Abstract
Light-emitting diodes (LEDs) with high-intensity output are being studied as a photosynthetic light source for plants. High-output LEDs have peak emission at approximately 660 nm concentrated in a waveband of +/- 30 nm. Lettuce (Lactuca sativa Grand Rapids') seedlings developed extended hypocotyls and elongated cotyledons when grown under these LEDs as a sole source of irradiance. This extension and elongation was prevented when the red LED radiation was supplemented with more than 15 micromoles m-2 s-1 of 400- to 500-nm photons from blue fluorescent lamps. Blue radiation effects were independent of the photon level of the red radiation.
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Claims 3
Claim · model-written summary
Lettuce seedlings grown under red LEDs as the sole irradiance source developed extended hypocotyls and elongated cotyledons.
- Taxon
- Lactuca sativa
Lactuca sativae1 - Treatment
- LEDs as a sole source of irradiancee1
- Outcome
- extended hypocotyls and elongated cotyledonse1
- Direction
- increaseinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lettuce (Lactuca sativa Grand Rapids') seedlings developed extended hypocotyls and elongated cotyledons when grown under these LEDs as a sole source of irradiance”
Claim · model-written summary
Supplementing red LED radiation with more than 15 micromoles m-2 s-1 of 400- to 500-nm blue photons prevented the extension and elongation of lettuce seedlings.
- Taxon
- Lactuca sativaLactuca sativae1
- Treatment
- 400- to 500-nm photons from blue fluorescent lampse2
- Outcome
- extension and elongatione2
- Direction
- preventede2
- Value
- more than 15 micromoles m-2 s-1e2
- Comparator
- red LED radiatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lettuce (Lactuca sativa Grand Rapids') seedlings developed extended hypocotyls and elongated cotyledons when grown under these LEDs as a sole source of irradiance”
e2“This extension and elongation was prevented when the red LED radiation was supplemented with more than 15 micromoles m-2 s-1 of 400- to 500-nm photons from blue fluorescent lamps”
Claim · model-written summary
The effects of blue radiation on lettuce seedlings were independent of the photon level of the red radiation.
- Taxon
- Lactuca sativaLactuca sativae1
- Treatment
- Blue radiatione3
- Outcome
- Blue radiation effectse3
- Direction
- no_changeinferrede3
- Comparator
- photon level of the red radiatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Lettuce (Lactuca sativa Grand Rapids') seedlings developed extended hypocotyls and elongated cotyledons when grown under these LEDs as a sole source of irradiance”
e3“Blue radiation effects were independent of the photon level of the red radiation”
The same questions in other papers
photon · growth · Lactuca sativa (garden lettuce)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
4 papers more in this group
See all 8 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.