Targeted use of LEDs in improvement of production efficiency through phytochemical enrichment

Taulavuori, Erja; Taulavuori, Kari; Holopainen, Jarmo K.; Julkunen‐Tiitto, Riitta; Acar, Canan; Dinçer, İbrahim

doi:10.1002/jsfa.8492

Cited by 52 publications

(38 citation statements)

References 56 publications

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“…Within the light spectrum, both the blue (400-500 nm) and red (600-700) fractions are known to play a major role on the plant's photosynthetic performance, given that they correspond to the main absorption peaks of chlorophyll a and b [20]. Under mixed red and blue light, while a prevalent red light has been shown to promote plant growth in basil [12], the blue spectral components were reported to foster the biosynthesis of functional compounds [26], with similar responses also observed in lettuce [20,27]. As a result, the adoption of LED lighting featuring red and blue diodes is a common strategy for pursuing enhanced energy use efficiency in indoor lettuce production [19][20][21].…”

Section: Light Emitting Diode (Led) Lighting For Indoor Cultivation Omentioning

confidence: 99%

Modelling Environmental Burdens of Indoor-Grown Vegetables and Herbs as Affected by Red and Blue LED Lighting

et al. 2019

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Notwithstanding that indoor farming is claimed to reduce the environmental pressures of food systems, electricity needs are elevated and mainly associated with lighting. To date, however, no studies have quantified the environmental and economic profile of Light Emitting Diodes (LED) lighting in indoor farming systems. The goal of this study is to quantify the effect of varying the red (R) and blue (B) LED spectral components (RB ratios of 0.5, 1, 2, 3 and 4) on the eco-efficiency of indoor production of lettuce, chicory, rocket and sweet basil from a life cycle perspective. The functional unit of the assessment was 1 kg of harvested fresh plant edible product, and the International Reference Life Cycle Data System (ILCD) method was employed for impact assessment. Even though most of the materials of the LED lamp and electronic elements were imported from long distances (14,400 km), electricity consumption was the largest contributor to the environmental impacts (with the LED lamps being the main electricity consumers, approximately 70%), apart from the resources use indicator, where the materials of the lamps and the mineral nutrients were also relevant. RB0.5 was the most energy-efficient light treatment but had the lowest eco-efficiency scores due to the lower crop yields.

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Section: Light Emitting Diode (Led) Lighting For Indoor Cultivation Omentioning

confidence: 99%

Modelling Environmental Burdens of Indoor-Grown Vegetables and Herbs as Affected by Red and Blue LED Lighting

et al. 2019

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“…Light emitting diode (LED) lighting is the predominating source in advanced indoor horticulture systems. The rationale of LEDs in horticultural production is to support sustainable development, reduce carbon footprint and increase resource utilisation efficiency . LED lighting is more efficient compared to the traditional lighting sources used in horticulture and allows the light spectrum and intensity to be tailored to enhance plant performance and the light use efficiency when cultivating high‐value crops .…”

Section: Introductionmentioning

confidence: 99%

“…The rationale of LEDs in horticultural production is to support sustainable development, reduce carbon footprint and increase resource utilisation efficiency. 1,2 LED lighting is more efficient compared to the traditional lighting sources used in horticulture and allows the light spectrum and intensity to be tailored to enhance plant performance and the light use efficiency when cultivating high-value crops. [3][4][5] Light is the sole source of energy for plant photosynthesis and growth; it also serves as a signal regulating plant morphogenesis, physiology and metabolism.…”

Section: Introductionmentioning

confidence: 99%

Lighting intensity and photoperiod serves tailoring nitrate assimilation indices in red and green baby leaf lettuce

et al. 2019

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BACKGROUND Understanding plant responses to light quantity in indoor horticultural systems is important for optimising lettuce growth and metabolism as well as energy utilisation efficiency. Light intensity and photoperiod sufficient for normal plant growth parameters might be not efficient for nitrate assimilation. Therefore, this study explored and compared the effects of different light intensities (100–500 μmol m−2 s−1) and photoperiods (12–24 h) on the growth and nitrate assimilation in red and green leaf lettuce (Lactuca sativa L.). RESULTS For efficient nitrate assimilation, 300–400 μmol m−2 s−1 photosynthetic photon flux density (PPFD) and 16–18 h photoperiod is necessary for red and green lettuces. The insufficient light quantity resulted in reduced growth and remarkable increase in nitrate and nitrite contents in both cultivars. Short photoperiods, similarly to low PPFD, growth parameters, chlorophyll indices and nitrate assimilation indices showed the shortage of photosynthetic products for normal plant physiological processes. Short photoperiods had the least pronounced effect on nitrate and nitrite contents in lettuce leaves. CONCLUSION Light intensity was superior compared to photoperiods for efficient nitrate assimilation in both lettuce cultivars. Under short photoperiods, similarly to low intensity, growth parameters, chlorophyll index and nitrate assimilation indices showed a shortage of photosynthetic products for normal physiological processes. The free amino acid concentration increased, but it was not efficiently incorporated in proteins, as their level in lettuce was lower compared to those for moderate photoperiods. © 2019 Society of Chemical Industry

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“…Therefore, the parameters of LEDs are considered to affect the growth and photosynthesis of plants, and also the yield and quality of them [9][10][11][12]. Thus, the optimal vegetable production can be achieved by adjusting the parameters of LED light quality, light intensity, and photoperiod [13][14][15]. However, as a popular vegetable, the suitable LED light parameters for spinach have not been fully investigated.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Artificial Light for Spinach Growth in Plant Factory Based on Orthogonal Test

Zou

Huang

et al. 2020

Plants

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Artificial LED source provides the possibility to regulate the lighting environment in plant factorys that use limited space to plant, aiming at high throughput and good quality. However, different parameters of light intensity, quality, and photoperiod will influence the growth and accumulation of bio-compounds in plants. In order to find the optimal setting of LED light for spinach planting, four group experiments were designed using the orthogonal testing method. According to the experimental results, for growth indexes including fresh weight, dry weight, root length and so on, photoperiod is the most influential factor, light intensity is the second, and light quality is the least. The best light mode (R:B = 4:1, photosynthetic photon flux density (PPFD) = 100 μmol∙m−2∙s−1 and 13/11 h) among all eight possible combinations in the range was also determined. Furthermore, for quality indexes, including the soluble sugar content, protein content and so on, a new scoring method was introduced to make a comprehensive score for evaluating. Then, the light combination (R:B = 4:1, PPFD = 150 μmol∙m−2∙s−1 and 9/15 h) in the range was found as the optimal scheme for spinach quality under those parameters. As there is trade-off between the optimal light parameters for growth and quality, it is necessary to achieve a balance between yield and quality of the plant during production. If farmers want to harvest spinach with larger leaf area and higher yield, they need to pay attention to the adjustment of the photoperiod and use a lower light intensity and a longer lighting time. If they do not mind the yield of the vegetable but want to improve the taste and nutrition of spinach products, they should pay more attention to the light intensity and use a higher light intensity and a shorter lighting time.

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Targeted use of LEDs in improvement of production efficiency through phytochemical enrichment

Cited by 52 publications

References 56 publications

Modelling Environmental Burdens of Indoor-Grown Vegetables and Herbs as Affected by Red and Blue LED Lighting

Modelling Environmental Burdens of Indoor-Grown Vegetables and Herbs as Affected by Red and Blue LED Lighting

Lighting intensity and photoperiod serves tailoring nitrate assimilation indices in red and green baby leaf lettuce

Optimization of Artificial Light for Spinach Growth in Plant Factory Based on Orthogonal Test

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