Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Effects of Supplemental UV-A LED Radiation on Growth and Bioactive Compounds in Spinach

시금치에서 생장 및 생리활성물질에 대한 UV-A LED의 보광 효과

  • Da-Seul Choi (Division of Animal, Horticultural, and Food Sciences, Chungbuk National University) ;
  • Jin-Hui Lee (Department of Practice Arts Education, Jeonju National University of Education) ;
  • Myung-Min Oh (Division of Animal, Horticultural, and Food Sciences, Chungbuk National University)
  • 최다슬 (충북대학교 축산.원예.식품공학부 원예학전공 ) ;
  • 이진희 (전주교육대학교 실과교육과 ) ;
  • 오명민 (충북대학교 축산.원예.식품공학부 )
  • Received : 2024.01.05
  • Accepted : 2024.01.26
  • Published : 2024.01.31
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Abstract

A proper level of UV-A light treatment in terms of intensity, spectrum, and exposure duration is known to have a positive impact on plant growth, photosynthesis, and the biosynthesis of secondary metabolites. However, there are few studies investigating the physiological responses of spinach (Spinacia oleracea L.) to UV radiation. Hence, this study aimed to assess the effects of short-term UV-A radiation on the growth and bioactive compounds of spinach. Spinach seedlings were cultivated in a vertical farm module under the following environmental conditions: photosynthetic photon flux density 200 µmol·m-2·s-1, white LED, 12 h on/off, 20℃ air temperature, 70% relative humidity, and 500 µmol·mol-1 CO2 concentration. After 5 weeks of sowing, the seedlings were subjected to continuous UV-A (peak wavelength; 385 nm) irradiation at two different energy levels: 20 W·m-2 and 40 W·m-2 for 7 days. As a result, the UV-A20W treatment increased the shoot fresh and dry weights of spinach. However, there were no significant differences observed in photosynthetic parameters between the UV-A treatments and the control. The maximum quantum efficiency of photosystem II (Fv/Fm) consistently decreased across all UV-A treatments for 7 days in UV-A treatments. Additionally, the total phenolic content and antioxidant capacity increased in the UV-A20W treatment at 7 days of treatment as well as the total flavonoid content significantly increased at 5 and 7 days of treatment. These findings suggest that supplemental UV-A LED radiation can enhance the growth and quality of spinach cultivated in closed type plant production systems such as vertical farms.

본 연구에서는 단기간의 UV-A 조사가 시금치(Spinacia oleracea L.)의 생장과 생리활성물질에 미치는 영향을 평가하였다. 시금치 묘는 200µmol·m-2·s-1 PPFD, white LED, 광주기 12시간, 온도 20℃, 상대습도 70%, 이산화탄소 농도 500µmol·mol-1의 수직농장 모듈에서 재배되었다. 파종 후 5주된 묘는 7일 동안 20W·m-2와 40W·m-2의 두 가지 에너지 수준에서 연속적으로 UV-A(피크파장: 385nm) 조사한 후 생육 특성, 광합성 파라미터, 이미지 형광, 총 페놀 함량, 항산화도, 그리고 총 플라보노이드 함량을 분석하였다. 결과적으로, UV-A20W 처리는 시금치의 생체중과 건물중을 증가시켰다. 하지만, UV-A 처리구와 대조구 사이의 광합성 파라미터에는 유의한 차이가 나타나지 않았다. 광계II의 최대양자수율(Fv/Fm)은 모든UV-A 처리에서 7일동안 지속적으로 감소했다. 또한, UV-A20W 처리에서 식물체당 총 페놀 함량과 항산화도는 처리 7일째 증대되었으며, 총 플라보노이드 함량은 처리 5일째부터 유의적으로 증가하였다. 이러한 결과는 UV-A LED 보광이 수직농장과 같은 폐쇄형 식물 생산 시스템에서 재배되는 시금치의 생장과 품질을 향상시킬 수 있음을 시사한다.

Keywords

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