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Relative accumulation of flavonols after different treatments.
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Three filled leaves indicate the highest value within one study, three unfilled leaves the lowest one. The scale is a quantitative one. HPSL: High Pressure Sodium Lamp; FL-Tube: Fluorescent Tube; PPFD: Total Photosynthetic Photon Flux Density; HIDL: High Intensity Discharge Lamp; DLI: Day Light Integral. The asterisk indicates the control group, if available.
