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Flowering Control by Using Red Light of Chrysanthemum
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 Title & Authors
Flowering Control by Using Red Light of Chrysanthemum
Hong, Seung-Chang; Kwon, Soon-Ik; Kim, Min-Kyeong; Chae, Mi-Jin; Jung, Goo-Bok; So, Kyu-Ho;
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BACKGROUND: The incandescent bulb and compact fluorescent lamp are widely using as a light sources for daylength extension of chrysanthemum. But, these light sources consume a lot of electricity and have short longevity. A light-emitting diode (LED) is a semi conductor light source. LEDs have many advantages over incandescent light sources including lower energy consumption, longer lifetime. In this study, we investigated the intensity of red light to control flowering of chrysanthemum (Dendranthema grandiflorum cv. "Shinma") by using LEDs. METHODS AND RESULTS: The red (660 nm) and far-red (730 nm) light were irradiated subsequently to investigate photo-reversible flowering responses of chrysanthemum. The flowering of chrysanthemum was inhibited by night interruption with red light but subsequently irradiated far-red light induced the flowering of chrysanthemum. This photoreversibility, reversion of the inductive effect of a brief red light pulse by a subsequent far-red light pulse, is a property of photo responses regulated by the plant photoreceptor phytochrome B. Four different intensity of red light of 0.7, 1.4, 2.1, and (PAR) were irradiated at growth room in order to determine the threshold for floral inhibition of chrysanthemum. Over of the red lights irradiated chrysanthemums were not flowered. The plant length, fresh weight, number of leaves, and leaf area of chrysanthemum irradiated with red light were increased by 17%, 36%, 11%, and 48%, respectively, compared to those of compact fluorescent lamp. CONCLUSION(S): The red light and subsequential far-red light showed that the photoreversibility on flowering of chrysanthemum. The red light ( of red LEDs) and white light (50 Lux of compact fluorescent lamp) have the same effect on inhibition of flowering in chrysanthemum. Additionally, the red light increased the plant height and dry weight of chrysanthemum.
Chrysanthemum;Daylength extension;Flowering;Photoreversibility;Red light intensity;
 Cited by
적색광에 의한 딸기재배의 일장연장 효과,홍성창;김민경;김명현;최순군;어진우;정구복;소규호;

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