Figure 7:
Schematic illustration of two variants ofFv/Fm sensitivity to temperature.
Tolerant runs indicate that PSII activity and potentially linear
electron transport are unaffected at very high temperatures whereas
sensitive response is characterized by initiation ofFv/Fm activity decrease at low
temperatures followed by slow and gradual decline ofFv/Fm at higher temperatures.
This gradual decline window indicates PSII activity decline. The slow
decline could be due to possible protection mechanisms and possibly the
temperatures where cyclic electron transport ensues.