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Activities of PSI (1-фPSI0, A) and PSII (фPSII0, B) at 15 min and 135 min after heating the second mature leaf in hot water (n = 6). фPSI0, PSI quantum yield after 10-s illumination by far red light; фPSII0, PSII maximum quantum yield. Second mature leaf incubation in hot water (5 min, at different temperatures) was used for heating. Leaf was dried for 5 min after incubation. Dark adaptation before фPSI0 and фPSII0 registration was 10 min. *, p < 0.05 compared with controls.
