Effects of HPS and LED lighting on cucumber leaf photosynthesis, light quality penetration and temperature in the canopy, plant morphology and yield

Särkkä, Liisa; Jokinen, Kari; Ottosen, Carl‐Otto; Kaukoranta, Timo

doi:10.23986/afsci.60293

Cited by 42 publications

(25 citation statements)

References 17 publications

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“…In this article, we provide evidence that LED lighting with an emission spectrum that partially matches the range of 400 to 700 nm can accelerate plant growth and increase the yield of tomatoes. Similar results in terms of the stem development were demonstrated for cucumbers, sweet basil, and tomatoes when a combination of blue, green, and red LEDs (Särkkä et al, 2017); blue, yellow, and red LEDs (Carvalho et al, 2016); or only green LEDs combined with daylight (Snowden et al, 2016) was used, respectively. Our yield data, however, are different to others, who have reported that a LED lighting with an emission spectrum that is optimized for chlorophyll absorption (blue and red) produces similar or even less yield than HPS lighting (Dueck et al, 2011;Gomez et al, 2013;Fanwoua et al, 2019).…”

Section: Plant Growth and Yield Under Different Supplementary Lightingssupporting

confidence: 73%

Increase of Yield, Lycopene, and Lutein Content in Tomatoes Grown Under Continuous PAR Spectrum LED Lighting

et al. 2021

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Light emitting diodes (LEDs) are an energy efficient alternative to high-pressure sodium (HPS) lighting in tomato cultivation. In the past years, we have learned a lot about the effect of red and blue LEDs on plant growth and yield of tomatoes. From previous studies, we know that plants absorb and utilize most of the visible spectrum for photosynthesis. This part of the spectrum is referred to as the photosynthetically active radiation (PAR). We designed a LED fixture with an emission spectrum that partially matches the range of 400 to 700 nm and thus partially covers the absorption spectrum of photosynthetic pigments in tomato leaves. Tomato plants grown under this fixture were significantly taller and produced a higher fruit yield (14%) than plants grown under HPS lighting. There was no difference in the number of leaves and trusses, leaf area, stem diameter, the electron transport rate, and the normalized difference vegetation index. Lycopene and lutein contents in tomatoes were 18% and 142% higher when they were exposed to the LED fixture. However, the ß-carotene content was not different between the light treatments. Transpiration rate under LED was significantly lower (40%), while the light use efficiency (LUE) was significantly higher (19%) compared to HPS lighting. These data show that an LED fixture with an emission spectrum covering the entire PAR range can improve LUE, yields, and content of secondary metabolites in tomatoes compared to HPS lighting.

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Section: Plant Growth and Yield Under Different Supplementary Lightingssupporting

confidence: 73%

Increase of Yield, Lycopene, and Lutein Content in Tomatoes Grown Under Continuous PAR Spectrum LED Lighting

et al. 2021

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“…Another study ( Wallace and Both, 2016 ), compared PPNE in LED lamps from different manufacturers, presenting values of 1.4 μmol J −1 (Valoya R150 NS1, RB = 2, PPFD = 184 μmol m −2 s −1 ), 0.8 μmol J −1 (Orbitec LED tower, RB = 3, PPFD = 84 μmol m −2 s −1 ) and 1.4 μmol J −1 (Cree 18W Daylight, RB = 1.3, PPFD = 4 μmol m −2 s −1 ). PPNE was also shown to be around 1.3 μmol J −1 in a red-blue top-light (Valoya AP-67, RB = 3, PPFD = 160 μmol m −2 s −1 ) ( Särkkä et al, 2017 ). Nájera et al (2018) reported PPNE to range 0.9 (Valoya AP-67, RB = 3, PPFD = 64 μmol m −2 s −1 ) to 1.2 (Valoya AP673, RB = 5, PPFD = 85 μmol m −2 s −1 ), although details in the measurements performed for quantifying electricity consumption or R:B ratio were lacking.…”

Section: Discussionmentioning

confidence: 99%

Unraveling the Role of Red:Blue LED Lights on Resource Use Efficiency and Nutritional Properties of Indoor Grown Sweet Basil

et al. 2019

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Indoor plant cultivation can result in significantly improved resource use efficiency (surface, water, and nutrients) as compared to traditional growing systems, but illumination costs are still high. LEDs (light emitting diodes) are gaining attention for indoor cultivation because of their ability to provide light of different spectra. In the light spectrum, red and blue regions are often considered the major plants’ energy sources for photosynthetic CO2 assimilation. This study aims at identifying the role played by red:blue (R:B) ratio on the resource use efficiency of indoor basil cultivation, linking the physiological response to light to changes in yield and nutritional properties. Basil plants were cultivated in growth chambers under five LED light regimens characterized by different R:B ratios ranging from 0.5 to 4 (respectively, RB0.5, RB1, RB2, RB3, and RB4), using fluorescent lamps as control (CK1). A photosynthetic photon flux density of 215 μmol m−2 s−1 was provided for 16 h per day. The greatest biomass production was associated with LED lighting as compared with fluorescent lamp. Despite a reduction in both stomatal conductance and PSII quantum efficiency, adoption of RB3 resulted in higher yield and chlorophyll content, leading to improved use efficiency for water and energy. Antioxidant activity followed a spectral-response function, with optimum associated with RB3. A low RB ratio (0.5) reduced the relative content of several volatiles, as compared to CK1 and RB ≥ 2. Moreover, mineral leaf concentration (g g−1 DW) and total content in plant (g plant−1) were influences by light quality, resulting in greater N, P, K, Ca, Mg, and Fe accumulation in plants cultivated with RB3. Contrarily, nutrient use efficiency was increased in RB ≤ 1. From this study it can be concluded that a RB ratio of 3 provides optimal growing conditions for indoor cultivation of basil, fostering improved performances in terms of growth, physiological and metabolic functions, and resources use efficiency.

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“…This differs from the existing supplementary lighting system of the Venlo-type greenhouses that mainly aims to increase light intensity. Moreover, the greenhouse temperature was increased by ~1-1.4°C during the experiment due to the application of HPS lamps that emit near infrared radiation, which also positively affects plant growth and development (Särkkä et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Effects of Supplementary Artificial Light on Growth of the Tomato (<i>Solanum lycopersicum</i>) in a Chinese Solar Greenhouse

Yan

Zhang

et al. 2018

The Hortic J

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Light is one of the most limiting factors affecting plant growth in greenhouses. Recently, supplementary artificial light has been widely used in greenhouse production in winter or on overcast days when solar radiation is weak. However, plant responses to supplementary artificial light in a Chinese Solar Greenhouse (CSG) and the economic feasibility of the lighting strategy are poorly understood. The tomato, one of the most widely produced and consumed vegetables in the world, was tested in this study. A CSG was divided into three sections, and three treatments were arranged. They were top lighting with HPS lamps (TL), TL plus interlighting with LEDs (TL+IL), and control treatment without artificial light, respectively. We showed that supplementary artificial light improved the uniformity of light distribution from the south to north end of the CSG, and increased the average greenhouse temperature by ~1-1.4°C. Tomato yield was increased by 21.8% and 32.9% in TL and TL+IL, respectively, compared with that of the control. The higher yield under supplementary artificial light resulted from a larger number of ripe fruits rather than bigger fruit size. Moreover, fruit quality was improved by supplementary artificial light as indicated by a higher total soluble sugar content. There were no significant differences in total biomass production or total soluble sugar content in leaves, as well as fruits, between TL and TL+IL treatments, but TL+IL further stimulated fruit maturation compared with TL. Although supplementary artificial light confers an advantage in terms of tomato growth, it is not economically feasible as 28.8 kWh electricity was required to increase the tomato yield by 1 kg in the CSG. Therefore, it is important to find solutions to increase the efficiency of supplementary artificial light in the CSG.

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Effects of HPS and LED lighting on cucumber leaf photosynthesis, light quality penetration and temperature in the canopy, plant morphology and yield

Cited by 42 publications

References 17 publications

Increase of Yield, Lycopene, and Lutein Content in Tomatoes Grown Under Continuous PAR Spectrum LED Lighting

Increase of Yield, Lycopene, and Lutein Content in Tomatoes Grown Under Continuous PAR Spectrum LED Lighting

Unraveling the Role of Red:Blue LED Lights on Resource Use Efficiency and Nutritional Properties of Indoor Grown Sweet Basil

Effects of Supplementary Artificial Light on Growth of the Tomato (<i>Solanum lycopersicum</i>) in a Chinese Solar Greenhouse

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