Light-dependent fluorescence variations in intact leaves

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Transient variations in the fluorescence from intact Phytolacca americana leaves. after the onset of illumination were measured under various light and dark conditions. Dark-adapted leaves when illuminated with strong light underwent an intensity variation with a peak; the fluorescence intensity reaching its peak several seconds after the onset of illumination then decreasing to a steady level. The peak height relative to the steady level increased with the increasing intensity of actinic light. Pre-illumination of the dark-adapted leaves with strong light caused a marked lowering of the peak. About 20 min of dark incubation was required for the light-adapted leaves to return to the dark-adapted state. All of the action spectra, for the peak, the steady level and the effect of light in post-illumination to inhibit recovery to the dark state, showed high bands due to chlorophyll b and carotenoid absorption and low bands due to chlorophyll a absorption. We concluded that the light absorbed by photosystem 2 is responsible for these phenomena.
日本植物生理学会の論文