Nonphotosynthetic reduction of the intersystem electron transport chain of cholorplasts following heat stress. Steady-state rate

The consequence of elevated temperatures in the range of 39-51 degrees 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. Measurabl...

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Bibliographic Details
Published inPhotochemistry and photobiology Vol. 72; no. 3; p. 351
Main Authors Bukhov, Nikolai G, Samson, Guy, Carpentier, Robert
Format Journal Article
LanguageEnglish
Published Lawrence Blackwell Publishing Ltd 01.09.2000
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Summary:The consequence of elevated temperatures in the range of 39-51 degrees 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 degrees C. The steady-state rate of the above diuron-insensitive electron flow with methyl viologen as electron acceptor was estimated to be 3.7 mu eq m-2 s-1 or 0.018 mu eq mumol chlorophyll-1 s-1 in leaves exposed for 5 min to 45 degrees C.
ISSN:0031-8655
1751-1097