Abstract
Plant factories with artificial lighting have been developed to improve food production, functional ingredients, and profitability. Intensive research has been performed to elucidate the effects of light intensity and wavelength on plant growth and nutritional quality with the use of light-emitting diodes (LEDs). In particular, the effects of monochromatic red, blue, or simultaneous red + blue light have been studied because these wavelengths are predominantly used for photosynthesis. We examined the effects of alternating red and blue light provided by LEDs over a period of 24 hours on the growth and nutritional properties of leafy lettuce. The results clearly show that alternating red and blue light accelerated plant growth significantly compared with white fluorescent lamps or red and blue LEDs at the same daily light integral. Plants grown under alternating red/blue light had a greater net assimilation rate and total and projected leaf area (an indicator of the fraction of leaf area that absorbs more light) than other plants. Additionally, alternating red and blue light maintained high concentrations of sugars, ascorbic acid, and anthocyanins in leaves. Taken together, the results indicate that continuous irradiation with alternating red and blue light could enhance growth while maintaining the nutritional quality in lettuce.
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Claims 4
Claim · model-written summary
Alternating red and blue light accelerated lettuce growth significantly compared with white fluorescent lamps or red and blue LEDs at the same daily light integral.
- Taxon
- Lettuce
Lactuca sativat0 - Treatment
- alternating red and blue lighte1
- Outcome
- plant growthe1
- Direction
- acceleratede1
- Qualifier
- at the same daily light integrale1
- Comparator
- white fluorescent lamps or red and blue LEDse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Continuous Irradiation with Alternating Red and Blue Light Enhances Plant Growth While Keeping Nutritional Quality in Lettuce”
e1“alternating red and blue light accelerated plant growth significantly compared with white fluorescent lamps or red and blue LEDs at the same daily light integral”
Claim · model-written summary
Lettuce under alternating red/blue light had a greater net assimilation rate than other plants.
- Taxon
- LettuceLactuca sativat0
- Treatment
- alternating red/blue lighte2
- Outcome
- net assimilation ratee2
- Direction
- greatere2
- Comparator
- other plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Continuous Irradiation with Alternating Red and Blue Light Enhances Plant Growth While Keeping Nutritional Quality in Lettuce”
e2“Plants grown under alternating red/blue light had a greater net assimilation rate and total and projected leaf area (an indicator of the fraction of leaf area that absorbs more light) than other plants”
Claim · model-written summary
Lettuce under alternating red/blue light had greater total and projected leaf area than other plants.
- Taxon
- LettuceLactuca sativat0
- Treatment
- alternating red/blue lighte2
- Outcome
- total and projected leaf areae2
- Direction
- greatere2
- Comparator
- other plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Continuous Irradiation with Alternating Red and Blue Light Enhances Plant Growth While Keeping Nutritional Quality in Lettuce”
e2“Plants grown under alternating red/blue light had a greater net assimilation rate and total and projected leaf area (an indicator of the fraction of leaf area that absorbs more light) than other plants”
Claim · model-written summary
Alternating red and blue light maintained high concentrations of sugars, ascorbic acid and anthocyanins in lettuce leaves.
- Taxon
- LettuceLactuca sativat0
- Organ / stage
- leavese3
- Treatment
- alternating red and blue lighte3
- Outcome
- concentrations of sugars, ascorbic acid, and anthocyaninse3
- Direction
- maintainede3
- Qualifier
- highe3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Continuous Irradiation with Alternating Red and Blue Light Enhances Plant Growth While Keeping Nutritional Quality in Lettuce”
e3“alternating red and blue light maintained high concentrations of sugars, ascorbic acid, and anthocyanins in leaves”
The same questions in other papers
light · quality: phytochemicals · Lactuca sativa (garden lettuce)Positive and negative results
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- no effect
- negative
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See all 51 papers →light · growth · Lactuca sativa (garden lettuce)Positive and negative results
242 papers in the same direction as this paper · 54 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- positive
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See all 300 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.