Effects of temporally shifted irradiation of blue and red LED light on cos lettuce growth and morphology

Jishi, Tomohiro; Kimura, Keisuke; Matsuda, Ryotaro; Fujiwara, Kazuhiro

doi:10.1016/j.scienta.2015.12.005

Cited by 64 publications

(48 citation statements)

References 12 publications

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“…Because there is great potential to reduce costs by designing more efficient lighting systems, many studies have investigated the effects of light intensity and wavelength on plant growth (Hogewoning et al, 2010;Joshi et al, 2017;Li et al, 2013;Li and Kubota, 2009;Lin et al, 2013;Zhang et al, 2015). There has been controversy in the recent literature regarding the effect of alternating red and blue lighting on the growth of lettuce: Kuno et al (2017) showed that alternating irradiation promoted growth compared with simultaneous irradiation of red and blue light at the same DLI and day length at 30 DAS, whereas Jishi et al (2016) showed no significant difference between the two conditions at 21 DAS. It is highly possible that differences in cultivation stage could explain this difference.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, Shimokawa et al (2014) and Chen et al (2017) reported that alternating red and blue light could affect growth of lettuce, but the authors could not conclude whether it had benefit for plant growth compared with simultaneous red and blue light because the growth period was short or the daily light integral (DLI) and day length were not comparable among treatments. Recently, Kuno et al (2017) showed that alternating red and blue light could enhance growth in leafy lettuce compared with simultaneous red and blue light under equal DLI and day length, but Jishi et al (2016) showed the opposite result in cos lettuce. Thus, the effect of alternating red and blue light on plant growth and the underlying mechanisms remain to be clarified.…”

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confidence: 99%

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Continuous Irradiation with Alternating Red and Blue Light Enhances Plant Growth While Keeping Nutritional Quality in Lettuce

Ohtake¹,

Ishikura²,

Suzuki³

et al. 2018

horts

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Plant factories with artificial lighting have been developed to improve food production, functional ingredients, and profitability. Intensive research has been performed to elucidate the effects of light intensity and wavelength on plant growth and nutritional quality with the use of light-emitting diodes (LEDs). In particular, the effects of monochromatic red, blue, or simultaneous red + blue light have been studied because these wavelengths are predominantly used for photosynthesis. We examined the effects of alternating red and blue light provided by LEDs over a period of 24 hours on the growth and nutritional properties of leafy lettuce. The results clearly show that alternating red and blue light accelerated plant growth significantly compared with white fluorescent lamps or red and blue LEDs at the same daily light integral. Plants grown under alternating red/blue light had a greater net assimilation rate and total and projected leaf area (an indicator of the fraction of leaf area that absorbs more light) than other plants. Additionally, alternating red and blue light maintained high concentrations of sugars, ascorbic acid, and anthocyanins in leaves. Taken together, the results indicate that continuous irradiation with alternating red and blue light could enhance growth while maintaining the nutritional quality in lettuce.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Continuous Irradiation with Alternating Red and Blue Light Enhances Plant Growth While Keeping Nutritional Quality in Lettuce

Ohtake¹,

Ishikura²,

Suzuki³

et al. 2018

horts

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show abstract

“…Generally, it is expected that a higher light intensity would result in a higher biomass accumulation [35]. An increment in the dry leaves' biomass has been observed in lettuce grown under 220 µmol m −2 s −1 PPFD [33].…”

Section: Effect Of Different Growing Conditions On Biomass Accumulatimentioning

confidence: 99%

Optimization of LED Lighting and Quality Evaluation of Romaine Lettuce Grown in An Innovative Indoor Cultivation System

Loconsole

Cocetta

Santoro³

et al. 2019

Sustainability

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Sustainability is the most critical point in micro-scale indoor crop systems. It can be improved through the optimization of all of the production factors, such as water, nutrients, and energy. The use of light-emitting diodes (LED) allows the fine regulation of the light intensity and light spectrum to be obtained, with a significant reduction in energy consumption. The objective of this study was the optimization of a LED-based protocol of light management for Romaine lettuce cultivation in a micro-growing environment specifically designed for home cultivation. Four different growing cycles were tested. In each one, the light spectrum was modified by increasing the percentage of red light and decreasing the blue light. This resulted in a change in the light intensity which ranged from 63.2 to 194.54 µmol m −2 s −1 . Moreover, the photoperiod was shortened to reduce the energy consumption and, in the last cycle, the effect of the daily alternation of dark and light was tested. The fresh and dry biomass produced were measured and the energy consumed in each cycle was monitored. The quality of lettuce was evaluated by measuring several physiological indexes, including chlorophyll a fluorescence, chlorophyll, sugars, nitrate, lipid peroxidation, carotenoids, and phenolic index. The results obtained showed that the productivity and the quality of lettuce can be positively affected by modulating the light quality and intensity, as well as other cultural practices. At the same time, the estimation of the electrical energy consumption indicated that little changes in the lighting recipe can significantly affect the energetic, environmental, and economic impact of home productions.

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“…Usually, the level of the PPFD has to be controlled in order to match with the plants' needs in each growth stage. For example, in the seeding stage, many type of plants require low PPFD such as 50-100 μmol m -2 s -1 (Johkan et al, 2010;Godo et al, 2011;Rabara et al, 2017), and for the vegetative growth stage, the plants require higher PPFD of about 200-400 μmol m -2 s -1 (Jishi et al, 2016;Bantis et al, 2016;Amoozgar et al, 2017;Yao et al, 2017;Chen et al, 2017). The level of PPFD could be controlled by adjusting the intensity of the light sources.…”

Section: Introductionmentioning

confidence: 99%

Effect of three specific spectra of LED light on the growth, yield, and fruit quality of Sida tomato

Watjanatepin¹

2019

Int. j. adv. appl. sci.

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The LED artificial light has been widely applied for greenhouse and indoor plantation. The artificial light generates sole red per blue (R:B) light ratio during plant cultivation from seedling through the fruiting period. The aim of this study is to investigate the fruit quality and the yield of Sida tomatoes under three specific spectra of LED light at different R:B ratios in comparison with the tomato yield and fruit quality under sole R:B light ratio. The experiments were divided into two groups. The 1 st experimental group involved applying the LED light at R25:B75R for the seedling stage, R50:B50 for the vegetative growth, and R75:B25R for the fruit stage. The second experimental group involved applying the LED light at R63:B37 for the seedling, vegetative growth, and fruiting stages. Independent t-test was applied to determine the mean difference of the plant height, stem diameter, fruit yield, fruit weight, fruit size, and TSS. The experimental period was for 115 days. The results confirmed that the three specific spectra of LED light for each growth stage could promote the highest fruit weight, fruit yield, marketable fruit weight, and marketable fruit yield when compared to Sida tomatoes treated with one constant spectrum. Moreover, the level of total soluble sugar is also the highest. Sida tomatoes treated with three specific spectra of LED light has contributed to early and increased fruit yield. This method could be applied to produce high quality tomatoes and yield for the indoor plantation system.

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Effects of temporally shifted irradiation of blue and red LED light on cos lettuce growth and morphology

Cited by 64 publications

References 12 publications

Continuous Irradiation with Alternating Red and Blue Light Enhances Plant Growth While Keeping Nutritional Quality in Lettuce

Continuous Irradiation with Alternating Red and Blue Light Enhances Plant Growth While Keeping Nutritional Quality in Lettuce

Optimization of LED Lighting and Quality Evaluation of Romaine Lettuce Grown in An Innovative Indoor Cultivation System

Effect of three specific spectra of LED light on the growth, yield, and fruit quality of Sida tomato

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