Academic Research Perspective of LEDs for the Horticulture Industry

Mitchell, Cary A.

doi:10.21273/hortsci.50.9.1293

Cited by 25 publications

(17 citation statements)

References 49 publications

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“…Also Zhang et al (2015), working with lettuce under conditions of commercial plant factory (200 μmol m -2 s -1 PPF above the canopy and supplementation of basal light at 40 μmol m -2 s -1 ), reported that W LEDs were the most suitable for plant growth, being possible to increase the tradable fresh weight and plant quality. This supports the idea that W LEDs can efficiently replace the traditional florescent tubes for plant growth on controlled environment and confirms Mitchell's (2015) thought, when he refers that after a quarter century of testing and development we are in fact rediscovering the value of white light.…”

Section: Discussionsupporting

confidence: 69%

“…chinensis (Li, Tang, Xu, Liu & Han, 2012), Valerianella locusta (Wojciechowska, Kołton, Długosz-Grochowska, Żupnik & Grzesiak, 2013). However, as stated by Mitchell (2015), growing plants under red light and then conclude that adding a little blue light makes them grow even better, is not surprising. In fact, if a little green light is added along with red and blue, plant species with some mutual leaf shading grow even better (Kim et al, 2004;Lu et al, 2012).…”

Section: Introductionmentioning

confidence: 96%

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Analysis of Growth Parameters for Crop Vegetables under Broad and Narrow LED Spectra and Fluorescent Light Tubes at Different PPFs

Peixe¹,

Ribeiro²,

Ribeiro³

et al. 2018

JPS

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Several physiological and yield parameters were evaluated in lettuce plants, cv. ‘Trocadero’, while growing at four different photosynthetic photon flux (PPF) (70, 120, 250 and 400 ± 10 µmol m-2 s-1), under four light spectra, white (W), red (R) and blue (B) Light-Emitting Diode (LED) lamps and cool white fluorescent tubes (FL). Yield parameters were also evaluated on spinach, turnip and radish, growing under identical light spectra but using a single PPF (340 ± 10 µmol m-2 s-1). Lettuce development was impaired at PPFs below 250 µmol m-2 s-1 for all tested spectra. At higher PPFs (250 and 400 ± 10 µmol m-2 s-1), for the two broad spectra tested (W LEDs and FL light), no significant differences were registered on all physiological and yield parameters evaluated. On all situations W LEDs performed, at least, as good as the FL light, indicating that actual W LEDs can efficiently replace traditional light sources, with all the inherent benefits, which include significant lower power consumption. For all species, narrow light spectra (R and B LEDs) proved not being able to provide normal plant development. Plants under R LEDs, although presenting, in some situations, a fresh weight higher than those achieved with the broad light spectra, always led to abnormal plant morphology, characterized by expanded petioles and leaf curling. B LEDs, in spite of promoting plant growth with normal morphology, frequently led to a lower number of leaves and consequently to a lower fresh weight.

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Section: Discussionsupporting

confidence: 69%

Section: Introductionmentioning

confidence: 96%

Analysis of Growth Parameters for Crop Vegetables under Broad and Narrow LED Spectra and Fluorescent Light Tubes at Different PPFs

Peixe¹,

Ribeiro²,

Ribeiro³

et al. 2018

JPS

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“…Additionally, the ratio of red to far red, affecting the phytochrome-mediated responses should be taken into account as well [23] . A thorough understanding of those interactions is essential for construction of light sources optimal for cereal plant growth and development [14,24] . Obtained results do not discredit LEDs as light sources in greenhouses dedicated for cereal breeding.…”

Section: Resultsmentioning

confidence: 99%

“…It was found that the use of blue light (obtained from fluorescent lamps, as blue LEDs have not yet been commercially produced that time), and red in the ratio of 1 : 9 enabled to obtain wheat yields comparable to those obtained using fluorescent lamps [11] . Although the scientific literature concerning photo-morphogenesis is rich [12] , there is no systematic knowledge on methods of cultivation of cereal crops under the LED panels [13,14] . The main goal of our preliminary studies was determination of effects of different types of light sources on cereal seedlings growth.…”

Section: Introduction mentioning

confidence: 99%

Usefulness of LED lightings in cereal breeding on example of wheat, barley and oat seedlings

Stefański¹,

Siedlarz

Matysik³

et al. 2019

International Journal of Agricultural and Biological Engineering

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The LED lightings in horticulture are becoming prevalent, due to their physical properties allowing reduction of electricity consumption and on modulation of light spectrum and frequency. At present, LED lightings are not widely used by cereal breeding companies despite the fact that use of greenhouses is very common. This is why, the present experiment was run to show the evidence of LED lightings usefulness in a cereal crops breeding processes. Spring wheat (Triticum aestivum, L.), spring barley (Hordeum vulgare, L.) and oat (Avena sativa, L.), one cultivar of each species, were used for the 9 week trial conducted in a greenhouse with strictly controlled temperature (22 o C) and humidity (80%). As a light source, 4 LED illuminators along with a high-pressure sodium and xenon lamps and a natural sunlight in non-shadowed area of the same greenhouse were used. LED illuminators were characterized by relatively high ratio of blue/red radiation (0.6-1.3) to force the stem shortening, since cereal seedlings with such a growth habit are preferred in greenhouse cultivation of cereals. It was evidenced, that LED illuminators provided light suitable for cereals growth in a greenhouse, however each species had slightly different optimal light requirements. For wheat and barley the best impact on stem shortening and also on time to heading had a LED illuminator with high multi wave-blue radiation whereas on the leaves width the illuminator with lowest blue/red ratio. For oat seedlings a light source with highest light intensity and highest blue/red ratio seemed to be the most proper. Not much differences in seedlings growth and time to heading suggested that there is a chance for construction of one universal type of LED illuminator designed for greenhouse stages of cereal crops breeding.

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“…Using those understandings about plant responses to light quality, artificial lighting is widely used in research and commercial production to supplement or replace sunlight for better control of the physiological responses that are being researched or for better productivity and product quality [6,[13][14][15][16]. However, the distinct light qualities of artificial lighting often produce undesirable responses in plants.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Spectral Perception of Plants with Light Absorption of Photoreceptors

Kang

Kim

Yoon

et al. 2020

Plants

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Although plant responses to artificial lighting spectra often produce abnormal morphogenesis and reduced productivity, no quantification method to determine how plants perceive and respond to light has been available. Our objective in this study was to test whether a plant’s spectral perception can be quantified using the light absorption of its major photoreceptors, phytochrome, cryptochrome, and phototropin. We developed an artificial solar lamp and three different light sources, based on a high-pressure sodium lamp, a fluorescent lamp, and red and blue light-emitting diodes, whose absorption by photoreceptors was equal to that of the standard solar spectrum. Cucumber plants grown under the artificial solar and developed light sources showed normal photomorphogenesis and were indistinguishable from each other. Plants grown under unmodified commercial light sources had abnormal photomorphogenesis that made them short and small. The photosynthetic rate was higher under the unmodified light sources; however, dry masses were highest under the artificial solar and modified light sources, indicating that the cucumber plants are optimized to the solar spectrum. Our results clearly demonstrate that the spectral perceptions of plants can be quantified using the light absorption of their photoreceptors, not visual color or spectra. We expect that our findings will contribute to a better understanding of plant perceptions of and responses to light quality, and improve the productivity of plants cultivated under artificial light.

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Academic Research Perspective of LEDs for the Horticulture Industry

Cited by 25 publications

References 49 publications

Analysis of Growth Parameters for Crop Vegetables under Broad and Narrow LED Spectra and Fluorescent Light Tubes at Different PPFs

Analysis of Growth Parameters for Crop Vegetables under Broad and Narrow LED Spectra and Fluorescent Light Tubes at Different PPFs

Usefulness of LED lightings in cereal breeding on example of wheat, barley and oat seedlings

Quantification of Spectral Perception of Plants with Light Absorption of Photoreceptors

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