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http://dx.doi.org/10.12791/KSBEC.2013.22.4.392

Effects of Artificial Light Sources on the Photosynthesis, Growth and Phytochemical Contents of Butterhead Lettuce (Lactuca sativa L.) in the Plant Factory  

Kim, Dong Eok (Department of Agricultural Engineering, National Academy of Agricultural Science, RDA)
Lee, Hye Jin (Vegetable Research Division, National Institute of Horticultural and Herbal Sciences, RDA)
Kang, Dong Hyeon (Department of Agricultural Engineering, National Academy of Agricultural Science, RDA)
Lee, Gong In (Department of Agricultural Engineering, National Academy of Agricultural Science, RDA)
Kim, You Ho (Department of Agricultural Engineering, National Academy of Agricultural Science, RDA)
Publication Information
Journal of Bio-Environment Control / v.22, no.4, 2013 , pp. 392-399 More about this Journal
Abstract
This study aimed to investigate responses of photosynthesis, plant growth, and phytochemical contents to different artificial light sources for 'Seneca RZ' and 'Gaugin RZ' two butterhead lettuce (Lactuca sativa L.). In this study, fluorescent lamps (FL), three colors LEDs (red, blue and white, 5 : 4 : 1; RBW) and metalhalide lamps (MH) were used as artificial lighting sources. Photoperiod, air temperature, relative humidity, EC, and pH in a cultivation system were maintained at 16/8 h, $25/15^{\circ}C$, 60~70%, $1.4{\pm}0.2dS{\cdot}m^{-1}$, and $6.0{\pm}0.5$, respectively. The photosynthetic rate of both two butterhead lettuce were the highest under RBW in middle growth stage. However, in late growth stage, the photosynthetic rate of both two butterhead lettuce were higher under RBW and MH than FL. The light sources showed significant results for plant growth but those effects were different to variety. Fresh and dry weight of 'Gaugin RZ' butterhead lettuce under MH were heavier than other lights in all growth stages. Growth of 'Seneca RZ' butterhead lettuce was maximized highest under MH in middle growth stage and FL in late growth stage. In the leaf tissue of 'Seneca RZ' butterhead lettuce, tipburn symptom occurred under all light sources and in the leaf tissue of 'Gaugin RZ' butterhead lettuce, it occurred under two light sources except for fluorescent lamps in late growth stage. kinds of lamp affect plant growth more than plant quality. Relative growth rate of both two butterhead lettuce was faster in middle growth stage than late stage. Growth of 'Gaugin RZ' was shown by kinds of lamp in middle growth stage and but it was not significantly affected by light sources and variety in late stage. Most of the phytochemical contents of two butterhead lettuce were significantly affected by different light sources. Contents of all vitamins showed higher than other light sources on RBW for both two lettuce, especially ${\beta}$-Carotene content of 'Gaugin RZ' was the highest. Plant growth, photosynthesis, and phytochemical contents were observed significant effects by different light sources for two butterhead lettuce but those effects were highly different between variety and kinds of phytochemicals. Therefore, the selection of optimum light source should be considered by variety and kinds of phytochemicals in the plant factory.
Keywords
light intensity; light quality; tipburn; wavelength;
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Times Cited By KSCI : 1  (Citation Analysis)
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