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 μmol·m-2·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.

본 연구에서는 인공광 광질에 따른 곰보배추의 생육, 엽형 및 항산화능을 비교하였다. 정식 후 56일째에 측정 된 엽장, 엽폭 및 엽수는 적색 LED(R)와 대조구인 형광등(FL) 처리구에서 유의적으로 높았고 혼합광(RB2:1)과 백색 LED(W) 처리구에서 낮았다. 엽형지수(엽장/엽폭)도 적색 LED(R)와 대조구인 형광등(FL) 처리구에서 유의적으로 높았고 혼합광(RB2:1)과 백색 LED(W) 처리구에서 낮았다. 지상부 생체중, 건물중 및 엽면적 모두 적색 LED(R) 처리구에서 가장 높았고 형광등(FL)과 청색 LED(B) 처리구가 그 다음으로 높게 나타났으며 혼합광 (RB2:1)과 백색 LED(W) 처리구에서 낮았다. 잎의 수하 현상은 정식 21일 이후부터 적색 LED(R)와 혼합광 (RB2:1) 처리구에서만 발생하였다. 엽록소 함량은 적색 LED(R) 처리구에서 가장 낮았다. 비엽중은 청색 LED(B) 처리구에서 가장 높았고 형광등(FL) 처리구에서 가장 낮았다. DPPH free radical 소거활성은 처리 간 유의차가 없었다. 위의 결과들을 종합하여 볼 때 형광등이 곰보배추를 실내에서 인공으로 재배 시 적합한 광원으로 판단된다.