Effects of Irradiation Patterns and Light Quality of Red and Blue Light-Emitting Diodes on Growth of Leaf Lettuce (&lt;I&gt;Lactuca sativa&lt;/I&gt; L.&amp;ldquo;Greenwave&amp;rdquo;)

Kuno, Yoshinori; Shimizu, Hiroshi; Nakashima, Hiroshi; Miyasaka, Juro; Ohdoi, Katsuaki

doi:10.2525/ecb.55.129

Cited by 31 publications

(31 citation statements)

References 17 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%

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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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“…First, PAW was measured in experiment 2 and the result showed that the value was greater in alternation. In a report of Kuno et al (2017), SPAD value in leaf lettuce was not significantly different between plants grown under RB24 and R12B12 conditions. Consequently, the chlorophyll concentration was thought not to have an effect on the difference of PAW between plants grown under alternating irradiation and simultaneous irradiation.…”

Section: Mechanism Of Growth Acceleration By Alternating Irradiationmentioning

confidence: 79%

“…The fresh weight of leaf lettuce grown under alternating irradiation of R and B was greater than that of lettuce grown under simultaneous irradiation with R and B, and white fluorescent lamps (Shimokawa et al, 2014;Ohtake et al, 2015). Furthermore, seedlings of leaf lettuce were grown under four irradiation patterns, consisting of a 12 hours photoperiod (RB 12 h/dark period 12 hours), a 4 hours shifted irradiation of B light (R 4 h/RB 8 h/B 4 h/dark period 8 hours), a 8 hours shifted irradiation of B light (R 8 h/RB 4 h/B 8 h/dark period 4 hours), or an alternating irradiation pattern (R 12 h/B 12 h) (Kuno et al, 2017). The results indicated that the fresh weight of leaf lettuce increased with an increasing shift in irradiation time.…”

Section: Introductionmentioning

confidence: 99%

Photosynthesis and Morphology of Leaf Lettuce (<i>Lactuca sativa</i> L. cv. Greenwave) Grown under Alternating Irradiation of Red and Blue Light

Takasu

Shimizu

Nakashima

et al. 2019

Environ. Control Biol.

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The mechanism for accelerating leaf lettuce growth by alternating irradiation of red (R) and blue (B) lights was investigated in this study. Leaf lettuce was cultivated under nine light conditions with different time ratios of R/B alternate irradiation; R0B24, R3B21, R6B18, R9B15, R12B12, R15B9, R18B6, R21B3 and R24B0. As a result, R21B3 treatment (21 hours of R irradiation and 3 hours of B irradiation, in an alternating pattern without a dark period) was determined to be the optimum condition for leaf lettuce growth, since shoot fresh weight under this treatment was significantly the highest. Moreover, photosynthetic ability and morphology were studied under alternating irradiation (R21B3 and R12B12) and simultaneous irradiation (RB24; simultaneous irradiation of R and B lights without a dark period). Photosynthetic ability of lettuce grown under R21B3 and R12B12 was significantly higher than that under RB24. A morphological index, PA/LA (Projected Area divided by Leaf Area), was greater in R21B3 and R12B12 than in RB24. This result suggested that alternating irradiation causes plants to have an effective posture for receiving light. Therefore, it seems reasonable to conclude that growth acceleration of plants under alternating radiation was caused by high photosynthetic ability and morphological superiority.

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“…For indoor vertical farming, it is imperative to determine the lowest possible light intensity or daily light integral (DLI), with corresponding lowest electricity costs, but with little compromise on yield and quality [5]. Researchers have attempted to manipulate light intensity, photoperiod, light spectrum, lighting direction (downward, sideways, or intra-canopy), and lighting with specific wavelengths delivered at specific timings [6][7][8][9]. In addition, others have tried different combinations of varying wavelengths of LEDs, which can be turned on simultaneously, alternating or with partial overlap of different LEDs [10].…”

Section: Manipulating Light In Indoor Vertical Farmingmentioning

confidence: 99%

Plant Production in Controlled Environments

Niu

Masabni

2018

Horticulturae

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Crop production in open fields is increasingly limited by weather extremes and water shortages, in addition to pests and soil-borne diseases. In order to increase crop yield, quality, and productivity, controlled environment agriculture (CEA) can play an important role as an alternative and supplemental production system to conventional open field production. CEA is any agricultural technology that enables growers to manipulate the growing environment for improved yield and quality. CEA production systems include high tunnels, greenhouses, and indoor vertical farming, as well as hydroponics and aquaponics. Currently, 'low-tech' CEA techniques such as high tunnels (plastic greenhouses with minimum or no cooling and heating) are primarily utilized in developing countries where labor costs are relatively low, and China has by far the largest area covered by high tunnels or 'Chinese-style' solar greenhouses. The most control-intensive 'high-tech' CEA approach, namely indoor vertical farming, has gained tremendous attention in the past decade by researchers and entrepreneurs around the world, owing to advancements in lighting technology, including use of light emitting diodes (LEDs), and increasing urbanization with new market opportunities. This special issue covers some of the CEA topics such as LED lighting, substrate, and hydroponics.

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Effects of Irradiation Patterns and Light Quality of Red and Blue Light-Emitting Diodes on Growth of Leaf Lettuce (<I>Lactuca sativa</I> L.“Greenwave”)

Cited by 31 publications

References 17 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

Photosynthesis and Morphology of Leaf Lettuce (<i>Lactuca sativa</i> L. cv. Greenwave) Grown under Alternating Irradiation of Red and Blue Light

Plant Production in Controlled Environments

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