Abstract
Effects of six different proportions of red and blue light of LED(light emitting diode) on seedling quality in multilayer system were studied. Two out of six proportions were selected to determine their impact on tobacco plant growth and tobacco leaf yield and quality. Results showed that light intensity had an enhanced trend with increase of proportion of blue light. The seedling rate under four proportions of red and blue light(1:1, 1:2, 1:3 and 1:4) was significantly higher than that under natural light. Dry matter accumulation was high, but seedling quality was similar to natural light. Chlorophyll content under LED light was significantly higher than that under natural light, but root activity under LED light was significantly lower. In addition, root activity under red and blue light with proportions of 1:1 and 1:4 was significantly stronger than that with other proportions. Tobacco plants with LED light treatment grew slow in root extending stage, and grew faster afterwards, and showed no significant difference with those under natural light treatment at maturing stage. The economic characters and chemical compositions of tobacco leaves under LED light treatments showed no significant difference with those under natural light. It is concluded that red and blue light with proportions of 1:1 and 1:4 could increase seedling rate and chlorophyll content of seedling leaves, and promote accumulation of dry matter.
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Claims 10
Claim · model-written summary
Light intensity increased as blue light proportion increased.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- proportion of blue lighte0
- Outcome
- light intensitye0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light intensity had an enhanced trend with increase of proportion of blue light.”
t0“tobacco”
Claim · model-written summary
Four red and blue light proportions significantly increased seedling rate over natural light.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- four proportions of red and blue light(1:1, 1:2, 1:3 and 1:4)e0
- Outcome
- seedling ratee0
- Direction
- highere0
- Comparator
- natural lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The seedling rate under four proportions of red and blue light(1:1, 1:2, 1:3 and 1:4) was significantly higher than that under natural light.”
t0“tobacco”
Claim · model-written summary
Dry matter accumulation was high under the studied light proportions.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- Dry matter accumulatione0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter accumulation was high”
t0“tobacco”
Claim · model-written summary
Seedling quality was similar to natural light.
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- seedling qualitye0
- Direction
- similare0
- Comparator
- natural lighte0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedling quality was similar to natural light.”
t0“tobacco”
Claim · model-written summary
LED light significantly raised chlorophyll content over natural light.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- LED lighte0
- Outcome
- Chlorophyll contente0
- Direction
- highere0
- Comparator
- natural lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll content under LED light was significantly higher than that under natural light”
t0“tobacco”
Claim · model-written summary
LED light significantly reduced root activity relative to natural light.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- LED lighte0
- Outcome
- root activitye0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root activity under LED light was significantly lower.”
t0“tobacco”
Claim · model-written summary
Root activity was significantly stronger at 1:1 and 1:4 than at other proportions.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- red and blue light with proportions of 1:1 and 1:4e0
- Outcome
- root activitye0
- Direction
- strongere0
- Comparator
- other proportionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root activity under red and blue light with proportions of 1:1 and 1:4 was significantly stronger than that with other proportions.”
t0“tobacco”
Claim · model-written summary
LED treated tobacco grew slowly during root extension and faster afterward.
- Taxon
- TobaccoNicotiana tabacume0
- Organ / stage
- root extending stagee0
- Treatment
- LED light treatmente0
- Outcome
- grew slow in root extending stage, and grew faster afterwardse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tobacco plants with LED light treatment grew slow in root extending stage, and grew faster afterwards”
Claim · model-written summary
Mature LED treated tobacco did not significantly differ from natural light plants.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- maturing stagee0
- Treatment
- LED light treatmente0
- Outcome
- no significant differencee0
- Direction
- no significant differencee0
- Comparator
- natural light treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tobacco plants with LED light treatment grew slow in root extending stage, and grew faster afterwards, and showed no significant difference with those under natural light treatment at maturing stage.”
t0“tobacco”
Claim · model-written summary
Leaf economic characters and chemical compositions did not differ significantly under LED light.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- LED light treatmentse0
- Outcome
- economic characters and chemical compositions of tobacco leavese0
- Direction
- no significant differencee0
- Comparator
- natural lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The economic characters and chemical compositions of tobacco leaves under LED light treatments showed no significant difference with those under natural light.”
The same questions in other papers
light · organism · Nicotiana tabacum (tobacco)Positive and negative results
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- positive
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28 papers in the same direction as this paper · 16 in the opposite direction · 2 reporting no difference from an alternative
- no effect
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- negative
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See all 47 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.