The influence of the LED light spectrum on the growth and nutrient uptake of hydroponically grown lettuce

Pinho, Paulo; Jokinen, Kari; Halonen, Liisa

doi:10.1177/1477153516642269

Cited by 49 publications

(43 citation statements)

References 26 publications

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“…Our results show opposite trends between shoot dry mass and SPAD index ( Figures 2D and 3C). Similar to our findings, others have reported a reduction in chlorophyll concentration with higher lettuce growth based on either non-destructive measurements of leaf greenness (e.g., SPAD index) or chlorophyll extraction [47][48][49]. The increase in SPAD index with higher blue light could be attributed to a reduction in plant growth, which has been shown to lead to an accumulation of higher chlorophyll content on a per-unit leaf mass basis and/or a potential increase in chlorophyll biosynthesis [9].…”

Section: Physiological Responsessupporting

confidence: 91%

Growth, Water-Use Efficiency, Stomatal Conductance, and Nitrogen Uptake of Two Lettuce Cultivars Grown under Different Percentages of Blue and Red Light

2018

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The objective of this study was to characterize growth, water-use efficiency (WUE), stomatal conductance (g s ), SPAD index values, and shoot nitrogen uptake of two lettuce cultivars grown under different percentages of blue and red light. The treatments evaluated were 100% red; 7% blue + 93% red; 26% blue + 74% red; 42% blue + 58% red; 66% blue + 34% red; and 100% blue. Broad-spectrum (19% blue, 43% green, and 38% red) light was used to observe the effects of wavelength interactions. All of the treatments provided an average daily light integral (DLI) of 17.5 mol·m -2 ·d -1 (270 ± 5 µmol·m -2 ·s -1 over an 18-h photoperiod). The experiment was replicated three times over time; each terminated 21 days after treatment initiation. Leaf area, specific leaf area (SLA), and SPAD index had a similar response in that all of the parameters increased with up to 66% blue light, and slightly decreased or remained constant with 100% blue light. In contrast, leaf number, shoot dry mass, and WUE generally decreased in response to blue light. Conversely, for every 10% increase in blue light, g s increased by 10 mmol·m -2 ·s -1 . Nitrogen uptake was unaffected by light quality. Our findings indicate that when grown under different blue and red photon flux ratios, the WUE of lettuce significantly decreases under higher blue light, which could be attributed to a reduction in plant growth (leaf number and dry mass), and an increase in g s . However, green light within broad-spectrum lamps might counteract blue-light mediated effects on g s and WUE in lettuce.

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Section: Physiological Responsessupporting

confidence: 91%

Growth, Water-Use Efficiency, Stomatal Conductance, and Nitrogen Uptake of Two Lettuce Cultivars Grown under Different Percentages of Blue and Red Light

2018

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“…Greenhouse vegetable yield is influenced by different light colours (Table 2). Fresh weight of lettuce, baby leaf lettuce and red leaf lettuce was observed to increase under additional far red lighting (Li and Kubota, 2009;Stutte et al, 2009;Lee et al, 2015;Chen et al, 2016;Lee et al, 2016;Pinho et al, 2017).…”

Section: Yield Of Vegetables Influenced By Differ-ent Light Coloursmentioning

confidence: 95%

“…Far red light increases total biomass (Lee et al, 2016;Pinho et al, 2017), while at the same time increases plant elongation (Stutte et al, 2009) and decreases pigment concentration of plants (Li and Kubota, 2009). As plant elongation and decrease in pigment concentration are not desirable, this increase of biomass is not very advantageous.…”

Section: Forewordmentioning

confidence: 99%

“…Greenhouse vegetable growth is influenced by light colour (Table 1). Far red lighting increases growth of lettuce (Lee et al, 2016;Pinho et al 2017). It elongates leaves in baby leaf lettuce (Li and Kubota, 2009), red lettuce (Lee et al, 2015) and in red leaf lettuce (Stutte et al, 2009) resulting in taller plants (Brown et al, 1995).…”

Section: Growthmentioning

confidence: 99%

“…Mineral elements. Far red light stimulated uptake of N and K, Ca, and Mg with the latter increasing by 27%, 25%, and 28%, respectively, compared to plants illuminated with red and blue light (Pinho et al, 2017). Blue light increased N concentration in cucumber plants (Hogewoning et al, 2010) but reduced nitrate concentration in Chinese kale (Xin et al, 2015).…”

Section: Nutritional Qualitymentioning

confidence: 99%

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Influence of Wavelength of Light on Growth, Yield and Nutritional Quality of Greenhouse Vegetables

Olle

Alsiņa

2019

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

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All previous reviews of research on light-emitting diodes (LEDs) have been focused on how different light spectra generally influence plant yield and quality. There are no or almost no reviews on the effect of spectra on sugars or pigment concentration, or yield and growth etc. The role of visible light in food production, as in agriculture and horticulture, is obvious, as light drives photosynthesis, which is crucial for plant growth and development. Solid state lighting using LEDs represents a fundamentally different technology from gaseous discharge-type lamps currently in use. LEDs are important lamp types because the concentration of the light spectrum they emit can be changed to provide plants at various developmental stages with the light spectrum needed. A great deal of studies have been done on the effect of wavelengths of light on growth, yield and nutritional quality of greenhouse vegetables. However, little is known about the mechanisms by which the spectra affect sugar and pigment concentration, and yield, and growth. This article provides a list of how spectra influence the yield, growth, and nutritional quality of greenhouse-grown vegetables. Based on the given information we can conclude that blue, green, and red light are the main light colours that influence positively plant yield, growth and nutrient quality. Sometimes in specific situations, some other light colours are also beneficial, like far red light, orange light and UVA light. Future work on light colour manipulation has potential for producing lamps and greenhouse covers that better support plant yield, growth, and nutrition.

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Spectral composition of LED light differentially affects biomass, photosynthesis, nutrient profile, and foliar nitrate accumulation of lettuce grown under various replacement methods of nutrient solution

Soufi,

Roosta,

Fatehi

et al. 2023

Food Science & Nutrition

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To enhance crop yield and quality, plant cultivation in controlled‐growing systems is an alternative to traditional open‐field farming. The use of light‐emitting diode (LED) as an adjustable light source represents a promising approach to improve plant growth, metabolism, and function. The objective of this study was to assess the impact of different light spectra (red, red/blue (3:1), blue, and white) with an emission peak of around 656, 656, 450, and 449 nm, respectively, under various replacement methods of nutrient solution (complete replacement (CR), EC‐based replacement (ECBR), and replacing based on plant needs (RBPN)), on biomass, physiological traits, and macro‐ and micronutrient contents of two best‐known lettuce varieties, Lollo Rossa (LR) and Lollo Bionda (LB), in the nutrient film technique (NFT) hydroponic system. The results indicated that mix of red and blue LED spectra under RBPN method is the most effective treatment to enhance fresh and dry weights of lettuce plants. In addition, red LED spectrum under RBPN, and red and blue light under ECBR nutrient solution significantly increased leaf stomatal conductance, net photosynthesis and transpiration rate, and intercellular CO2 concentration of LR variety. Phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mn) content in LR variety, and iron (Fe), zinc (Zn), copper (Cu), and manganese (Mn) content in both varieties increased upon exposure to blue and red LED light spectrum with RBPN method. Our results suggest that exposure to combination of red and blue light along with feeding plants using RBPN and ECBR methods can increase absorption of macro‐ and micronutrient elements and improve photosynthetic properties, and eventually increase lettuce yield with lower nitrate accumulation.

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The influence of the LED light spectrum on the growth and nutrient uptake of hydroponically grown lettuce

Cited by 49 publications

References 26 publications

Growth, Water-Use Efficiency, Stomatal Conductance, and Nitrogen Uptake of Two Lettuce Cultivars Grown under Different Percentages of Blue and Red Light

Growth, Water-Use Efficiency, Stomatal Conductance, and Nitrogen Uptake of Two Lettuce Cultivars Grown under Different Percentages of Blue and Red Light

Influence of Wavelength of Light on Growth, Yield and Nutritional Quality of Greenhouse Vegetables

Spectral composition of LED light differentially affects biomass, photosynthesis, nutrient profile, and foliar nitrate accumulation of lettuce grown under various replacement methods of nutrient solution

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