Effect of Artificial Light Sources on Growth and Quality Characteristics of Leaf Lettuce in Closed Plant Factory System

Choi, Chang Kyoung; Lee, Jun Gu; Jang, Yoon Ah; Kim, Tae Hyun; Oh, Sang Seok; Lee, Hye Jin; Um, Yeong Cheol

doi:10.14397/jals.2013.47.6.23

Cited by 10 publications

(3 citation statements)

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“…Lee et al (2010) reported that chlorophyll content can be controlled by adjusting the LED light quality in lettuce [ 9 ]. A report also shows that the chlorophyll content in lettuce increases with blue light treatment [ 23 ]. However, in our study, LED-blue light showed a lower chlorophyll content than FL.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Growth Characteristics and Biological Activities of ‘Dachul’, a Hybrid Medicinal Plant of Atractylodes macrocephala × Atractylodes japonica, under Different Artificial Light Sources

Hwang

Seo

Park

et al. 2022

Plants

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This study was conducted to evaluate the effects of different artificial light sources on the growth characteristics and various biological activities of the Atractylodes macrocephala x Atractylodes japonica hybrid cv. ‘Dachul’, which is highly useful for medicinal purposes. The plant had the largest biomass with a plant height of 38.20 ± 1.95 cm when treated with microwave electrodeless light (MEL). The chlorophyll content of the plants treated with fluorescent light (FL) was 53.93 ± 1.05 SPAD and was the highest. The antioxidant effect, determined using 2,2-diphenyl-1-picrylhydrazyl (DPPH), was the highest with 92.7 ± 0.2% in plants treated with light-emitting diode (LED)-green light. Total phenol and flavonoid contents were significantly higher with 19.7 ± 0.5 mg GAE/g and 40.2 ± 2.2 mg QE/g in the sample treated with LED-green light, respectively. For antimicrobial activity using the minimum inhibitory concentration (MIC) technique, the inhibitory ability against Escherichia coli was at 0.25 mg/mL under LED-green light treatment. The whitening activity using tyrosinase enzyme showed the highest tyrosinase inhibitory ability at 62.1 ± 1.2% of the above extract treated with MEL light. To confirm the immune activity in lipopolysaccharide (LPS)-induced RAW 264.7 cells, NO production of inflammation-related substances was measured. In addition, the inflammation-related genes iNOS (inducible nitric oxide synthase), COX-2 (cyclooxygenase-2), and TNF-α (tumor necrosis factor-α) in the same sample were confirmed using reverse transcriptase (RT)-PCR, and the result showed that gene expression was suppressed compared with that in the control group. It is expected that Dachul plants treated with LED-blue light will play an important role in enhancing intracellular anti-inflammatory activity. From these results, the effect for various biological activities appeared in a significantly diverse spectrum in response to different wavelengths of artificial light sources in Dachul.

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Section: Resultsmentioning

confidence: 99%

Evaluation of Growth Characteristics and Biological Activities of ‘Dachul’, a Hybrid Medicinal Plant of Atractylodes macrocephala × Atractylodes japonica, under Different Artificial Light Sources

Hwang

Seo

Park

et al. 2022

Plants

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“…Notably, LEDs are used to improve the quality of plants by varying the SPD because it is easy to control their light quality (Choi et al, 2013). Accordingly, general households as well as plant factories and closed nursery facilities are increasingly using LEDs rather than fluorescent lamps (Matsushima et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Growth, Flowering, and Chlorophyll Fluorescence Responses of <italic>Viola cornuta</italic> cv. Penny Red Wing according to Spectral Power Distributions

Jang,

Lee,

Shin

et al. 2023

J. People Plants Environ

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Background and objective: The genus Viola, a member of the Violaceae family, is renowned for its ornamental flower crops. Additionally, Viola species are relatively pest-resistant and easy to manage. They are widely used in gardens, and some of their flowers are even edible. In this study, our focus was on V. cornuta cv. Penny Red Wing (hereinafter referred to as ‘Penny Red Wing’), an experimental plant chosen for its high ornamental value and rapid growth.Methods: We applied a purple light-emitting diode (LED) and three types of white LEDs with varying color temperatures: 3000, 4100, and 6500 K, respectively, as artificial light sources. Notably, a purple LED has a far-red wavelength (700-800 nm) ratio of approximately 17.6% in their spectral power distribution.Results: The findings indicated that several parameters exhibited higher values under purple LED: shoot size parameters, shoot biomass, moisture content of shoots and roots, photochemical reflectance index (PRI), modified chlorophyll absorption ratio index (MCARI), total number of flowers, flower size parameters, scent score, Fv/Fm, and PIABS. However, the 6500 K white LED led to higher evaluations of root length, number of shoots and leaves, root biomass, moisture content of shoots and roots, Fv/Fm, and PIABS. Nevertheless, it was observed that shoot growth was relatively hindered, and the flowering responses were inadequate under the 6500 K white LED, suggesting their unsuitability for the mass production of ‘Penny Red Wing’. Furthermore, the 3000 and 4100 K white LEDs were also deemed unsuitable for cultivating ‘Penny Red Wing’ due to their lower cultivation efficiency.Conclusion: ‘Penny Red Wing’ was evaluated as having superior growth, flowering, and chlorophyll fluorescence responses under purple LED, indicating that the far-red wavelength had a more pronounced effect compared to the green wavelength (500-600 nm). Therefore, we recommend cultivating this cultivar under purple LED, which include the far-red wavelength.

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“…However, LEDs (light-emitting diodes) are widely used as light sources in closed-type plant factories because of their lower heat emission, longer operating lifespan, Horticulturae 2022, 8, 346 2 of 7 and narrower spectral output [10]. In addition, some researchers have reported that crop growth was higher under LED conditions than in fluorescent conditions [11]. However, these results may differ between environments, plant species, growth conditions, etc.…”

Section: Introductionmentioning

confidence: 99%

Growth Characteristics of Lettuce Relative to Generation Position of Air Anions in a Closed-Type Plant Factory

et al. 2022

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(1) Background: We studied how the generation position of air anions in a closed-type plant factory affects the growth characteristics of lettuce and identified the optimal position. (2) Methods: We used LEDs (red/green/blue = 8:1:1) as a light source and set the temperature and RH of the plant factory to 20 ± 2 ℃ and 50% ± 5%, respectively. We grew lettuce under three air anion conditions—sideward, upward, and downward—and compared the growth characteristics to those of a control grown without air anions. We measured the growth characteristics of the lettuce at 3 and 4 weeks after sowing, and the measurement items were shoot fresh weight (FW) and dry weight (DW); leaf area (LA), length (LL), and width (LW); SPAD; antioxidant capacity; and total phenol content. (3) Results: At 4 weeks, FW in the downward treatment condition was 25.3% higher than in the control, and DW showed a similar difference. LA was about 1943.94 cm²/plant in the downward treatment condition, which was about 15.5% higher than in the control. (4) Conclusions: We conclude that air anion generation has a positive effect on lettuce growth, and the optimal generation position for air anions is downward.

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Effect of Artificial Light Sources on Growth and Quality Characteristics of Leaf Lettuce in Closed Plant Factory System

Cited by 10 publications

References 0 publications

Evaluation of Growth Characteristics and Biological Activities of ‘Dachul’, a Hybrid Medicinal Plant of Atractylodes macrocephala × Atractylodes japonica, under Different Artificial Light Sources

Evaluation of Growth Characteristics and Biological Activities of ‘Dachul’, a Hybrid Medicinal Plant of Atractylodes macrocephala × Atractylodes japonica, under Different Artificial Light Sources

Evaluation of Growth, Flowering, and Chlorophyll Fluorescence Responses of <italic>Viola cornuta</italic> cv. Penny Red Wing according to Spectral Power Distributions

Growth Characteristics of Lettuce Relative to Generation Position of Air Anions in a Closed-Type Plant Factory

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Effect of Artificial Light Sources on Growth and Quality Characteristics of Leaf Lettuce in Closed Plant Factory System

Cited by 10 publications

References 0 publications

Evaluation of Growth Characteristics and Biological Activities of ‘Dachul’, a Hybrid Medicinal Plant of Atractylodes macrocephala × Atractylodes japonica, under Different Artificial Light Sources

Evaluation of Growth Characteristics and Biological Activities of ‘Dachul’, a Hybrid Medicinal Plant of Atractylodes macrocephala × Atractylodes japonica, under Different Artificial Light Sources

Evaluation of Growth, Flowering, and Chlorophyll Fluorescence Responses of &lt;italic&gt;Viola cornuta&lt;/italic&gt; cv. Penny Red Wing according to Spectral Power Distributions

Growth Characteristics of Lettuce Relative to Generation Position of Air Anions in a Closed-Type Plant Factory

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Evaluation of Growth, Flowering, and Chlorophyll Fluorescence Responses of <italic>Viola cornuta</italic> cv. Penny Red Wing according to Spectral Power Distributions