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rdf:type |
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lifeskim:mentions |
umls-concept:C0034435,
umls-concept:C0162741,
umls-concept:C0175668,
umls-concept:C0205217,
umls-concept:C0205225,
umls-concept:C0392747,
umls-concept:C0443172,
umls-concept:C0599132,
umls-concept:C0683598,
umls-concept:C1326520,
umls-concept:C1709375
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pubmed:issue |
4
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pubmed:dateCreated |
2003-8-12
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pubmed:abstractText |
Exposure of control (non-hardened) Arabidopsis leaves for 2 h at high irradiance at 5 degrees C resulted in a 55% decrease in photosystem II (PSII) photochemical efficiency as indicated by F(v)/F(m). In contrast, cold-acclimated leaves exposed to the same conditions showed only a 22% decrease in F(v)/F(m). Thermoluminescence was used to assess the possible role(s) of PSII recombination events in this differential resistance to photoinhibition. Thermoluminescence measurements of PSII revealed that S(2)Q(A)(-) recombination was shifted to higher temperatures, whereas the characteristic temperature of the S(2)Q(B)(-) recombination was shifted to lower temperatures in cold-acclimated plants. These shifts in recombination temperatures indicate higher activation energy for the S(2)Q(A)(-) redox pair and lower activation energy for the S(2)Q(B)(-) redox pair. This results in an increase in the free-energy gap between P680(+)Q(A)(-) and P680(+)Pheo(-) and a narrowing of the free energy gap between primary and secondary electron-accepting quinones in PSII electron acceptors. We propose that these effects result in an increased population of reduced primary electron-accepting quinone in PSII, facilitating non-radiative P680(+)Q(A)(-) radical pair recombination. Enhanced reaction center quenching was confirmed using in vivo chlorophyll fluorescence-quenching analysis. The enhanced dissipation of excess light energy within the reaction center of PSII, in part, accounts for the observed increase in resistance to high-light stress in cold-acclimated Arabidopsis plants.
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pubmed:commentsCorrections |
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-10198098,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-11069711,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-11101299,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-11115886,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-11346948,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-11556790,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-11607279,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-11722132,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-11800395,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-11960736,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-12105211,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-16668849,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-19431730,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-2404518,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-486438,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-7603975,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-8318516,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-8431425,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-9351245,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-9391170,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-9668132,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-9688557,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-9860848,
http://linkedlifedata.com/resource/pubmed/commentcorrection/12913169-9888817
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pubmed:language |
eng
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pubmed:journal |
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pubmed:citationSubset |
IM
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pubmed:chemical |
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pubmed:status |
MEDLINE
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pubmed:month |
Aug
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pubmed:issn |
0032-0889
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pubmed:author |
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pubmed:issnType |
Print
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pubmed:volume |
132
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
2144-51
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pubmed:dateRevised |
2010-9-14
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pubmed:meshHeading |
pubmed-meshheading:12913169-Acclimatization,
pubmed-meshheading:12913169-Arabidopsis,
pubmed-meshheading:12913169-Cold Temperature,
pubmed-meshheading:12913169-Electron Transport,
pubmed-meshheading:12913169-Fluorescence,
pubmed-meshheading:12913169-Kinetics,
pubmed-meshheading:12913169-Light,
pubmed-meshheading:12913169-Light-Harvesting Protein Complexes,
pubmed-meshheading:12913169-Membrane Potentials,
pubmed-meshheading:12913169-Photosynthetic Reaction Center Complex Proteins,
pubmed-meshheading:12913169-Photosystem II Protein Complex,
pubmed-meshheading:12913169-Plant Leaves,
pubmed-meshheading:12913169-Quinones
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pubmed:year |
2003
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pubmed:articleTitle |
Changes in the redox potential of primary and secondary electron-accepting quinones in photosystem II confer increased resistance to photoinhibition in low-temperature-acclimated Arabidopsis.
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pubmed:affiliation |
Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå S-901 87, Sweden.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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