynthetic Reaction Center Complex Proteins / drug effects* Zea mays / drug effects* |
| Chemical | |
Reg. No./Substance:
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0/Anti-Bacterial Agents; 0/Photosynthetic Reaction Center Complex Proteins; 1406-65-1/Chlorophyll; 154-21-2/Lincomycin; 36-88-4/Carotenoids |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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