Red Light-emitting Diode Light Irradiation Improves Root and Leaf Formation in Difficult-to-propagate Protea cynaroides L. Plantlets In Vitro

NHUIR > College of Science and Technology > Department of Natural Biotechnology > Periodical Articles > Item 987654321/25146

Please use this identifier to cite or link to this item: http://nhuir.nhu.edu.tw/handle/987654321/25146

Title:	Red Light-emitting Diode Light Irradiation Improves Root and Leaf Formation in Difficult-to-propagate Protea cynaroides L. Plantlets In Vitro
Authors:	吳澔群;Wu, How-Chiun;Lin, Chun-Chih
Contributors:	自然生物科技學系
Keywords:	3,4-dihydroxybenzoic acid;blue light;caffeic acid;King Protea;red light
Date:	2012
Issue Date:	2017-08-09 11:36:22 (UTC+8)
Abstract:	The effects of light quality emitted by light-emitting diodes (LEDs) on the growth and morphogenesis, and concentrations of endogenous phenolic compounds of Protea cynaroides L. plantlets in vitro, were investigated. Plantlets were cultured under four light treatments: conventional fluorescent lamps (control), red LEDs (630 nm), blue LEDs (460 nm), and red + blue LEDs (1:1 photosynthetic photon flux). Four phenolic compounds extracted from the plantlets were analyzed: 3,4-dihydroxybenzoic acid, gallic acid, caffeic acid, and ferulic acid. The highest rooting percentagewas observed in plantlets cultured under red LEDs (67%) compared with 7%under conventional white fluorescent light, 13%under blue LEDs, and 13%under red + blueLEDs. The highest number of roots per plantlet was also found under red LEDs, whereas a significantly lower number of roots per plantlet was obtained under the other light treatments. Furthermore, red light promoted the formation of new leaves in P. cynaroides plantlets. However, the highest leaf dry weight (53.8 mg per plantlet) was found in plantlets irradiated by the combination of red and blue LEDs. Phenolic analyses showed that the lowest concentrations of 3,4- dihydroxybenzoic acid (4.3 mg·g⁻¹), gallic acid (7.0 mg·g⁻¹), and ferulic acid (7.4 mg·g⁻¹) were detected in plantlets exposed to red light, whereas those irradiated by white fluorescent light contained the highest concentration. A significant inverse correlation (r = –0.419) was established between 3,4-dihydroxybenzoic acid and rooting percentage. Strong inverse correlations were also established between 3,4-dihydroxybenzoic acid and number of roots per plantlet (r = –0.768) as well as between ferulic acid and number of roots per plantlet (r = –0.732). These results indicate that the stimulation of root formation in P. cynaroides plantlets under red LEDs is the result of the low endogenous concentrations of 3,4-dihydroxybenzoic acid and ferulic acid.
Relation:	HORTSCIENCE vol. 47 pp.1490-1494
Appears in Collections:	[Department of Natural Biotechnology] Periodical Articles

Files in This Item:

File	Description	Size	Format
Red Light-emitting Diode.pdf		518Kb	Adobe PDF	542	View/Open

Loading...