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.