Effect of Daily Light Integral on Cucumber Plug Seedlings in Artificial Light Plant Factory

Cui, Jiawei; Song, Shiwei; Yu, Jiangnan; Liu, Houcheng

doi:10.3390/horticulturae7060139

Cited by 22 publications

(20 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similar results were also observed in sweet basil [7], broccoli microgreens [8], and dwarf tomato [9]. Recently, more researchers paid attention to the daily light integral (DLI) and observed that increasing the DLI within limits could improve the growth status of plants and promote the accumulation of nutrients in plants [10][11][12]. Additionally, increasing the DLI in seasons with insufficient light could increase the stem firmness of cucumber seedlings, which was beneficial for mechanized transplanting [13].…”

Section: Introductionsupporting

confidence: 63%

The Combinations of White, Blue, and UV-A Light Provided by Supplementary Light-Emitting Diodes Promoted the Quality of Greenhouse-Grown Cucumber Seedlings

Yan

Wang

et al. 2022

Agriculture

View full text Add to dashboard Cite

Insufficient solar light in winter inside the greenhouse may lead to a lower quality of vegetable seedlings, and supplemental light is an effective technique to solve this problem. This study evaluated the impacts of supplementary white (W)-light-emitting diodes (LEDs), ultraviolet A LEDs (UV-A), white and blue LEDs (WB), the combinations of white and UV-A LEDs (W-UVA), and white, blue, and UV-A LEDs (WB-UVA) on the leaf morphology, photosynthetic traits, biomass accumulation, root architecture, and hormone content of cucumber (Cucumis sativus L. cv. Tianjiao No. 5) seedlings grown in the greenhouse. The results indicated that supplementary LED lighting led to a decreased plant height, shorter hypocotyl length, bigger leaf area, and thicker leaf compared with those grown with solar light only, regardless of light quality. The shoot fresh weight, root fresh weight, and seedling quality index of cucumber seedlings grown under the combinations of white, blue, and UVA radiations increased by 30.8%, 3.2-fold, and 1.8-fold, respectively, compared with those grown with natural light only. However, no significant differences were exhibited in the biomass accumulation of greenhouse-grown cucumber seedlings between the control and the UVA treatment. The cellulose content and stem firmness of greenhouse-grown cucumber seedlings grown under the combinations of white, blue, and UVA radiations increased by 49.9% and 13.1%, respectively, compared with those grown under white light only. Additionally, the cytokinin content of cucumber seedlings was promoted by over 36.7% by applying supplementary light. In summary, the combinations of white, blue, and UVA radiations led to compact morphological characteristics, superior mechanical properties, and preferable growth performance, which could be applied as an available lighting strategy to obtain the desired morphological and quality properties of vegetable seedlings.

show abstract

Section: Introductionsupporting

confidence: 63%

The Combinations of White, Blue, and UV-A Light Provided by Supplementary Light-Emitting Diodes Promoted the Quality of Greenhouse-Grown Cucumber Seedlings

Yan

Wang

et al. 2022

Agriculture

View full text Add to dashboard Cite

show abstract

“…Previous studies indicated that nutrient uptake and utilization by horticultural plants are changed by light parameters including light quality, light intensity, and photoperiod via a complex regulatory network (Chen et al, 2016;Kazemi et al, 2023;Paradiso & Proietti, 2022;Satari et al, 2022). Also, there is a link between light perception and nutrient uptake (Cui et al, 2019;Lin et al, 2020;Zhai et al, 2019). Other studies suggest that red light increases N content, while the blue-light spectrum is effective in absorption of P and K in Chinese chive (Allium tuberosum) plant (Chen, 2012).…”

Section: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

“…Light is a form of energy and can vary in quality (colour or wavelength distribution), quantity (intensity, or the amount of energy), and duration (photoperiod) (López et al, 2017). The light intensity is an important variable to consider since a higher intensity is correlated with higher electricity consumption (Cui et al, 2021). Therefore, a low light intensity can be most advantageous from this point of view.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a low light intensity can be most advantageous from this point of view. Optimizing intensity, spectrum, and photoperiod could accelerate plant growth (Cui et al, 2021) and maximize harvestable yield (Kelly et al, 2020). According to Kozai and Niu (2020a), a relatively low light intensity of 100 to 300 µmol m -2 s -1 is required in indoor systems.…”

Section: Introductionmentioning

confidence: 99%

“…Kozai and Niu (2020a) mentioned that electricity consumption for lighting to increase the dry mass of plants reached about 20 to 30% of total costs (Kozai and Niu, 2020b). For the production of annual herbaceous plants, the recommended intensity is 95 to 140 µmol m -2 s -1 (Currey et al, 2012), while for cucumber seedlings, it is 110 to 125 µmol m -2 s -1 (Cui et al, 2021). Various studies have been conducted on lettuce with intensities above 100 µmol m -2 s -1 (Hoenecke et al, 1992;Johkan et al, 2010;Chen et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In-door germination and seedling growth of green and red lettuce under LED-light spectrum and subsequent effect on baby leaf lettuce

2022

View full text Add to dashboard Cite

The spectrum and intensity of light play a significant role in the primary and secondary metabolism of plants. Low intensity can make the photosynthetic process less efficient, while inadequate spectrum can impair plant growth and quality. This study investigates the effect of different LED light spectra at low intensity on germination and growth of lettuce (Lactuca sativa L.) seedlings under a temperature-controlled chamber and the subsequent impact on mature plants grown in a greenhouse under natural light. The purpose was to reach a commercial plant seedling using a low amount of energy to achieve the yield potential in a shorter period. The experiment was carried out in three trials. In trial 1, the effect of different LED light wavelengths [100% blue (B); 100% red (R); mixed light 1 (52% blue, 27% green and 21% red) (BGR1), and mixed light 2 (29% blue, 53% green and 17% red and 1% far red) (BGR2)] at low intensity (55 μmol m–2 s–1 and 12 h light photoperiod) and darkness (control) on germination of two lettuce cultivars [‘Levistro’ (green) and ‘Carmolí’ (red)] was evaluated in a controlled temperature chamber (20±1.2°C). In trial 2, the effect of the same light conditions of the first experiment on agronomic characteristics and pigment contents of lettuce seedlings compared to the natural light (control: 451±66 μmol m–2 s–1) were evaluated. In trial 3, the seedlings developed under different LED light wavelengths were transplanted to evaluate the subsequent effect on the growth of baby lettuce cultivated hydroponically in the greenhouse under natural light. The results of this study show that red wavelength reduced germination percentage, while lights with a higher blue component (B and BGR1) accelerated germination and increased the number of germinated seeds in ‘Levistro’. Red also delayed germination and decreased the number of germinated seeds in ‘Carmolí’ compared to darkness. Seedlings of ‘Levistro’ had a higher fresh weight (FW) than ‘Carmolí’. In addition, FW increased under BGR2 and R, which coincided with the highest number of leaves and leaf length. Nevertheless, fresh weight was higher under BGR2 and B after transplanting, coinciding with the highest number of leaves. A higher blue component of the light (B and BGR1) increased the dry matter percentage (DMP) of seedlings, but there was no significant difference after transplanting. Chlorophyll (CHL) a and b content increased under BGR2; however, the highest CHL a/b ratio was observed under BGR1 in ‘Levistro’ and B in ‘Carmolí’, but it was higher after transplanting when seedlings were grown under B. The anthocyanin (ANT) content of ‘Carmolí’ seedlings was promoted by a higher blue component of the light (B and BGR1) but significantly increased under natural light (control) at the highest intensity. This work shows that varying the spectrum at low intensity can positively modify the growth and biochemical characteristics of lettuce seedlings, although the effect depends on the cultivar. This modification improves the performance of plants during greenhouse growth after transplanting, especially seedlings grown under B and BGR2. Highlights - Blue light enhanced germination and increased the number of germinated seeds of green lettuce. - High blue component lights improved the morphology, dry matter percentage, and chlorophyll a/b ratio of lettuce seedlings. - Blue and full-spectrum lights applied to lettuce seedlings affect fresh weight after transplanting. - The anthocyanin content of seedlings was stimulated by blue light at 55 μmol m–2 s–1, but even more so by PAR of natural light at 451 μmol m–2 s–1.

show abstract

Effect of Daily Light Integral on Cucumber Plug Seedlings in Artificial Light Plant Factory

Cited by 22 publications

References 42 publications

The Combinations of White, Blue, and UV-A Light Provided by Supplementary Light-Emitting Diodes Promoted the Quality of Greenhouse-Grown Cucumber Seedlings

The Combinations of White, Blue, and UV-A Light Provided by Supplementary Light-Emitting Diodes Promoted the Quality of Greenhouse-Grown Cucumber Seedlings

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

In-door germination and seedling growth of green and red lettuce under LED-light spectrum and subsequent effect on baby leaf lettuce

Contact Info

Product

Resources

About