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ABSTRACT INVESTIGATING USE OF BLUE, RED, AND FAR-RED LIGHT FROM LIGHT-EMITTING DIODES TO REGULATE FLOWERING OF PHOTOPERIODIC ORNAMENTAL CROPS By Qingwu Meng When the natural photoperiod is short, lighting during the middle of the night (night interruption, NI) can promote flowering of long-day plants (LDPs) and inhibit flowering of short-day plants (SDPs). Unlike some conventional lamps, light-emitting diodes (LEDs) are energy efficient, durable, and controllable. We coordinated a trial with five commercial greenhouses to compare the efficacy of 4-hour NI lighting from red (R; 600 to 700 nm)+white (W)+far-red (FR; 700 to 800 nm) LEDs and conventional lamps to regulate flowering of eight photoperiodic ornamental crops. In most instances, the R+W+FR LEDs were as effective at controlling flowering as conventional lamps. Therefore, these LEDs specifically developed for flowering applications emit an effective spectrum and can replace less energy-efficient conventional lamps. In another experiment, we investigated the role of low-intensity (1 to 2 μmol∙m−2∙s−1) blue (B; 400 to 500 nm) light in regulating flowering of four LDPs and five SDPs. Low-intensity B light, alone and when added to R and FR light, did not influence flowering or plant morphology. In a third experiment, we determined whether B light at higher intensities (15 and 30 μmol∙m−2∙s−1) controlled flowering of five LDPs and one SDP. B light at 30 μmol∙m−2∙s−1 created long days in all crops as effectively as low-intensity R+W+FR light. However, the addition of B light to R+W+FR light did not further accelerate flowering. Therefore, the effectiveness of B light in NI lighting apparently depends on some threshold intensity and does not modify the response to R+W+FR light. The promotion of flowering from a higher irradiance of B light could be mediated by cryptochromes, phytochromes, or both.PDF Image | LED REGULATE FLOWERING OF PHOTOPERIODIC ORNAMENTAL CROPS
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