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Nonphotosynthetic Reduction of the Intersystem Electron Transport Chain of Chloroplasts Following Heat Stress. Steady‐state Rate
Author(s) -
Bukhov Nikolai G.,
Samson Guy,
Carpentier Robert
Publication year - 2000
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1562/0031-8655(2000)0720351nrotie2.0.co2
Subject(s) - electron transport chain , steady state (chemistry) , electron acceptor , intersystem crossing , chemistry , photosystem i , photosystem ii , electron donor , chlorophyll fluorescence , photochemistry , chloroplast , fluorescence , chlorophyll , photosynthesis , analytical chemistry (journal) , chromatography , biochemistry , physics , atomic physics , quantum mechanics , organic chemistry , singlet state , gene , excited state , catalysis
The consequence of elevated temperatures in the range of 39–51°C on the steady‐state rate of light‐induced electron transport through photosystem I (PSI) supported by stromal reductants was studied in intact barley leaves using photoacoustic and chlorophyll fluorescence techniques. Measurable electron flow through PSI in diuron‐treated leaves occurred only after exposure to temperatures above 37°C. The steady‐state rate of the above diuron‐insensitive electron flow with methyl viologen as electron acceptor was estimated to be 3.7 μeq m −2 s −1 or 0.018 μeq μmol chlorophyll −1 s −1 in leaves exposed for 5 min to 45°C.