Maximum quantum yield after dark incubation (Fv/Fm) is typically very stable at values around 0.8 in healthy leaves. Fv/Fm correlates well with the quantum yield of photosynthesis measured as O2 production or CO2 uptake at low irradiance (Fig. 2). In particular, the reduction of the quantum yield by photoinhibition can be evaluated with this fluorescence parameter. A decrease in Fv/Fm can be due to a decrease in Fm and/or an increase in F0. A fast- and a slow-relaxing component can be distinguished. The fast component is alleviated within a few hours of low light or darkness
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