Effect of Various LED Light Qualities, Including Wide Red Spectrum-LED, on the Growth and Quality of Mini Red Romaine Lettuce (cv. Breen)

Lee, Joo Hwan; Kwon, Yong Beom; Roh, Yoo Han; Choi, In-Lee; Kim, Jidong; Kim, Yong-Duk; Yoon, Hyuk; Kang, Ho-Min

doi:10.3390/plants12102056

Cited by 8 publications

(7 citation statements)

References 58 publications

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“…It was shown previously that red amaranth treated with blue light compared to dark conditions, had increased levels of betalains due to the upregulation of key genes involved in the synthesis of betalains by blue light ( 56 ). Similarly, the increase in the proportion of blue light led to significantly higher levels of anthocyanins in red lettuce, which is consistent with the previous light studies on red lettuce ( 46 , 57 ). This is likely to be related to blue light activating the expression of genes that induce anthocyanin biosynthesis ( 57 ).…”

Section: Discussionsupporting

confidence: 91%

Light manipulation as a route to enhancement of antioxidant properties in red amaranth and red lettuce

Bucky,

Pičmanová,

Porley

et al. 2024

Front. Nutr.

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With the growing global population and climate change, achieving food security is a pressing challenge. Vertical farming has the potential to support local food production and security. As a Total Controlled Environment Agriculture (TCEA) system, vertical farming employs LED lighting which offers opportunities to modulate light spectrum and intensity, and thus can be used to influence plant growth and phytochemical composition, including antioxidants beneficial for human health. In this study, we investigated the effect of four red-to-blue light ratios of LEDs (R:B 1, 2.5, 5 and 9) on the growth and antioxidant components in red amaranth microgreens and red lettuce. Plant growth, total phenols, betalains, anthocyanins, vitamin C and antioxidant capacity (ferric reducing antioxidant power assay) were evaluated. A higher proportion of red light resulted in biometric responses, i.e., stem elongation in red amaranth and longer leaves in red lettuce, while the increase in the blue light fraction led to the upregulation of antioxidative components, especially total phenols, betalains (in red amaranth) and anthocyanins (in red lettuce). The antioxidant capacity of both crops was strongly positively correlated with the levels of these phytochemicals. Optimizing the red-to-blue ratio in LED lighting could be effective in promoting antioxidant-rich crops with potential health benefits for consumers.

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Section: Discussionsupporting

confidence: 91%

Light manipulation as a route to enhancement of antioxidant properties in red amaranth and red lettuce

Bucky,

Pičmanová,

Porley

et al. 2024

Front. Nutr.

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“…All spectral qualities had no significant effect on leaf layer 1 of the first row. This was the same trend as that found in the results of Shimizu, H. and Lee et al [ 59 , 60 ], which provide a basis for the results of the longest leaf length and the largest number of leaves found in lettuce grown under red light alone. Supplemental upward lighting of red retarded senescence and reduced waste, improving the marketable shoot biomass effectively, as red is most efficiently absorbed by chlorophyll [ 7 , 8 ].…”

Section: Discussionsupporting

confidence: 88%

Side Lighting of Red, Blue and Green Spectral Combinations Altered the Growth, Yield and Quality of Lettuce (Lactuca sativa L. cv. “Yidali”) in Plant Factory

Chen,

Wang,

Liu

et al. 2023

Plants

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A plant factory with artificial lighting (PFAL) usually uses top lighting for cultivation. The light from the upper part of the canopy cannot penetrate the entire lettuce canopy, however, resulting in uneven vertical spatial light in the canopy, and accelerating the senescence of both the bottom and side leaves of the plant canopy. Therefore, in this study, the performance of lettuce in hydroponics was investigated upon supplemental side lighting with different spectral LEDs in a PFAL. A set of short-term side lighting treatments, including no side lamps (CK), red (R), blue (B), red + blue (RB), and red + blue + green (RGB) LED lamps (150 μmol·m−2·s−1, respectively), was employed for an additional 2 h per day after normal top lighting for 6 days before harvest. The results showed that the lettuce canopy was relatively loose and had a large crown size under side lighting compared with CK. Side lighting, irrespective of spectral qualities, significantly increased the fresh weight, and the R, B, RB, and RGB treatments increased the shoot fresh weight of lettuce plants by 34%, 19%, 31%, and 34%, and increased the fresh weight of leaf layer 2 by 50%, 17%, 44%, and 48%, respectively. The side lighting of different spectral qualities had a significant impact on the nutritional quality of the first row of lettuce at the edge of the top lighting illuminated area. Treatment B significantly promoted the chlorophyll content of leaf layer 3; the soluble sugar contents from leaf layer 1, 2, and 3; the starch contents in leaf layers 2 and 3; and the content of phenolics in the leaf layers 3; and significantly reduced the nitrate content in leaf layers 2 and 3. RGB significantly increased soluble sugar content by 91%, and the starch content in leaf layer 1, as well as the leaf chlorophyll and flavonoid content of leaf layer 3, while R had opposite effect completely. RB significantly increased the leaf chlorophyll content of leaf layer 3 and the nitrate content in leaf layer 1, but the overall effect was lower than that of RGB. In summary, side lighting of any type could effectively improve lettuce yield, solve the problem of inconsistent lettuce plant size caused by the edge effect of top lighting, and affect the nutritional quality of lettuce. B and RGB performed best. There was spatial response diversity of lettuce plants to side lighting spectral qualities.

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“…This trilemma is a global, as well as local and national, issue exacerbated by urban population growth and a declining workforce. To address this trilemma, it is crucial to develop transdisciplinary methodologies based on innovative concepts that significantly enhance food yield and quality while minimizing resource consumption and environmental harm compared to current plant production systems [ 1 , 2 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of different light intensity on the growth of tomato seedlings in a plant factory

Zheng,

Zou,

Lin

et al. 2023

PLoS ONE

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Light-emitting diodes (LEDs) were the best artificial light source for plant factories. Red light-emitting diodes (LEDs, R) and blue light-emitting diodes (LEDs, B) were used to obtain different light intensities of uniform spectra, and the greenhouse environment was considered as a comparison. The results showed that root dry weight, shoot dry weight and stem diameter were superior in plant growth under 240 μmolm-2s-1, additionally, the Dixon Quality Index (DQI) was also best. Under 240 μmolm-2s-1, the net photosynthesis rate (Pn) was consistent with the greenhouse’s treatment, superior to other experimental groups. The results implied that the PPFD was more suitable for the cultivation of tomato seedlings under the condition of 240 μmolm-2s-1, and can replace the greenhouse conditions so as to save energy and reduce emissions.

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Effect of Various LED Light Qualities, Including Wide Red Spectrum-LED, on the Growth and Quality of Mini Red Romaine Lettuce (cv. Breen)

Cited by 8 publications

References 58 publications

Light manipulation as a route to enhancement of antioxidant properties in red amaranth and red lettuce

Light manipulation as a route to enhancement of antioxidant properties in red amaranth and red lettuce

Side Lighting of Red, Blue and Green Spectral Combinations Altered the Growth, Yield and Quality of Lettuce (Lactuca sativa L. cv. “Yidali”) in Plant Factory

Effects of different light intensity on the growth of tomato seedlings in a plant factory

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