식물공장 내 적색광, 청색광, 적청 혼합광, 자외선, 적외선, 형광등의 광원을 달리하여 어린잎 상추의 생육과 무기성분 흡수를 검토하였다. 잎의 형태는 Red 파장에서 초장 및 하배축의 길이신장이 촉진되어 도장하였고 Far red에서는 생장이 불가능하였으나 Red+Blue의 혼합광원에서는 초장이 짧고 엽수가 많고 생체중이 증가하여 상추의 형태 및 발달 차원에서 유의적으로 좋았다. 광질에 따른 어린잎 상추의 색차 및 상대 엽록소 함량을 조사한 결과, 적색도를 나타내는 Hunter $a^*$ 값은 Red+Blue 혼합광 및 형광등에서 높았고 적색광 및 자외선에서는 낮게 나타났는데 상대 엽록소 함량을 나타내는 SPAD도 같은 경향이었다. 특히 상대엽록소 함량은 형광등의 23.3에 비해 혼합광에서 1.4배 향상된 적색도를 나타내었다. 광원별 상추의 무기물 함량을 조사한 결과, pH 및 K 함량은 모든 처리에서 차이가 없었으나 N, Ca, Mg, Fe, Ascorbic acid 함량은 LED 처리구에서 많았고 P 함량은 형광등 처리구에서 많았다. 이상의 결과를 요약하면 단색광에 비하여 Red+Blue 혼합광에서 상추의 생육이 우수하고 무기물 함량이 증대되어 식물공장 내 생산성 향상을 위해서는 혼합광 조절로 상품성 있는 고품질의 상추 생산이 가능 할 것으로 생각되었다.
식물공장 내 적색광, 청색광, 적청 혼합광, 자외선, 적외선, 형광등의 광원을 달리하여 어린잎 상추의 생육과 무기성분 흡수를 검토하였다. 잎의 형태는 Red 파장에서 초장 및 하배축의 길이신장이 촉진되어 도장하였고 Far red에서는 생장이 불가능하였으나 Red+Blue의 혼합광원에서는 초장이 짧고 엽수가 많고 생체중이 증가하여 상추의 형태 및 발달 차원에서 유의적으로 좋았다. 광질에 따른 어린잎 상추의 색차 및 상대 엽록소 함량을 조사한 결과, 적색도를 나타내는 Hunter $a^*$ 값은 Red+Blue 혼합광 및 형광등에서 높았고 적색광 및 자외선에서는 낮게 나타났는데 상대 엽록소 함량을 나타내는 SPAD도 같은 경향이었다. 특히 상대엽록소 함량은 형광등의 23.3에 비해 혼합광에서 1.4배 향상된 적색도를 나타내었다. 광원별 상추의 무기물 함량을 조사한 결과, pH 및 K 함량은 모든 처리에서 차이가 없었으나 N, Ca, Mg, Fe, Ascorbic acid 함량은 LED 처리구에서 많았고 P 함량은 형광등 처리구에서 많았다. 이상의 결과를 요약하면 단색광에 비하여 Red+Blue 혼합광에서 상추의 생육이 우수하고 무기물 함량이 증대되어 식물공장 내 생산성 향상을 위해서는 혼합광 조절로 상품성 있는 고품질의 상추 생산이 가능 할 것으로 생각되었다.
The objective of this study was to elucidate the effect of light-emitting diode treatment on early growth and inorganic elements in leaf lettuce (Lactuca sativa L. 'Oak Leaf'). In changes to leaf morphology, shoot elongation and hypocotyl length showed poor growth under red light irradiation, while ...
The objective of this study was to elucidate the effect of light-emitting diode treatment on early growth and inorganic elements in leaf lettuce (Lactuca sativa L. 'Oak Leaf'). In changes to leaf morphology, shoot elongation and hypocotyl length showed poor growth under red light irradiation, while red+blue light irradiation induced shorter plant height and more leaves, resulting in increased fresh weight. With respect to Hunter's color and SPAD values, lettuce seedlings grown under red+ blue and fluorescent light irradiation had a higher $a^*$ value but showed no other changes to SPAD values. Interestingly, redness in relative chlorophyll content was 1.4 times higher under red+blue light irradiation. Inorganic element (N, Ca, Mg, and Fe) and ascorbic acid concentrations increased in lettuce plants grown under LED light irradiation compared to those of lettuce grown under fluorescent light, which showed a higher P content. In conclusion, red+blue light irradiation, which stimulates growth and higher nutrient uptake in leaf lettuce, could be employed in containers equipped with LEDs.
The objective of this study was to elucidate the effect of light-emitting diode treatment on early growth and inorganic elements in leaf lettuce (Lactuca sativa L. 'Oak Leaf'). In changes to leaf morphology, shoot elongation and hypocotyl length showed poor growth under red light irradiation, while red+blue light irradiation induced shorter plant height and more leaves, resulting in increased fresh weight. With respect to Hunter's color and SPAD values, lettuce seedlings grown under red+ blue and fluorescent light irradiation had a higher $a^*$ value but showed no other changes to SPAD values. Interestingly, redness in relative chlorophyll content was 1.4 times higher under red+blue light irradiation. Inorganic element (N, Ca, Mg, and Fe) and ascorbic acid concentrations increased in lettuce plants grown under LED light irradiation compared to those of lettuce grown under fluorescent light, which showed a higher P content. In conclusion, red+blue light irradiation, which stimulates growth and higher nutrient uptake in leaf lettuce, could be employed in containers equipped with LEDs.
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문제 정의
Despite the increasing popularity of red LEDs as a radiation source for growing plants, information is available for only a few plant species that directly compares growth and yield under red LEDs (with and without supplemental blue light) with those under the broad spectrum light. Hence, the purpose of this study is to evaluate the effects of different LEDs on early seedling growth, leaf color, inorganic elements, ascorbic acid and SPAD value in lettuce.
대상 데이터
1. Absolute PPF spectral distribution balance of LEDs and fluorescent light at the centre of growth areas(The wavelength of each LED used in this study was 450 and 660 nm in red, 450 nm in blue, 450 and 660 nm in red+blue, 350 nm in ultraviolet, and 730 nm in far-red light).
The wavelength of each LED used in this study was 450 and 660 nm in red, 450 nm in blue, 450 and 660 nm in red+blue, 350 nm in ultraviolet, and 730nm in far-red light (Fig. 1).
데이터처리
The collected data were analyzed by using SAS package (version 8.0, SAS Institute Inc., Cary, NC) for Duncan's multiple range tests.
zMeans separation within columns by Duncan,s multiple range test at 5% level.
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