Light Emitting Diodes With a High Proportion of Blue Light Affects External and Internal Quality Parameters of Pot Roses Differently Than the Traditional High Pressure Sodium Lamp

Terfa, Meseret Tesema; Poudel,; Roro, Amsalu Gobena; Olsen, Jorunn E.; Gislerød, Hans R.; Torre, Sissel

doi:10.17660/actahortic.2012.956.76

Cited by 19 publications

(14 citation statements)

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“…Further, when research is conducted in greenhouse conditions, the amount of natural light (that also encompasses blue light within) plays a role, as it could reverse physiological or chemical changes during an experiment (Ouzounis et al, 2014b). This could be in contrast with experiments conducted in growth chamber conditions where no natural light is present and, for example, significant changes in photosynthesis or flowering could be attributed solely to the presence of blue light (Terfa et al, 2012a(Terfa et al, , 2012b.…”

Section: Photoreceptors and The Role Of Light Qualitymentioning

confidence: 99%

Spectral Effects of Artificial Light on Plant Physiology and Secondary Metabolism: A Review

Ouzounis

Rosenqvist

Ottosen

2015

horts

286

147

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With the expeditious development of optoelectronics, the light-emitting diode (LED) technology as supplementary light has shown great advancement in protected cultivation. One of the greatest challenges for the LED as alternative light source for greenhouses and closed environments is the diversity of the way experiments are conducted that often makes results difficult to compare. In this review, we aim to give an overview of the impacts of light spectra on plant physiology and on secondary metabolism in relation to greenhouse production. We indicate the possibility of a targeted use of LEDs to shape plants morphologically, increase the amount of protective metabolites to enhance food quality and taste, and potentially trigger defense mechanisms of plants. The outcome shows a direct transfer of knowledge obtained in controlled environments to greenhouses to be difficult, as the natural light will reduce the effects of specific spectra with species or cultivar-specific differences. To use the existing high-efficiency LED units in greenhouses might be both energy saving and beneficial to plants as they contain higher blue light portion than traditional high-pressure sodium (HPS) lamps, but the design of light modules for closed environment might need to be developed in terms of dynamic light level and spectral composition during the day to secure plants with desired quality with respect to growth, postharvest performance, and specific metabolites.

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Section: Photoreceptors and The Role Of Light Qualitymentioning

confidence: 99%

Spectral Effects of Artificial Light on Plant Physiology and Secondary Metabolism: A Review

Ouzounis

Rosenqvist

Ottosen

2015

horts

286

147

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“…In addition, plants exhibited dark-purple zonal leaf bands under LED SL and sole-source lighting (SSL). Other reports indicate that overhead LED arrays providing monochromatic or combinations of narrow-spectrum SL produced comparable or higher quality plants than HPS lamps (Bergstrand and Sch€ ussler, 2012;Islam et al, 2012;Schamp et al, 2012;Terfa et al, 2013;Werner et al, 2011). In addition, several studies have reported increased anthocyanins or enhanced foliage color when plants were grown under LED arrays providing blue light.…”

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confidence: 99%

“…'Fairway Mosaic') when plants were grown under a 18-h photoperiod with SL from LEDs delivering a photosynthetic photon flux (PPF ) of 170 mmol · m -2 · s -1 at a light ratio of 75:25 red:blue compared with plants grown under HPS lamps. Similarly, Terfa et al (2013) analyzed the internal and external quality parameters of potted rose (Rosa ·hybrida L. 'Toril') grown in the greenhouse under a 20-h photoperiod and SL from HPS lamps or LEDs delivering a PPF of 100 mmol · m -2 · s -1 at a ratio of 80:20 red:blue light. They reported increased anthocyanin and chlorophyll content for LED-grown potted rose compared with HPS-grown plants (Terfa et al, 2013).…”

mentioning

confidence: 99%

“…Similarly, Terfa et al (2013) analyzed the internal and external quality parameters of potted rose (Rosa ·hybrida L. 'Toril') grown in the greenhouse under a 20-h photoperiod and SL from HPS lamps or LEDs delivering a PPF of 100 mmol · m -2 · s -1 at a ratio of 80:20 red:blue light. They reported increased anthocyanin and chlorophyll content for LED-grown potted rose compared with HPS-grown plants (Terfa et al, 2013). However, little is known regarding the short-term use of LEDs to enhance foliage color and the aesthetic quality of floriculture crops.…”

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confidence: 99%

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Geranium and Purple Fountain Grass Leaf Pigmentation Is Influenced by End-of-Production Supplemental Lighting with Red and Blue Light-emitting Diodes

Owen¹,

López²

2017

horts

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Under low-light greenhouse conditions, anthocyanin pigmentation in vegetative tissues of red- or purple-leafed floricultural crops is not fully expressed and, consequently, plants are not as visually appealing to consumers. Our objective was to quantify the effect of end-of-production (EOP; before shipping) supplemental lighting (SL) of different light sources, qualities, and intensities on foliage color of geranium (Pelargonium ×hortorum L.H. Bailey ‘Black Velvet’) and purple fountain grass [Pennisetum ×advena Wipff and Veldkamp (formerly known as Pennisetum setaceum Forsk. Chiov. ‘Rubrum’)]. Plants were finished under early (Expt. 1) and late (Expt. 2) seasonal greenhouse ambient solar light and provided with 16 hours of day-extension lighting from low-intensity light-emitting diode (LED) lamps [7:11:33:49 blue:green:red:far-red light ratio (%); control] delivering 4.5 μmol·m−2·s−1, or 16 hours of EOP SL from high-pressure sodium (HPS) lamps delivering 70 μmol·m−2·s−1, or LED arrays (100:0, 87:13, 50:50, or 0:100 red:blue) delivering 100 μmol·m−2·s−1, or 0:100 red:blue LEDs delivering 25 or 50 μmol·m−2·s−1. Geranium and fountain grass chlorophyll content and leaf color were estimated using a SPAD-502 chlorophyll meter and Minolta tristimulus colorimeter, respectively. Relative chlorophyll content (RCC) and foliage L* (lightness), C* (chroma; a measure of saturation), and h° (hue angle; a measure of tone) values were significantly influenced by EOP SL and days of exposure. Generally, RCC of geranium and fountain grass increased from 3 to 14 days of exposure to EOP SL from HPS lamps and LEDs delivering 100 μmol·m−2·s−1. Under low daily light integrals (DLIs) [8.6 mol·m−2·d−1 (geranium) and 9.4 mol·m−2·d−1 (purple fountain grass)] EOP SL providing 100 μmol·m−2·s−1 of 100:0, 87:13, 50:50, or 0:100 red:blue light for ≥14 days resulted in lower L* (darker foliage), C* (saturated), and h° (orange to violet-red hues). Our data indicate that a minimum of 14 days of EOP SL providing 100 μmol·m−2·s−1 of 50:50 or 0:100 red:blue light enhanced foliage color of geranium and fountain grass leaves when plants were grown under a low greenhouse DLI ≤ 9 mol·m−2·d−1.

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“…Blue light is known to play the main role in photomorhogenesis -therefore, it is necessary for the growth and development of higher plants (Terfa et al, 2012;Woźny 2011). In this study blue light significantly affected the length of hypocotyl and the height of plants.…”

Section: Morphological Parametersmentioning

confidence: 99%

The Effect of Different Doses of Blue Light on the Biometric Traits and Photosynthesis of Dill Plants

Frąszczak

2016

Not Bot Horti Agrobo

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The supplementation of blue light to red light enhanced plant growth compared with the use of red alone. The aim of the study was to determine the effect of different doses of blue light on the biometric traits and photosynthesis of dill plants. The plants were grown in pots in a growth chamber. They were grown in red light (100 μmol m -2 s -1 ) and blue light (from 10 to 50 μmol m -2 s -1 ) in five combinations. Light emitting diode modules were the source of light. The plants were evaluated every 7 days during vegetation, for the first time -seven days after germination and later on the 14 th , 21st and 28 th day after germination. The share of blue light in the spectrum significantly influenced the biometric traits of the dill plants. It significantly inhibited the elongation growth of the plants and negatively affected the increase in fresh weight. A small dose of blue light (20%) had positive effect on the plants' area. The research did not reveal a simple relationship between the amount of blue light and dry weight yield. The value of physiological indexes depended both on the combination and measurement time. The plants from the combination with 30% blue light were characterised by the greatest photosynthesis intensity. An effective share of blue light in the spectrum may range from 10 to 30% in relation to red light and depends on the plant's development phase and on the result we want to achieve in the cultivation of plants.

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Light Emitting Diodes With a High Proportion of Blue Light Affects External and Internal Quality Parameters of Pot Roses Differently Than the Traditional High Pressure Sodium Lamp

Cited by 19 publications

References 0 publications

Spectral Effects of Artificial Light on Plant Physiology and Secondary Metabolism: A Review

Spectral Effects of Artificial Light on Plant Physiology and Secondary Metabolism: A Review

Geranium and Purple Fountain Grass Leaf Pigmentation Is Influenced by End-of-Production Supplemental Lighting with Red and Blue Light-emitting Diodes

The Effect of Different Doses of Blue Light on the Biometric Traits and Photosynthesis of Dill Plants

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