Usefulness of Broad-Spectrum White LEDs to Envision Future Plant Factory

Nozue, Hatsumi; Gomi, M.

doi:10.1007/978-981-13-1065-2_13

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…F ample, plants exposed to a combination LED light spectrum of red and blue ligh more photoreceptor activation and photosynthetic activity than plants exposed to m chromatic red or blue light [21]. In this context, blue and red lights are thought to b sorbed primarily on the surface of the leaves by the palisade tissue, while green an red lights are penetrated deeply beneath the leaf surface into the foliage [22][23][24]. W served that the addition of green light combined with red, blue, and white spectra Tch (total chlorophyll); Car (carotenoid); SPAD index; GA3 (gibberellic acid content) tuber N. (tuber number); tuber FW.…”

Section: Plant Morphological Characteristicsmentioning

confidence: 99%

Effect of Light Quality on Seed Potato (Solanum tuberose L.) Tuberization When Aeroponically Grown in a Controlled Greenhouse

Rahman,

Islam,

Mumu

et al. 2024

Plants

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A plant factory equipped with artificial lights is a comparatively new concept when growing seed potatoes (Solanum tuberosum L.) for minituber production. The shortage of disease-free potato seed tubers is a key challenge to producing quality potatoes. Quality seed tuber production all year round in a controlled environment under an artificial light condition was the main purpose of this study. The present study was conducted in a plant factory to investigate the effects of distinct spectrum compositions of LEDs on potato tuberization when grown in an aeroponic system. The study was equipped with eight LED light combinations: L1 = red: blue: green (70 + 25 + 5), L2 = red: blue: green (70 + 20 + 10), L3 = red: blue: green (70 + 15 + 15), L4 = red: blue: green (70 + 10 + 20), L5 = red: blue: far-red (70 + 25 + 5), L6 = red: blue: far-red (70 + 20 + 10), L7 = red: blue: far-red (70 + 15 + 15), L8 = red: blue: far-red (70 + 10 + 20), and L9 = natural light with 300 µmol m−2 s−1 of irradiance, 16/8 h day/night, 65% relative humidity, while natural light was used as the control treatment. According to the findings, treatment L4 recorded a higher tuber number (31/plant), tuber size (>3 g); (9.26 ± 3.01), and GA3 content, along with better plant growth characteristics. Moreover, treatment L4 recorded a significantly increased trend in the stem diameter (11.08 ± 0.25), leaf number (25.32 ± 1.2), leaf width (19 ± 0.81), root length (49 ± 2.1), and stolon length (49.62 ± 2.05) compared to the control (L9). However, the L9 treatment showed the best performance in plant fresh weight (67.16 ± 4.06 g) and plant dry weight (4.46 ± 0.08 g). In addition, photosynthetic pigments (Chl a) (0.096 ± 0.00 mg g−1, 0.093 ± 0.00 mg g−1) were found to be the highest in the L1 and L2 treatments, respectively. However, Chl b and TCL recorded the best results in treatment L4. Finally, with consideration of the plant growth and tuber yield performance, treatment L4 was found to have the best spectral composition to grow quality seed potato tubers.

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Section: Plant Morphological Characteristicsmentioning

confidence: 99%

Effect of Light Quality on Seed Potato (Solanum tuberose L.) Tuberization When Aeroponically Grown in a Controlled Greenhouse

Rahman,

Islam,

Mumu

et al. 2024

Plants

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“…LEDs with different spectral outputs in various combinations (red, blue, and green) have frequently been used to study plant responses, with the aim of identifying the most effective spectral quality combination that can produce the desired effect on plants [20]. However, white LED light is commonly used for the indoor cultivation of leafy vegetables, including microgreens, because of its broad-spectrum features that are beneficial to plant growth [21]. Therefore, in the current study, instead of combining spectral bands of light, we supplemented a traditional white light with a red or blue tone.…”

Section: Introductionmentioning

confidence: 99%

LED Light Quality Affected Bioactive Compounds, Antioxidant Potential, and Nutritional Value of Red and White Cabbage Microgreens

et al. 2023

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Microgreens are environmentally friendly and have health benefits in addition to their basic nutritional contents. The effect of white (W), white–blue (W + B), and white–red (W + R) light on the bioactive compounds, nutrient composition, and antioxidant potential of red and white cabbage microgreens were investigated using light-emitting diodes (LEDs). The results showed that protein, fat, ash, chlorophylls, and carotenoids were the highest in microgreens under W light, while phenolic compounds were highest in microgreens under W + B light. Supplementation with white light, as well as red or blue light, resulted in higher levels of sugars and total fiber in both white and red microgreens. Twenty-six and thirty-three phenolic compounds were identified in white and red cabbage microgreens, respectively. The identified phenolics belonged to three classes, including phenolic acids, flavonols, and anthocyanins. The antioxidant potential of both cabbage microgreens was determined by four methods (ABTS, DPPH, ORAC, and FRAP). It was found that the highest antioxidant potential was observed in microgreens grown under the W + B light combination. On the other hand, the W + R light combination increased the content of β-sitosterol and campesterol. The results may be helpful in the selection of the type of LED lighting that determines the high nutritional and health-promoting potential of white and red cabbage microgreens.

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“…Examples of simple LED grow lights are fixtures populated entirely with white broadband or only blue and red LED chips. For versatility, albeit more costly, the fixture can consist of a mix of broad-and narrowband LEDs to enable customizable spectra (Nozue and Gomi, 2018). For grow-light recipes, using single color LEDs, the basic design is blue (400-500 nm) combined with red (600-700 nm) light (resulting in magenta) because blue and red are the main wavelength bands in the photosynthetically active radiation spectrum (PAR, 400-700 nm) and crucial to proper plant growth and development.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Blue spectral quality contributes to yield and ascorbic acid content in ‘Micro Tom’ tomato under sole-source lighting

Goldman,

Kolmos

2023

Preprint

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There is an intricate relationship between the spectral composition of light, plant photosynthetic performance and biomass accumulation. The interaction between plants and the ambient light environment is not only crop-specific but also crucial for maximized yield and nutritional quality. The emergence of LED technology introduced a unique avenue for manipulating the light spectrum, offering new and continued possibilities for optimizing growth conditions. With a focus on tomato cultivation under sole-source lighting, we have investigated the impact of blue spectral quality (waveband composition) on growth and nutritional value of dwarf tomato. Notably, our study revealed that distinct wavebands of blue light (400 nm, 420 nm and 450 nm) can influence the net photosynthetic rate despite unaltered photochemical efficiency. Our research uncovered a correlation whereby shorter wavelengths of blue light increased leaf area, while longer blue wavelengths contributed to greater harvest indices. In addition, we identified a specific blue peak wavelength, 450 nm, that significantly affected chlorophyll composition in leaves and ascorbate levels in fruits. Through these findings, we call attention to the notion that blue spectral quality has a role in shaping both yield and nutritional attributes of dwarf tomato, such as ‘Micro Tom’, under sole-source lighting. Overall, our research provides valuable insight into the nuanced interplay between light spectrum, plant physiology, and horticultural outcome.

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Usefulness of Broad-Spectrum White LEDs to Envision Future Plant Factory

Cited by 8 publications

References 17 publications

Effect of Light Quality on Seed Potato (Solanum tuberose L.) Tuberization When Aeroponically Grown in a Controlled Greenhouse

Effect of Light Quality on Seed Potato (Solanum tuberose L.) Tuberization When Aeroponically Grown in a Controlled Greenhouse

LED Light Quality Affected Bioactive Compounds, Antioxidant Potential, and Nutritional Value of Red and White Cabbage Microgreens

Blue spectral quality contributes to yield and ascorbic acid content in ‘Micro Tom’ tomato under sole-source lighting

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