Abstract
Summary Light-emitting diodes (LED) allow narrow-band light to be easily obtained and can be used for narrow-band lighting in plant cultivation, with possible effects on plant growth and development. This study examined use of narrow-band lighting of different wavelengths in the cultivation of ornamental pot plant ( Pelargonium and Petunia ), tomato ( Solanum lycopersicum ) transplants and sunflower ( Helianthus annuus ), either as sole light source in growth chambers, or as end-of-day (EOD) treatment in a greenhouse environment. Biometric measurements on plant growth and measurements of photosynthesis and stomatal conductance showed that when Helianthus was grown exclusively in blue light, stem elongation was greater than when it was grown exclusively in yellow, red, green or white light. Similar results were obtained when blue light was supplied in EOD treatments for Petunia and Pelargonium and for tomato. However, stem elongation was also high when red light was given as EOD treatment to tomato, whereas green light gave the least elongated plants in these conditions. Biomass production was generally not affected by the different EOD treatments. For Helianthus plants grown solely in monochromatic light, plant biomass production was highest in red light. For Pelargonium , photosynthetic rate was highest in blue light. It was concluded that plant response to different wavelengths is species-dependent and that EOD treatment with narrow-band lighting might be useful for plant growth regulation.
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Claims 11
Claim · model-written summary
Blue light alone produced greater Helianthus stem elongation than yellow, red, green or white light.
- Taxon
- Helianthus
Helianthuse0 - Treatment
- blue lighte0
- Outcome
- stem elongatione0
- Direction
- greatere0
- Comparator
- yellow, red, green or white lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when Helianthus was grown exclusively in blue light, stem elongation was greater than when it was grown exclusively in yellow, red, green or white light”
Claim · model-written summary
Blue end-of-day light increased stem elongation of Petunia.
_flowers_in_Westgate_Gardens%2C_Canterbury.jpg?width=60){kind=small}
PetuniaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_flowers_in_Westgate_Gardens%2C_Canterbury.jpg?width=500)
Verbatim
e0“blue light was supplied in EOD treatments for Petunia and Pelargonium and for tomato”
e1“Similar results were obtained”
e2“stem elongation was greater”
Claim · model-written summary
Blue end-of-day light increased stem elongation of Pelargonium.
- Taxon
- Pelargonium
.jpg?width=60)
Pelargoniume0 - Treatment
- blue lighte0
- Outcome
- stem elongatione1
- Direction
- greatere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“blue light was supplied in EOD treatments for Petunia and Pelargonium and for tomato”
e1“stem elongation was greater”
Claim · model-written summary
Blue end-of-day light increased tomato stem elongation.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- blue lighte0
- Outcome
- stem elongatione1
- Direction
- greatere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“blue light was supplied in EOD treatments for Petunia and Pelargonium and for tomato”
e1“stem elongation was greater”
Claim · model-written summary
Red end-of-day light also produced high tomato stem elongation.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- red lighte0
- Outcome
- stem elongatione0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stem elongation was also high when red light was given as EOD treatment to tomato”
Claim · model-written summary
Green end-of-day light produced the least elongated tomato plants.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- green lighte0
- Outcome
- elongated plantse0
- Direction
- leaste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“green light gave the least elongated plants in these conditions”
e1“EOD treatment to tomato”
Claim · model-written summary
End-of-day light treatments generally did not affect biomass production.
- Taxon
- Petunia and Pelargonium and for tomatoe1
- Treatment
- different EOD treatmentse0
- Outcome
- Biomass productione0
- Direction
- not affectede0
Not reportedComparator
Verbatim
e0“Biomass production was generally not affected by the different EOD treatments”
e1“Petunia and Pelargonium and for tomato”
Claim · model-written summary
Helianthus grown only in monochromatic red light had the highest biomass production.
- Taxon
- HelianthusHelianthuse0
- Treatment
- red lighte0
- Outcome
- plant biomass productione0
- Direction
- higheste0
- Comparator
- monochromatic lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For Helianthus plants grown solely in monochromatic light, plant biomass production was highest in red light”
Claim · model-written summary
Pelargonium had the highest photosynthetic rate in blue light.
- Taxon
- PelargoniumPelargoniume0
- Treatment
- blue lighte0
- Outcome
- photosynthetic ratee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For Pelargonium , photosynthetic rate was highest in blue light”
Claim · model-written summary
The authors concluded that wavelength responses depend on plant species.
Verbatim
e0“plant response to different wavelengths is species-dependent”
e1“Pelargonium and Petunia”
t0“horticultural plants”
Claim · model-written summary
The authors suggested end-of-day narrow-band lighting for growth regulation.
Verbatim
e0“EOD treatment with narrow-band lighting might be useful for plant growth regulation”
t0“horticultural plants”
The same questions in other papers
light · growth · Helianthus (sunflowers)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
1 paper more in this group
See all 5 papers →light · growth · PelargoniumPositive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
1 paper more in this group
See all 5 papers →light · growth · Petunia (petunia)Positive and negative results
19 papers in the same direction as this paper · 4 in the opposite direction
- negative
- negative
- negative
20 papers more in this group
See all 24 papers →light · growth · Solanum lycopersicum (tomato)Positive and negative results
154 papers in the same direction as this paper · 66 in the opposite direction · 5 reporting no difference from an alternative
- negative
- negative
- negative
222 papers more in this group
See all 226 papers →light · physiology: photosynthesis · PelargoniumResults agree
1 paper in the same direction as this paper
- positive
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.