Origin of chlorophyll fluorescence in plants at 55 - 75 °C

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15410%2F03%3A00001404" target="_blank" >RIV/61989592:15410/03:00001404 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Origin of chlorophyll fluorescence in plants at 55 - 75 °C
Original language description
The origin of heat-induced chlorophyll fluorescence rise that appears at about 55 - 60 °C during linear heating of leaves, chloroplasts or thylakoids (especially with a reduced content of grana thylakoids) was studied. This fluorescence rise was earlierattributed to photosystem I emission. Our data show that the fluorescence rise originates from chlorophyll a (Chl a) molecules released from Chl-containing protein complexes denaturing at 55 - 60 °C. This conclusion results mainly from the Chl a fluorescence lifetime measurements with barley leaves of different Chl a content and absorption and emission spectra with barley leaves preheated to selected temperatures. This data, supported by the measurements of liposomes with a different Chl a/lipid ratio,suggests that the released Chl a is dissolved in lipids of thylakoid membranes and that with increasing Chl a content in the lipid phase the released Chl a tends to form low-fluorescing aggregates. This is probably the reason for the supp
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BO - Biophysics
OECD FORD branch
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Publication year
2003
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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