LED異質波段夜間補光於紅捲鬚萵苣生長品質影響之研究

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LED異質波段夜間補光於紅捲鬚萵苣生長品質影響之研究

Effect of supplemental LED lighting with different narrowband wavelengths during night on the growth of Lollo Rosso lettuce

張光璧 , Masters　　Advisor：張仲良　　

繁體中文

水耕栽培；發光二極體；紅捲鬚萵苣；花青素；色差分析； hydroponics ； light-emitting diodes ； Lollo Rosso lettuce ； anthocyanin ； leaf color analysis

Abstract │ Reference (61) │ Altmetrics

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The Lollo Rosso lettuce(Lactuca sativa) contains high ascorbic acid, total phenol, and anthocyanin. However, the roof covering materials will result in insufficient light and filtering ultraviolet light for lettuce growth in greenhouse and reduce lettuce yield and quality. This study propsed a supplemental LED lighting method using different single narrowband wavelengths to irradiate lettuce at night, respectively. The self-designed hydroponic and environmental control facilities were installed in a greenhouse to meet lettuce growth condition. The experimental site was located on the roof of the Department of Biomechatronics Engineering building, National Pingtung University of Science and Technology (E 120°36'25.038" N 22°38'52.8576). Two experiments were performed and each of them had control group (without supplemental light case), while test group included four monochromatic light irradiation treatments which were, red (655 nm), blue (445 nm), green (525 nm), and ultra UV (380 nm), respectively. The lighting intensity of each monochromatic irradiation was 150μmol．m-2．s-1 except for UV light (20μmol．m-2．s-1). The growth analysis of lettuce included, fresh weight shoot, leaf, stem, and root, leaf number, leaf area, maximum leaf width, average leaf width, maximum leaf length, relative chlorophyll value (SPAD), relative anthocyanin value (ACI), nitrate content, leaf color analysis, and cost-effecitve. The first experiment results demonstrated that the maximum shoot fresh weight was obtained under blue light irradiation treatment. The hightest anthocyanin ACI value was obtained under red light treatment. The second experiment results showed that the use of red light, UV light and without supplemental light irradiation had higher SPAD value in constrast to green light irradiation. Regarding color analysis, blue light treatment got higher green level than green light iridation treatment. As for cost-performance (CP) analysis, the highest CP value was acquired through red light treatment under both experiments. Therefore, the use of red light irridation for lettuce at night was more benefit for lettuce growth and can obtain better leaf fresh weight, content of anthocyanin, and CP ratio in contrast to other treatments.

Reference ( 61 ) 〈TOP〉

[1] R. Llorach, A. Martinez-Sanchez, A. Tomas-Barberan, M. I. Gil, & F. Ferreres, 2008, “ Characterisation of polyphenols and antioxidant properties of five lettuce varieties and escarole,” Food Chemistry, 108(3):1028-1038.
連結：
[2] J. H. Lee, P. Felipe, Y. H. Yang, M. Y. Kim, O. Y. Kwon, D. E. Sok, & M. R. Kim, 2009, “ Effects of dietary supplementation with red-pigmented leafy lettuce (Lactuca sativa) on lipid profiles and antioxidant status in C57BL/6J mice fed a high-fat high-cholesterol diet,” British Journal of Nutrition, 101(08):1246-1254.
連結：
[4] K. Shoji, E. Goto, S. Hashida, F. Goto, & T. Yoshihara, 2010, “ Effect of red light and blue light on the anthocyanin accumulation and expression of anthocyanin biosynthesis genes in red-leaf lettuce,” Journal of Science and High Technology in Agriculture, 22(2)：107-113.
連結：
[5] M. Johkan, K. Shoji, F. Goto, S. N. Hahida, & T. Yoshihara, 2012, “ Effect of green light wavelength and intensity on photomorphogenesis and photosynthesis in Lactuca sativa,” Environmental and Experimental Botany, 75：128-133.
連結：
[6] J. Burger, & G. E. Edwards, 1996, “ Photosynthetic efficiency, and photodamage by UV and visible radiation, in red versus green leaf coleus varieties,” Plant Cell Physiol, 37(3)：395-399.
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