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Background : This study was conducted to select a optimal combination of LED light sources for stable production of sprout ginseng used as vegetables throughout the year.
Methods and Results : The treatments to select the optimum LED light source for the production of functional sprout ginseng were ①Blue40%: Green40%: Red40% (B40 + G12 + R20 umol·m-2S-1), ②B50: G25: R10 (B50 + G8 + R5 umol·m-2S-1), ③B50: G20: R40 (B50 + G6 + R20 umol·m-2S-1), ④B35: G20: R35 (B35 + G6 + R18 umol·m-2S-1), ⑤B20: G0: R40 (B20 + R20 umol·m-2S-1), ⑥control (a general fluorescent lamp for plant cultivation, FL40W, PG, 35.0 umol). The ginseng seedlings used in the test were subject to preconditioning process for one week after the cold treatment at 4℃ for at least three months. The root media were composed of porous artificial soil 40% + peat moss 30% + perlite 20% + Vomito (brand name)10%. We planted 35 seedlings (planting density 5 × 7 ㎝) in a 480 × 380 × 295 ㎜ plastic box. The two liters of water were irrigated per a plastic box when water potential reached -33 kPa using a tensimeter. The cultivation room was maintained at 25℃ with 45% of the relative humidity, and 16 hours of lighting for growing conditions. The growing period was 40 to 60 days after planting. The results were as follows; the treatment of LED B50%: G25%: R10% (B50 + G8 + R5 umol·m-2S-1) increased the diameter of the sprout ginseng by 10.3% (4.95 → 5.46 ㎜), root weight 27.3% (1.1 → 1.4 g), fresh weight 38.9% (1.8 → 2.5 g) in comparison with the control. The contents of ginsenoside such as Re, Rg2, Rc, Rb2, and Rd increased 24.2% (24.8 → 30.8 ㎎/g).
Conclusion : The optimal light source for sprout ginseng was LED B50%: G25%: R10% (B50 + G8 + R5 umol·m-2S-1), which increased sprout production by 38.9% in comparison with the control.
