Spectral composition from led lighting during storage affects nutraceuticals and safety attributes of fresh-cut red chard (Beta vulgaris) and rocket (Diplotaxis tenuifolia) leaves

2021 ◽  
Vol 175 ◽  
pp. 111500 ◽  
Author(s):  
Giuseppina Pennisi ◽  
Francesco Orsini ◽  
Noelia Castillejo ◽  
Perla A. Gómez ◽  
Andrea Crepaldi ◽  
...  
Keyword(s):  
Beta Vulgaris ◽  
Spectral Composition ◽  
Led Lighting ◽  
Fresh Cut ◽  
Safety Attributes

scholarly journals Analysis of variability of quantitave traits of Vaccinium corymbosum L. ex vitro under different lighting modes

2019 ◽  
pp. 22-28
Author(s):  
Marta P. Fedorenko ◽  
Anton A. Volotovich ◽  
Oksana A. Kudryashova
Keyword(s):  
Comparative Analysis ◽  
Plant Growth ◽  
Growth Parameters ◽  
Spectral Composition ◽  
Vaccinium Corymbosum ◽  
Ex Vitro ◽  
Led Lighting ◽  
Led Light

The article presents the results of studies on the comparative analysis of bioproductional parameters of plant growth of Bluecrop and Elizabeth high-bush blueberry ex vitro under the conditions of fluorescent and LED lighting. Ensuring the optimal spectral composition of radiation, realized with the original LED light, led to a significant increase at 1.1–1.6 times in all of the analyzed growth parameters in high-bush blueberry ex vitro plants.

scholarly journals LED Lighting in Horticulture

HortScience ◽  
2008 ◽  
Vol 43 (7) ◽  
pp. 1947-1950 ◽  
Author(s):  
Robert C. Morrow
Keyword(s):  
Solid State ◽  
Large Scale ◽  
Space Shuttle ◽  
Space Station ◽  
Spectral Composition ◽  
Light Output ◽  
Plant Morphology ◽  
Heat Output ◽  
Led Lighting ◽  
Lighting Systems

Solid-state lighting based on the use of light-emitting diodes (LEDs) is potentially one of the biggest advancements in horticultural lighting in decades. LEDs can play a variety of roles in horticultural lighting, including use in controlled environment research, lighting for tissue culture, and supplemental and photoperiod lighting for greenhouses. LED lighting systems have several unique advantages over existing horticultural lighting, including the ability to control spectral composition, the ability to produce very high light levels with low radiant heat output when cooled properly, and the ability to maintain useful light output for years without replacement. LEDs are the first light source to have the capability of true spectral composition control, allowing wavelengths to be matched to plant photoreceptors to provide more optimal production and to influence plant morphology and composition. Because they are solid-state devices, LEDs are easily integrated into digital control systems, facilitating special lighting programs such as “daily light integral” lighting and sunrise and sunset simulations. LEDs are safer to operate than current lamps because they do not have glass envelopes or high touch temperatures, and they do not contain mercury. The first sustained work with LEDs as a source of plant lighting occurred in the mid-1980s to support the development of new lighting systems to be used in plant growth systems designed for research on the space shuttle and space station. These systems progressed from simple red-only LED arrays using the limited components available at the time to high-density, multicolor LED chip-on-board devices. As light output increases while device costs decrease, LEDs continue to move toward becoming economically feasible for even large-scale horticultural lighting applications.

scholarly journals Protein accumulation and expression of the nitrate reductase gene in Spirulina platensiscells depending on the spectral composition of led radiation

2019 ◽  
Vol 64 (2) ◽  
pp. 180-189
Author(s):  
N. V. Kozel ◽  
M. S. Radyuk ◽  
T. V. Samovich ◽  
I. A. Dremuk ◽  
L. S. Gabrielyan
Keyword(s):  
Nitrate Reductase ◽  
Spectral Composition ◽  
Dry Weight ◽  
Protein Accumulation ◽  
Control Analysis ◽  
Nitrate Reductase Gene ◽  
Gene Encoding ◽  
Led Lighting ◽  
Reductase Gene ◽  
Red Leds

The effect of LED lighting of different spectral composition on the productivity of Spirulina platensis, an accumulation of protein in alga cells and an expression of the nitrate reductase gene has been studied. It was shown that LED lighting with a predominance of the red component in the emission spectrum allows achieving 9–29 % higher alga productivity compared to using fluorescent lamp illumination. Illumination with single blue light resulted in significant (83 %) decrease in the productivity of Spirulina platensiswhich apparently was due to the absence of the yellow and red components in the illuminator spectral composition, which are most effectively absorbed by phycocyanin. A positive correlation between an increase in the productivity of alga and the accumulation of protein in its cells was found. So, by using an illuminator with red LEDs, the protein content increased by 21 % calculated per gram of dry weight and 47 % calculated per liter of suspension relative to the control. Analysis of the expression of the Nar gene encoding nitrate reductase in Spirulina platensiscells did not reveal a direct dependence between an increasing protein accumulation and an expression level of the Nar gene in the most promising in terms of biomass and protein yield sample of alga, growing under red LEDs. This indicates the crucial role of the photosynthetic activity of Spirulina platensiscells in increasing productivity and protein synthesis.

Influence of the spectral composition of optical radiation on the growth and development of the strawberries

2020 ◽  
Vol 60 (1) ◽  
pp. 74-80
Author(s):  
A. A. Smirnov ◽  
Y. A. Proshkin ◽  
A. V. Sokolov
Keyword(s):  
Growth And Development ◽  
Optical Radiation ◽  
Visible Region ◽  
Spectral Composition ◽  
F1 Hybrids ◽  
Artificial Light ◽  
Led Lighting ◽  
Berry Crops ◽  
Red Radiation ◽  
Different Parts

Recently, urban farms for growing green and berry crops with artificial light are gaining popularity. The effect of different parts of the spectrum in the visible region on vegetable and berry crops has been studied extensively, but the influence of ultraviolet and far red radiation requires more detailed studies. The purpose of the work was to study the influence of the spectral composition of the radiation of LEDs on the flowering and fruiting of strawberries. For research Elan F1 and Florian F1 hybrids of everbearing strawberries were chosen. Plants were grown in phytocameras on racks with artificial LED lighting. It has been established that with a fraction of the far red component of at least 15 % in radiation, an increase in leaf area and the length of peduncles occurs.

scholarly journals Features of the Organisation of Rooting Cuttings of Decorative Woody Plants Under Artificial Lighting with Led Equipment

2021 ◽  
Vol 9 (4) ◽  
pp. 149-158
Author(s):  
Andrei M. Piatykh ◽  
Mikhail A. Emelianov ◽  
Aleksandr V. Akinchin ◽  
Ivan V. Partolin ◽  
Alla A. Belyaeva
Keyword(s):  
Woody Plants ◽  
Spectral Composition ◽  
Green Building ◽  
Dynamic Regulation ◽  
Led Lighting ◽  
Artificial Lighting ◽  
Batch Type ◽  
Planting Material ◽  
Lighting Conditions ◽  
Slow Growing

Obtaining a technology for rooting cuttings and standard seedlings of decorative woody plants under artificial lighting conditions is relevant in connection with the need to increase the amount of planting material required for green building. Currently, cuttings are carried out mainly in greenhouses during the growing season. The development of technology for rooting cuttings using lamps with different lighting parameters opens up the possibility of creating installations that are effective in various conditions. In the course of the study, organisational and technological measures were taken to modernise the greenhouse and install equipment for growing planting material of decorative plants. In accordance with the plan to study the characteristics of various crops using the technology of dynamic regulation of the spectral composition and temporal characteristics of LED lighting in a greenhouse, an assortment of decorative tree species has been developed. Heated greenhouses are equipped with automatic irrigation hotbeds. Cutting of coniferous, deciduous, fast- and slow-growing species of decorative woody plants (7 species and 3 cultivars in total) was carried out. Rooting was carried out under illumination with batch-type LED installations. The success of rooting is studied when using LEDs of various production, with different spectral composition and varying illumination intensity during year-round cultivation. The findings are necessary not only for the development of a regional technology for the year-round production of rooted cuttings of decorative woody plants, but also for the development of the engineering specifics of lighting equipment.

scholarly journals The impact of LED lightning on the content of photosynthetic pigments in tomato leaves

2021 ◽  
pp. 117-120
Author(s):  
T. V. Nikanovich ◽  
Yu. V. Trofimov ◽  
M. I. Barkun
Keyword(s):  
Photosynthetic Pigments ◽  
Spectral Composition ◽  
Leaf Tissue ◽  
Spectral Ratio ◽  
Inhibitory Effect ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Blue Band ◽  
Led Lighting ◽  
The Impact

Relevance and methods. We studied the influence of LED lighting of different spectral composition on the content of photosynthetic pigments in tomato leaves to identify the most optimal lighting option suitable for obtaining high-quality seedlings under controlled conditions. We used LED lamps in which the ratio of the photon flux density (PFD) of the orange-red band (607–694 nm) to the PFD of the blue band (400–495 nm) varied from 1 to 20. In this case, the proportion of the PFD in the range 580-607 nm ( yellow) ranged from 13 to 22%, and the fraction of photons in the range 495–580 nm (green) ranged from 18 to 38%. The research was carried out with two varieties of Belarusian tomato varieties, which differed in a number of morphobiological characteristics.Results. It was found that the use of LED lighting of different spectral composition had mainly an inhibitory effect on the biosynthesis of chlorophylls and carotenoids in the leaf tissue of plants. The decrease in the amount of pigments, in comparison with the control variant, reached 47-57%. It was revealed that under all studied lighting options, with the exception of conditions where the spectral ratio R / B ("red/blue") was 0.8, the value of the total inhibitory effect in the Cherry Coral variety was 1.2-1.7 times lower than that of the Zorka variety, which indicated a significantly lower susceptibility of the pigment fund of the former to LED lighting. The smallest inhibitory effect of the latter on the biosynthesis of photosynthetic pigments in both tomato varieties was established at a photon flux of 69.1 μmol/s, while the greatest, exceeding it by 3.0-3.1 times in the Zorka variety and 4.5-5.3 times for the Cherry Coral variety with a photon flux of 73.9 μmol/s.

scholarly journals LED Lighting Strategies Affect Physiology and Resilience to Pathogens and Pests in Eggplant (Solanum melongena L.)

2021 ◽  
Vol 11 ◽  
Author(s):  
J. Anja Dieleman ◽  
H. Marjolein Kruidhof ◽  
Kees Weerheim ◽  
Kirsten Leiss
Keyword(s):  
Powdery Mildew ◽  
Flux Density ◽  
Blue Light ◽  
Red Light ◽  
Solanum Melongena ◽  
Spectral Composition ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Led Lighting ◽  
Greenhouse Horticulture

Over the last decade, LED lighting has gained considerable interest as an energy-efficient supplemental light source in greenhouse horticulture that can change rapidly in intensity and spectral composition. Spectral composition not only affects crop physiology but may also affect the biology of pathogens, pests, and their natural enemies, both directly and indirectly through an impact on induced plant resistance. In this study, we investigated the effects of light spectrum against a background of sunlight on growth and development of Solanum melongena. These effects were related to the spectral effects on the establishment of populations of the predatory mite Amblyseius swirskii and plant resilience against the biotrophic fungus powdery mildew, the necrotrophic fungus botrytis, and the herbivorous arthropod Western flower thrips. The effects of a reduced red/far-red (R:FR) ratio were studied under two ratios of red to blue light. Far-red light either was supplied additionally to the photosynthetic photon flux density (PPFD) or partially replaced PPFD, while maintaining total photon flux density (PFD). Effects of white light or additional UV-B light on plant resilience was tested, compared to the reference (5% blue, 5% green, and 90% red light). Plant biomass in the vegetative phase increased when additional far-red light was supplied. Stem length increased with far-red, irrespective of PPFD and the percentage of blue light. In the generative phase, total shoot biomass and fruit fresh weights were higher under additional far-red light, followed by the treatments where far-red partly replaced PPFD. Far-red light increased biomass partitioning into the fruits, at the expense of the leaves. There were no differences in population growth of A. swirskii mites between light treatments, nor did light treatment have an effect on the vertical distribution of these predatory mites in the plants. The treatments with additional far-red light reduced the infection rate of powdery mildew, but increased botrytis infection. These differences might be due to the plant defenses acting against these pathogens evolving from two different regulatory pathways. These results show that positive effects of altered spectral compositions on physiological responses were only moderately compensated by increased susceptibility to fungal pathogens, which offers perspective for a sustainable greenhouse horticulture.

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