Abstract
), far-red light (700-800 nm) is integral to initiating shade responses which can increase plant growth. In the first of two studies, plants were grown with a similar photosynthetic photon flux density (PPFD) but different intensities of far-red light. The second study used perpendicular gradients of far-red light and PPFD, allowing for examination of interactive effects. The far-red gradient study revealed that increasing supplemental far-red light increased leaf length and width, which was associated with increased projected canopy size (PCS). The higher PCS was associated with increased cumulative incident light received by plants, which increased dry matter accumulation. In the perpendicular gradient study, far-red light was 57% and 183% more effective at increasing the amount of light received by the plant, as well as 92.5% and 162% more effective at increasing plant biomass at the early and late harvests, respectively, as compared to PPFD. Light use efficiency (LUE, biomass/mol incident light) was generally negatively correlated with specific leaf area (SLA). Far-red light provided by LEDs increases the canopy size to capture more light to drive photosynthesis and shows promise for inclusion in the growth light spectrum for lettuce under sole-source lighting.
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Claims 6
Claim · model-written summary
Increasing far-red light increased lettuce leaf length and width.
- Taxon
- Lettuce
Lactuca sativat0 - Treatment
- supplemental far-red lighte0
- Outcome
- leaf length and widthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing supplemental far-red light increased leaf length and width”
t0“Lettuce”
Claim · model-written summary
Greater leaf dimensions were associated with greater projected canopy size.
- Taxon
- LettuceLactuca sativat0
- Organ / stage
- leafe0
- Outcome
- projected canopy size (PCS)e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased leaf length and width, which was associated with increased projected canopy size (PCS)”
t0“Lettuce”
Claim · model-written summary
Higher projected canopy size was associated with more cumulative incident light and dry matter accumulation.
- Taxon
- LettuceLactuca sativat0
- Outcome
- cumulative incident lighte0
- Direction
- increasede0
- Qualifier
- dry matter accumulatione0
- Comparator
- PCSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher PCS was associated with increased cumulative incident light received by plants, which increased dry matter accumulation.”
t0“Lettuce”
Claim · model-written summary
At early and late harvests, far-red light was 57% and 183% more effective than PPFD at increasing received light.
- Taxon
- LettuceLactuca sativat0
- Treatment
- far-red lighte0
- Outcome
- amount of light received by the plante0
- Direction
- increasinge0
- Value
- 57% and 183%e0
- Comparator
- PPFDe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“far-red light was 57% and 183% more effective at increasing the amount of light received by the plant”
e1“as compared to PPFD”
t0“Lettuce”
Claim · model-written summary
At early and late harvests, far-red light was 92.5% and 162% more effective than PPFD at increasing biomass.
- Taxon
- LettuceLactuca sativat0
- Outcome
- plant biomasse0
- Direction
- increasinge0
- Value
- 92.5% and 162%e0
- Comparator
- PPFDe0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“92.5% and 162% more effective at increasing plant biomass at the early and late harvests, respectively, as compared to PPFD”
t0“Lettuce”
Claim · model-written summary
Light use efficiency was generally negatively correlated with specific leaf area.
- Taxon
- LettuceLactuca sativat0
- Organ / stage
- specific leaf areae0
- Outcome
- Light use efficiencye0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Light use efficiency (LUE, biomass/mol incident light) was generally negatively correlated with specific leaf area (SLA).”
t0“Lettuce”
The same questions in other 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
- negative
- no effect
296 papers more in this group
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.