Physiological responses of pepper seedlings to various ratios of blue, green, and red light using LED lamps

Claypool, Nicholas B.; Lieth, J. Heinrich

doi:10.1016/j.scienta.2020.109371

Cited by 40 publications

(26 citation statements)

References 29 publications

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“…In fact, stem elongation is usually associated with blue light (Kong et al, 2018 , 2019 ), while red light has been identified as responsible for inducing decreases in the concentration of indo-3-acetic acid (IAA; Liu et al, 2014 ). Even so, red light can also induce stem elongation (Claypool and Lieth, 2020 ; Manivannan et al, 2021 ), and it is important to consider that the sensitivity to different wavelengths varies from species to species and with the experimental conditions (Liu et al, 2014 ), although the mechanisms involved in these differential responses are not yet fully understood (Demotes-Mainard et al, 2016 ). Regarding leaves, both the total leaf area and the specific leaf area were higher in seedlings grown under red light.…”

Section: Discussionmentioning

confidence: 99%

Combinations of Blue and Red LEDs Increase the Morphophysiological Performance and Furanocoumarin Production of Brosimum gaudichaudii Trécul in vitro

et al. 2021

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Brosimum gaudichaudii is a plant species with medicinal relevance due to its furanocoumarin accumulation. The accumulation of these compounds in the root promotes predatory extractivism, which threatens the conservation of the species. In addition, little is known about the conditions for culturing of this species in vitro. The present study aimed to investigate how the application of different spectra of LEDs (white, blue, red, and combinations of blue and red at 1:1 and 3:1 ratios) can impact the morphophysiological and biochemical characteristics of B. gaudichaudii under different in vitro conditions. To evaluate the production of furanocoumarins in its leaves, which are easy-to-collect perennial organs, we cultured nodal segments in 50-mL tubes with MS medium under 100 μmol m−2 s−1 light and a photoperiod of 16 h for 50 days. We then submitted the seedlings biometric, anatomical, biochemical, and physiological evaluations. The different spectral qualities influenced several characteristics of the seedlings. Plants grown under red light showed greater stem elongation and larger and thinner leaves, strategies aimed at capturing a higher ratio of radiant energy. Exposure to the blue/red ratio of 1:1 induced increases in the concentration of the furanocoumarin psoralen, probably due to the diversion of carbon from primary metabolism, which resulted in lower growth. Cultivation under blue light or blue:red light at 3:1 triggered anatomical and physiological changes that led to higher production of secondary metabolites in the leaves, and at the 3:1 ratio, the seedlings also had a high growth rate. These results highlight the fundamental role of light in stimulating the production of secondary metabolites, which has important implications for the production of compounds of interest and indirect consequences for the conservation of B. gaudichaudii.

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Section: Discussionmentioning

confidence: 99%

Combinations of Blue and Red LEDs Increase the Morphophysiological Performance and Furanocoumarin Production of Brosimum gaudichaudii Trécul in vitro

et al. 2021

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“…Empirical data reveals that red-light benefits carbon dioxide (CO2) assimilation rate, while green-and blue-lights impair CO2 assimilation in low and moderate to high light conditions, respectively (Landi et al, 2020). A large number of studies have tested the effects of different light wavelengths on morphological growth, dry mass accumulation, gas exchange, and photosynthesis ( Kang et al, 2016;Claypool and Lieth, 2020;Yan et al, 2020). Results from these studies have limited application meaning unless they were tested in a widebandwidth spectrum (Landi et al, 2020).…”

Section: Academicpresmentioning

confidence: 99%

Light-emitting diode spectra modify nutritional status, physiological response, and secondary metabolites in Ficus hirta and Alpinia oxyphylla

Zhou

Shang

Feiyu

et al. 2021

Not Bot Horti Agrobo

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Lighting spectrum is one of the key factors that determine biomass production and secondary-metabolism accumulation in medicinal plants under artificial cultivation conditions. Ficus hirta and Alpinia oxyphylla seedlings were cultured with blue (10% red, 10% green, 70% blue), green (20% red, 10% green, 30% blue), and red-enriched (30% red, 10% green, 20% blue) lights in a wide bandwidth of 400-700 nm. F. hirta seedlings had lower diameter, fine root length, leaf area, biomass, shoot nutrient (N) and phosphorus concentrations in the blue-light spectrum compared to the red- and green-light spectra. In contrast, A. oxyphylla seedlings showed significantly higher concentrations of foliar flavonoids and saponins in red-light spectrum with rare responses in N, chlorophyll, soluble sugars, and starch concentrations. F. hirta is easily and negatively impacted by blue-light spectrum but A. oxyphylla is suitably used to produce flavonoid and saponins in red-light spectrum across a wide bandwidth.

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“…Supplementing a certain proportion of red and blue light with LEDs significantly improved root vigor and root/shoot ratio in tomatoes and cucumbers ( Paponov et al, 2020 ; Zhang Y. et al, 2020 ). Single light red, green, and blue LEDs increased the aboveground dry matter accumulation of peppers ( Claypool and Lieth, 2020 ). In this study, the root system of cucumbers was more developed and vigorous ( Table 2 ), and the dry matter accumulation in the upper and lower parts of the ground was greater ( Figure 3 ) under red and blue supplemental LED light treatments.…”

Section: Discussionmentioning

confidence: 99%

Physiological Responses of Cucumber Seedlings to Different Supplemental Light Duration of Red and Blue LED

et al. 2021

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Normal development of plants is inhibited by inadequate light in winter in greenhouses in Northwest China. Growth lamps, using light-emitting diodes (LEDs) with red blue light (7R2B), were used to supplement daylight for 1, 2, and 3 h. Seedling growth, photosynthesis, and photosynthetic product; the Calvin cycle key and sugar metabolism-related enzymes and their encoding genes; and the light signal sensing regulation of key gene expression were studied in greenhouse cucumbers under three treatments to determine the best supplemental light durations to enhance cucumber cultivation in greenhouses in winter. Treatment with LED red and blue light for 3 h significantly promoted the growth and development of cucumbers, root growth, and dry matter accumulation. It improved the photosynthetic rate, photosynthetic pigment content, and light energy utilization efficiency in cucumbers. Supplementation with red and blue LED light for 3 h upregulated the expression levels of key genes encoding the Calvin cycle and enzymes related to sugar metabolism in cucumber leaves, which promoted the synthesis and accumulation of photosynthates. The expression levels of phytochrome B, cryptochrome 1, and hypocotyl 5 in the cucumber leaves were also significantly upregulated after 3 h of light supplementation. Combined LED red and blue light for 3 h should be used to supplement natural light to enhance the cucumber cultivation in greenhouses in winter.

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Physiological responses of pepper seedlings to various ratios of blue, green, and red light using LED lamps

Cited by 40 publications

References 29 publications

Combinations of Blue and Red LEDs Increase the Morphophysiological Performance and Furanocoumarin Production of Brosimum gaudichaudii Trécul in vitro

Combinations of Blue and Red LEDs Increase the Morphophysiological Performance and Furanocoumarin Production of Brosimum gaudichaudii Trécul in vitro

Light-emitting diode spectra modify nutritional status, physiological response, and secondary metabolites in Ficus hirta and Alpinia oxyphylla

Physiological Responses of Cucumber Seedlings to Different Supplemental Light Duration of Red and Blue LED

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