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.
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Vol. 72 • No. 3