Measuring Instant Light-Response Curve of Chlorophyll Fluorescence in Sago Palm (Metroxylon sagu Rottb.) Leaves: Different Time Measurements on Dark and Light-Adapted Leaf

This study aimed to determine the appropriate time for chlorophyll fluorescence light curve measurement in sago palms and avoid high values variations. The photosynthetic status of three-year-old palm seedlings was evaluated through measurement. under different daytime measurements. Observations on DFm/Fm’ ETR vs. irradiances were conducted leaves morning, midday, afternoon with dark adaptation. highest ETRmax value found a light-adapted leaf; however, Eopt could not be obtained. Morning dark-adapted leaf is most method get an ETRmax.