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http://dx.doi.org/10.12972/kjhst.20160092

Growth and Phytochemical Contents of Ice Plant as Affected by Light Quality in a Closed-type Plant Production System  

Kim, Young Jin (Division of Applied Life Science, Graduate School of Gyeongsang National University)
Kim, Hye Min (Division of Applied Life Science, Graduate School of Gyeongsang National University)
Hwang, Seung Jae (Division of Applied Life Science, Graduate School of Gyeongsang National University)
Publication Information
Horticultural Science & Technology / v.34, no.6, 2016 , pp. 878-885 More about this Journal
Abstract
A study was conducted to examine the effects of light quality on the growth and phytochemical contents of ice plant in a closed-type plant production system. Seeds were sown in a 128-cell plug tray using rockwool. The seedlings were then transplanted into a deep floating technique system with recirculating nutrient solution (EC $1.5dS{\cdot}m^{-1}$, pH 6.5) in a closed-type plant production system. The nutrient solution was supplied at two weeks after transplanting with 2.0 mM NaCl concentration in all treatments for the development of the bladder cells. The three light sources with different light qualities used were as followed; FL (fluorescent lamps), combined RW LED (red:white = 7:3), and combined RBW LED (red:blue:white = 8:1:1) at $150{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ PPFD with a photoperiod of 14/10 hours (light/dark). The results showed that the FL treatment had the greatest growth enhancement effects on the leaf area and the fresh and dry weights of the shoots and roots. The SPAD values were significantly higher under the FL and RBW LED treatments, at 29.8 and 30.6, respectively. No significant difference was observed in salinity under all treatments. Chlorophyll fluorescence was significantly higher under the FL treatment. The total phenol content and antioxidant activity were the highest under the RBW LED treatment. The total flavonoid content was significantly higher under the RBW LED and FL treatments. Hence, the results indicate that the growth of ice plant was maximized under the FL treatment. The phytochemical contents were maximized under the RBW LED treatment.
Keywords
bladder cell; fluorescent lamp; light emitting diode; Mesembryanthemum crystallinum L.; salinity;
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