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Response of the Growth Characteristics and Phytochemical Contents of Pepper (Capsicum annuum L.) Seedlings with Supplemental LED Light in Glass House  

Azad, Md. Obyedul Kalam (Department of Horticulture and Breeding, School of Bioresource Sciences, Andong National University)
Chun, Ik-Jo (Department of Horticulture and Breeding, School of Bioresource Sciences, Andong National University)
Jeong, Jeong-Hak (Department of Horticulture and Breeding, School of Bioresource Sciences, Andong National University)
Kwon, Soon-Tae (Department of Horticulture and Breeding, School of Bioresource Sciences, Andong National University)
Hwang, Jae-Moon (Department of Horticulture and Breeding, School of Bioresource Sciences, Andong National University)
Publication Information
Journal of Bio-Environment Control / v.20, no.3, 2011 , pp. 182-188 More about this Journal
Abstract
This research was conducted to evaluate the effect of supplemental light-emitting diode (LED) light on growth characteristics and phytochemical content of pepper (Capsicum annuum L.) seedling using LED blue (470 nm, B), red (660 nm, R), blue + red (BR), far red (740 nm, FR) and UV-B (300 nm) light treatment, and without artificial light. Photon flux of LED light was 49, 16, 40, 5.0 and $0.82{\mu}mol\;m^{-2}s^{-1}$ for B, R, BR, FR, and UV-B light, respectively, during experiment. Supplemental LED light duration was $16hr\;day^{-1}$ and UV-B light duration was 10 min. per day after sunset up to 15 days (12 days after germination) of plants age. In our research, growth characteristics and phytochemical content of pepper seedlings were greatly influenced by supplemental LED light compare to control treatment. Red light increased the number of leaves, number of nodes, leaf width and plant fresh weight by 34%, 27%, 50% and 40%, respectively. Blue light increased the leaf length by 13%, and stem length and length of inter node were increased by 17% and 34%, respectively under grown far red light. After 15 days of light treatments phytochemical concentrations of pepper plants were significantly changed. Blue light enhanced the total anthocyanin and chlorophyll concentration by 6 times and 2 times, respectively. Red light increased the total phenolic compound at least two folds meanwhile far red light reduced the ascorbic acid and antioxidant activity 31% and 66%, respectively compared to control treatment.
Keywords
anthocyanin; antioxidant activity; ascorbic acid; baby leaf vegetables; chlorophyll; growth status; light quality; phenolic compound;
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