EFFECT OF RED LED LAMP WITH WAVELENGTH OF 660 NM ON FLORAL BUD DIFFERENTIATION OF CHRYSANTHEMUM
From the viewpoint of prevention of global warming, the development of a new lamp in place of the incandescent lamp (INC) is a pressing need in light culture of chrysanthemum. In this study the floral bud differentiation under lighting of a 663 nm LED lamp (LED) and INC was investigated in Iwa no Hakusen and Jinba. After cutting, the rooted plants were cultured in an incubator at 23°C and were irradiated with fluorescent light and LED or INC from 8:00 to 20:00 and were irradiated with only LED or INC from 22:00 to 4:00. The INC strongly inhibited floral bud differentiation by the 4th week after cutting in Iwa no Hakusen and Jinba, and the LED also inhibited by the 4th week after cutting in the two cultivars. At the 5th week after cutting, there was no floral bud differentiation in Jinba by LED and INC irradiation treatment. While Iwa no Hakusen differentiated floral bud by LED, no floral differentiation was observed under INC irradiation treatment. We thought that this difference of floral differentiation response to 663 nm LED between Jinba and Iwa no Hakusen may derive from flowering type. Plant height under INC was significantly longer than that under LED. The leaf numbers under INC and LED had no significant difference.
Fukui, H., Yu, W., Uno, H., Kobayashi, N. and Sasaki, O. (2011). EFFECT OF RED LED LAMP WITH WAVELENGTH OF 660 NM ON FLORAL BUD DIFFERENTIATION OF CHRYSANTHEMUM. Acta Hortic. 907, 319-322
Chrysanthemum morifolium, internode elongation, 'Iwa no Hakusen', 'Jinba', phytochrome