Abstract
Abstract: Especially in an open crop (e.g., young plants) morphological responses to light quality can affect light interception, crop photosynthesis and growth. Earlier work showed a substantial morphology related biomass increase for young cucumber plants grown under 100% artificial sunlight (ASL) compared with 100% high pressure sodium light (HPS). Here, ASL is used to investigate the effect of HPS and LEDs compared with ASL, when applied supplemental to an ASL background. Tomato plants were grown in a climate room under 17 h ASL (50% of in total 200 µmol PAR m-2 s-1) supplemented with 50% HPS, light emitting diodes LEDs (red/blue), or ASL. The 100% ASL-grown plants produced 32-45% more dry weight, due to a more efficient light interception. As ASL lamps are not energy-efficient enough for commercial production we tried to simplify the solar spectrum while retaining enhanced crop productivity in greenhouses. Red/blue/far-red LEDs, at a ratio inducing the same phytochrome photostationary state (PSS) as natural sunlight, and sulphur-plasma lamps, emitting a continuous spectrum in the PAR-region, were tested and compared with supplemental red/blue LEDs, HPS and ASL in a greenhouse experiment. Red/blue/far-red LEDs resulted in a visual appearance similar to the ASL-plants, while red/blue LEDs produced the most compact morphology. Red/blue/far-red LEDs enhanced dry weight for cucumber (+21%) and tomato (+15%) compared with HPS. Dry weight and compactness were intermediate for sulphur-plasma. The differences were attributable to effects of leaf orientation and positioning on light interception, and not to photosynthesis per unit leaf area. The PSS appears to be a key-factor to control crop morphology, providing a tool to induce ‘sunlight’ crop characteristics to enhance productivity.
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Claims 7
Claim · model-written summary
Under full artificial sunlight, tomato plants produced 32-45% more dry weight through improved light interception.
- Taxon
- Tomato
Solanum lycopersicume1 - Treatment
- 100% ASLe0
- Outcome
- dry weighte0
- Direction
- moree0
- Value
- 32-45%e0
- Qualifier
- more efficient light interceptione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 100% ASL-grown plants produced 32-45% more dry weight, due to a more efficient light interception”
e1“Tomato plants were grown in a climate room”
Claim · model-written summary
Red/blue/far-red LEDs gave crops a visual appearance similar to artificial sunlight.
Not reportedTaxon
Verbatim
e0“Red/blue/far-red LEDs resulted in a visual appearance similar to the ASL-plants”
Claim · model-written summary
Red/blue LEDs produced the most compact crop morphology.
Not reportedTaxonComparator
Verbatim
e0“red/blue LEDs produced the most compact morphology”
Claim · model-written summary
Red/blue/far-red LEDs raised cucumber dry weight by 21% versus HPS.
- Taxon
- cucumber
Cucumis sativuse0 - Treatment
- Red/blue/far-red LEDse0
- Outcome
- dry weighte0
- Direction
- enhancede0
- Value
- +21%e0
- Comparator
- HPSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Red/blue/far-red LEDs enhanced dry weight for cucumber (+21%) and tomato (+15%) compared with HPS”
Claim · model-written summary
Red/blue/far-red LEDs raised tomato dry weight by 15% versus HPS.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- Red/blue/far-red LEDse0
- Outcome
- dry weighte0
- Direction
- enhancede0
- Value
- +15%e0
- Comparator
- HPSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Red/blue/far-red LEDs enhanced dry weight for cucumber (+21%) and tomato (+15%) compared with HPS”
Claim · model-written summary
Sulphur-plasma light yielded intermediate dry weight and compactness.
Not reportedTaxonComparator
Verbatim
e0“Dry weight and compactness were intermediate for sulphur-plasma”
Claim · model-written summary
Light interception differences were attributed to leaf orientation and positioning.
Not reportedTaxon
Verbatim
e0“differences were attributable to effects of leaf orientation and positioning on light interception”
The same questions in other papers
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- negative
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See all 226 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.