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http://dx.doi.org/10.12791/KSBEC.2019.28.1.1

Plant Growth and Ascorbic Acid Content of Spinacia oleracea Grown under Different Light-emitting Diodes and Ultraviolet Radiation Light of Plant Factory System  

Park, Sangmin (Dept. of Agricultural Science, Korea National Open University)
Cho, Eunkyung (Dept. of Agricultural Science, Korea National Open University)
An, Jinhee (Dept. of Agricultural Science, Korea National Open University)
Yoon, Beomhee (Dept. of Agricultural Science, Korea National Open University)
Choi, Kiyoung (Dept. of Controlled Agriculture, Kangwon National University)
Choi, Eunyoung (Dept. of Agricultural Science, Korea National Open University)
Publication Information
Journal of Bio-Environment Control / v.28, no.1, 2019 , pp. 1-8 More about this Journal
Abstract
The study aimed to determine effects of light emitting diode (LED) and the ultraviolet radiation (UVA) light of plant factory on plant growth and ascorbic acid content of spinach (Spinacia oleracea cv. Shusiro). Plants were grown in a NFT (Nutrient Film Technique) system for 28 days after transplanting with fluorescent light (FL, control), LEDs and UVA (Blue+UVA (BUV), Red and Blue (R:B(2:1)) + UVA (RBUV), Red+UVA (RUV), White LED (W), Red and Blue (R:B(2:1)), Blue (B), Red (R)) under the same light intensity ($130{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$) and photoperiod (16/8h = day/night). All the light sources containing the R (R, RB, RUV, and RBUV) showed leaf epinasty symptom at 21 days after transplanting (DAT). Under the RUV treatment, the lengths of leaf and leaf petiole were significantly reduced and the leaf width was increased, lowering the leaf shape index, compared to the R treatment. Under the BUV, however, the lengths of leaf and leaf petiole were increased significantly, and the leaf number was increased compared to B. Under the RBUV treatment, the leaf length was significantly shorter than other treatments, while no significant difference between the RBUV and RB for the fresh and dry weights and leaf area. Dry weights at 28 days after transplanting were significantly higher in the R, RUV and BUV treatments than those in the W and FL. The leaf area was significantly higher under the BUV treatment. The ascorbic acid content of the 28 day-old spinach under the B was significantly higher, followed by the BUV, and significantly lower in FL and R. All the integrated data suggest that the BUV light seems to be the most suitable for growth and quality of hydroponically grown spinach in a plant factory.
Keywords
leaf epinasty index; leaf shape index; specific leaf weight;
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