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.
Translator Disclaimer
ACCESS THE FULL ARTICLE
It is not available for individual sale.
This article is only available to subscribers.
It is not available for individual sale.
It is not available for individual sale.
Photochemistry and Photobiology
Vol. 72 • No. 3
September 2000
Vol. 72 • No. 3
September 2000