Spectral dependence of electrical energy-based photosynthetic efficiency at single leaf and canopy levels in green- and red-leaf lettuces

Lee, Joon Woo; Kang, Woo Hyun; Park, Kyoung Sub; Son, Jung Eek

doi:10.1007/s13580-017-0154-9

Cited by 14 publications

(16 citation statements)

References 25 publications

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“…These differences were attributed to the facts that lettuce grown under red plus blue LEDs contained higher anthocyanin contents than those grown under red plus blue LEDs supplemented with green light (Figure 3). Similar trends were reported by previous studies [42,43] , demonstrating that the differences of absorption spectrum in green light region was due to anthocyanin contents. Addition of 4.4% green light in red plus blue LEDs increased the reflectance of purple lettuce leaves, and the reflectance in green light region was significantly higher than that in red and blue light region, suggesting that more fraction of visible light passed through upper leaves.…”

Section: Chlorophyll Contents Photosynthesis and Spectral Charactersupporting

confidence: 91%

Growth, nutritional quality, and energy use efficiency in two lettuce cultivars as influenced by white plus red versus red plus blue LEDs

Yan

Niu

et al. 2020

International Journal of Agricultural and Biological Engineering

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Red plus blue light-emitting diodes (LEDs) are commonly applied in plant factories with artificial lighting due to photosynthetic pigments, which absorb strongly in red and blue light regions of the spectrum. However, plants grown under natural environment are used to utilizing broad-wide spectrum by long-term evolution. In order to examine the effects of addition light added in red plus blue LEDs or white LEDs, green and purple leaf lettuces (Lactuca sativa L. cv. Lvdie and Ziya) were hydroponically cultivated for 20 days under white LEDs, white plus red LEDs, red plus blue LEDs, and red plus blue LEDs supplemented with ultraviolet, green or far-red light, respectively. The results indicated that the addition of far-red light in red plus blue LEDs increased leaf fresh and dry weights of green leaf lettuce by 28% and 34%, respectively. Addition of ultraviolet light did not induce any differences in growth and energy use efficiency in both lettuce cultivars, while supplementing green light with red plus blue LEDs reduced the vitamin C content of green leaf lettuce by 44% and anthocyanin content of purple leaf lettuce by 30% compared with red plus blue LEDs, respectively. Spectral absorbencies of purple leaf lettuce grown under red plus blue LEDs supplemented with green light were lower in green light region compared with those grown under red plus blue LEDs, which was associated with anthocyanin contents. White plus red LEDs significantly increased leaf fresh and dry weights of purple leaf lettuce by 25%, and no significant differences were observed in vitamin C and nitrate contents compared with white LEDs. Fresh weight, light and electrical energy use efficiencies of hydroponic green and purple leaf lettuces grown under white plus red LEDs were higher or no significant differences compared with those grown under red plus blue LEDs. In conclusion, white plus red LEDs were suggested to substitute for red plus blue LEDs in hydroponic lettuce (cv. Lvdie and Ziya) production in plant factories with artificial lighting.

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Section: Chlorophyll Contents Photosynthesis and Spectral Charactersupporting

confidence: 91%

Growth, nutritional quality, and energy use efficiency in two lettuce cultivars as influenced by white plus red versus red plus blue LEDs

Yan

Niu

et al. 2020

International Journal of Agricultural and Biological Engineering

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“…Previous studies have primarily focused on seedlings; however, the present study calculated the EY and PY of red leaf lettuce cultivated using different electric light sources in plant factories during the entire growing period (Shibuya and Kozai, 2001;Yokoi et al, 2003). The photosynthesis of red leaf lettuce is usually lower than that of green leaf lettuce (Lee et al, 2017). Additionally, the EY of red leaf lettuce is also lower than that of green leaf lettuce [the research team of the present study used CW to cultivate Boston lettuce with an EY of %80-100 g/kWh (unpublished data)].…”

Section: Discussionmentioning

confidence: 94%

Quantitative Evaluation of Electric Light Recipes for Red Leaf Lettuce Cultivation in Plant Factories

Chung

Chang

et al. 2018

hortte

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Red leaf lettuce (Lactuca sativa) has high nutritional value and is frequently used in salads. In a plant factory with full electric lighting, if the spectrum is incorrect, then red leaf lettuce will have incomplete coloration. This study aimed to establish a light recipe for the mass production of red leaf lettuce using electric light sources in a plant factory by using indicators for quantitative assessment, including energy yield (EY) [grams of fresh weight (FW) harvested per kilowatt hour of electricity input for lighting], photon yield (PY) (grams of FW harvested per mole of photons delivered), anthocyanin yield per kilowatt hour (EYA), and anthocyanin yield per photon (PYA). First, the effects of four types of light quality on FW and anthocyanin content were examined. Then, two types of light quality, light-emitting diode with a red-to-blue photon ratio of 80:20 (R80:B20) and R20:B80, were selected for an experiment involving five treatments. An optimum light recipe (SR5SB1) including R80:B20 treatment during the early stage of cultivation (weeks 1 through 5 after sowing) followed by R20:B80 treatment during the final stage (week 6) was proposed. The SR5SB1 treatment led to FW, EYA, and PYA of 87.8 g/plant, 1.63 mg/kWh, and 0.57 mg·mol–1, respectively. This treatment resulted in the highest EYA and PYA, with 159% and 256% more anthocyanin productivity, respectively, compared with cool white treatment (with FW, EYA, and PYA of 65.8 g/plant, 0.63 mg/kWh, and 0.16 mg·mol–1, respectively). The proposed SR5SB1 light recipe enabled cultivation of red leaf lettuce with a balanced yield and anthocyanin production.

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“…Besides, the pakchoi leaves under L0.9 and L1.8 treatments absorbed more light in these wavelengths, which could result in higher biomass of plant, and the growth of pakchoi under L0.9 was enhanced. The blue light could contribute to anthocyanin accumulated in the leaves [38] , and hydroponic pakchoi leaves under L0.9 and L1.8 treatments showed high absorption of green light might related to the high content of anthocyanin [21,39] .…”

Section: Chlorophyll Contents and Spectral Characteristics Of Hydropo...mentioning

confidence: 99%

Optimal red:blue ratio of full spectrum LEDs for hydroponic pakchoi cultivation in plant factory

Li,

Liu,

et al. 2022

International Journal of Agricultural and Biological Engineering

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Pakchoi, a popular leafy vegetable in China, is expected to be planted in plant factories with artificial lighting (PFALs). In order to examine the effects of different red and blue light ratios (R:B ratio) on growth, photosynthesis, and absorption spectrum of plant leaves, and to analyze the energy use efficiency, the pakchoi (Brassica Chinensis L. cv. Xiazhijiao) was cultivated hydroponically under white LEDs with R:B ratios of 0.9 (L0.9) and 1.8 (L1.8), white plus red LEDs with R:B ratios of 2.7 (L2.7) and 4.0 (L4.0) for 40 d, respectively. The results showed that the leaf length and width were significantly greater in the L0.9 treatment than in other treatments, and the dry weight per plant increased by over 33% when R:B ratio decreased from 4.0 to 0.9. The net photosynthesis rates of pakchoi leaves ranged from 9.2 to 9.6 μmol/(m 2 •s) under different lighting conditions, which had no significant difference. The biggest difference in the spectrum absorptance of pakchoi leaves was expressed in green light waveband, and the highest absorption of plant leaves was under L0.9 and L1.8 treatments. The light energy use efficiency (LUE), photon yield (PY), and energy yield (EY) in L0.9 were over 25% higher than that in the other treatments, while there was no significant difference in the electrical energy use efficiency (EUE). In conclusion, an optimal light quality to cultivate pakchoi in PFALs was the white LEDs with R:B ratio of 0.9, and this finding could provide a promising lighting environment to hydroponic pakchoi yield and energy use efficiency.

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Spectral dependence of electrical energy-based photosynthetic efficiency at single leaf and canopy levels in green- and red-leaf lettuces

Cited by 14 publications

References 25 publications

Growth, nutritional quality, and energy use efficiency in two lettuce cultivars as influenced by white plus red versus red plus blue LEDs

Growth, nutritional quality, and energy use efficiency in two lettuce cultivars as influenced by white plus red versus red plus blue LEDs

Quantitative Evaluation of Electric Light Recipes for Red Leaf Lettuce Cultivation in Plant Factories

Optimal red:blue ratio of full spectrum LEDs for hydroponic pakchoi cultivation in plant factory

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