Ice plant growth and phytochemical concentrations are affected by light quality and intensity of monochromatic light-emitting diodes
- 112 Downloads
The ice plant (Mesembryanthemum crystallinum L.), widely known to be an effective cure for diabetes mellitus, is also a functional crop. This study was conducted to examine the effects of light quality and intensity of monochromatic light-emitting diodes (LEDs) on ice plant growth and phytochemical concentrations in a closed-type plant production system. Ice plant seedlings were transplanted into a deep floating technique system with a recycling nutrient solution (EC 4.0 dS m−1, pH 6.5). Fluorescent lamps, as well as monochromatic red (660 nm) and blue (450 nm) LEDs, were used at 120 ± 5 or 150 ± 5 µmol m−2 s−1 PPFD with a photoperiod of 14 h/10 h (light/dark) for 4 weeks. Ice plants showed higher growth under the high light intensity treatment, especially under the red LEDs. Furthermore, the SPAD value and photosynthetic rate were higher under the red LEDs with 150 µmol m−2 s−1 PPFD. The ice plant phytochemical composition, such as antioxidant activity and myo-inositol and pinitol concentrations, were highest under the blue LEDs with 150 µmol m−2 s−1 PPFD. Total phenolic concentration was highest under the blue LEDs with 120 µmol m−2 s−1 PPFD. Despite a slightly different dependence on light intensity, phytochemical concentrations responded positively to the blue LED treatments, as compared to other treatments. In conclusion, this study suggests that red LEDs enhance ice plant biomass, while blue LEDs induce phytochemical concentrations.
KeywordsDiabetic mellitus Fluorescent lamp Mesembryanthemum crystallinum L. Myo-inositol Pinitol
This research was supported by the Cooperative Research Program for Agriculture Science and Technology Development for Rural Development Administration, Republic of Korea (Project No. PJ01277301).
- Adams P, Thomas JC, Vernon DM, Bohnert HJ, Jensen RG (1992) Distinct cellular and organismic responses to salt stress. Plant Cell Physiol 33:1215–1223Google Scholar
- Johkan M, Shoji K, Goto F, Hashida S, Yoshihara T (2010) Blue light-emitting diode light irradiation of seedlings improves seedling quality and growth after transplanting in red leaf lettuce. HortScience 45:1809–1814Google Scholar
- Kim YJ, Kim HM, Hwang SJ (2016) Growth and phytochemical contents of ice plant as affected by light quality in a closed-type plant production system. Korean J Hortic Sci Technol 34:878–885Google Scholar
- Kozai T, Koto H, Nakayama C, Nozue M, Nishina H, Taniguchi A, Takachuzi M, Murase H, Sugimoto K et al (2011) Cultivation of ice plant. In: Nam SY, So CH, Cho GH (eds) Industrial of agriculture. RGB Press, Seoul, pp 135–143Google Scholar
- Narayanan CR, Joshi DD, Mujumdar AM, Dhekne VV (1987) Pinitol: a new antidiabetic compound from the leaves of Bougainvillea spectabilis. Curr Sci 56:139–141Google Scholar
- Niu G, Fujiwara K (2016) Light: physical properties of light and its measurement, light sources. In: Kozai T, Niu G, Takagaki M (eds) Plant factory: an indoor vertical farming system for efficient quality food production. Academic Press, San Diego, pp 115–127Google Scholar
- Nobel PS (2009) Light: light absorption by chlorophyll. In: Nobel PS (ed) Physicochemical and environmental plant physiology, 4th edn. Academic Press, Oxford, pp 199–201Google Scholar
- Shimizu H, Saito Y, Nakashima H, Miyasaka J, Ohdoi K (2011) Light environment optimization for lettuce growth in plant factory. Paper presented at the 18th IFAC World Congress, Milano, Italy, September 2011, pp 605–609Google Scholar
- Singleton VL, Rossi JA (1965) Colorimetry of total phenolics with phosphomolybdic-phosphotungstic acid reagents. Am J Enol Viticult 16:144–158Google Scholar
- Stutte GW, Edney S, Skerritt T (2009) Photoregulation of bioprotectant content of red leaf lettuce with light-emitting diodes. HortScience 44:79–82Google Scholar
- Winter K, Willert DJV (1972) NaCl induced crassulacean acid metabolism in Mesembryanthemum crystallinum. J Physiol 67:166–170Google Scholar