Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
권호 표지

Effects of Red/Blue Light Ratio and Short-term Light Quality Conversion on Growth and Anthocyanin Contents of Baby Leaf Lettuce

적색/청색광의 비율 및 수확 전 광질변환이 어린잎상추의 생육 및 안토시아닌 함량에 미치는 영향

  • Lee, Jun-Gu (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA) ;
  • Oh, Sang-Seok (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA) ;
  • Cha, Seon-Hwa (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA) ;
  • Jang, Yoon-Ah (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA) ;
  • Kim, Seung-Yu (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA) ;
  • Um, Young-Chul (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA) ;
  • Cheong, Seung-Ryong (Vegetable Research Division, National Institute of Horticultural and Herbal Science, RDA)
  • 이준구 (국립원예특작과학원 채소과) ;
  • 오상석 (국립원예특작과학원 채소과) ;
  • 차선화 (국립원예특작과학원 채소과) ;
  • 장윤아 (국립원예특작과학원 채소과) ;
  • 김승유 (국립원예특작과학원 채소과) ;
  • 엄영철 (국립원예특작과학원 채소과) ;
  • 정승룡 (국립원예특작과학원 채소과)
  • Received : 2010.11.09
  • Accepted : 2010.11.30
  • Published : 2010.12.31
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Abstract

To establish the optimum artificial light illumination method for baby leaf lettuce in closed plant factory system, the effects of red/blue light quality and short-term light quality conversion on growth and anthocyanin content were investigated. The growth of 'Hongha' lettuce was most favorable under red single wavelength LED light after 23 days of treatment, sequentially followed by the growth under red/blue mixed light, blue light, and fluorescent light. Total anthocyanin content in the mixed red/blue light (R57-B43) was 4.1-fold and 6.9-fold increased compared to the red LED and fluorescent light, respectively. With increasing the blue light ratio to 43%, the growth of lettuce was significantly decreased, while the relative chlorophyll content and Hunter's $a^*$ value was increased, indicating that the red/blue light ratio inversely affects on growth and anthocyanin pigment development. By changing light quality from red to red/blue mixed light source (R57-B43) for 9 days before harvest, the growth rate decreased compared to the continuous red light illumination, while the anthocyanin content dramatically increased compared to either red LED or fluorescent light. Whereas, when the light source was changed to red light, the growth rate was increased but anthocyanin content was reversely decreased. The result demonstrated that both growth and anthocyanin expression could be effectively regulated by shifting of light quality between red and red/blue mixed light source at a specific growth stage of lettuce in a plant factory.

식물공장 내 생육과 안토시아닌 함량을 동반 제고시킬 수 있는 최적 광조사 방법을 구명하고자 적색광과 청색광의 비율 및 단기간 광질변화 조건을 달리하여 어린잎 상추의 생육 및 안토시아닌 색소발현 양상을 비교 평가하였다. 적색광 단일파장에서 어린잎 상추의 생육이 가장 좋았으며 혼합광, 청색광 및 형광등의 순으로 생육이 억제되었다. 어린잎 상추의 엽내 총 안토시아닌 함량은 청색광과 적색광의 혼합광(R57-B43) 처리에 의해 적색광 단일광원 조건에 비해 4.1배, 형광등(FL) 조건에 비해 6.9배 각각 증가되었다. 청색광의 혼합비율이 43%까지 순차적으로 높아짐에 따라 생육은 억제되었으나 상대 엽록소 함량과 적색도의 발현은 크게 증가하는 경향을 보였다. 수확전 9일간 적색 단일광으로의 광질변환시 생육은 크게 증진된 반면 색소는 급격하게 소실되었으며 반대로 혼합광으로의 광질변환시에는 생육속도는 감소한 대신 안토시아닌 색소함량은 형광등과 적색광에 비해 크게 높아졌다. 따라서 수확 전의 단기간 광질변환 시 적색광의 비율이 높은 광원조건에서 생육을 촉진시킨 후 적색과 청색의 동등 혼합광원으로 변환할 경우 생산성을 유지하면서 고품질의 고색도 상추를 생산할 수 있을 것으로 판단되었다.

Keywords

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