Abstract
With the rise of plant factories around the world, more and more crops are cultivated under artificial light. Studies on effects of lighting strategies on plant growth, such as different light intensities, photoperiods, and their combinations, have been widely conducted. However, research on application of multi-segment light strategies and associated plant growth mechanisms is still relatively lacking. In the present study, two lighting strategies, multi-segment light intensity and extended photoperiod, were compared with a constant light intensity with a 12 h light/12 h dark cycle and the same daily light integral (DLI). Both lighting strategies promoted plant growth but acted via different mechanisms. The multi-segment light intensity lighting strategy promoted plant growth by decreasing non-photochemical quenching (NPQ) of the excited state of chlorophyll and increasing the quantum yield of PSII electron transport (PhiPSII), quantum yield of the carboxylation rate (PhiCO2), and photochemical quenching (qP), also taking advantage of the circadian rhythm. The extended photoperiod lighting strategy promoted plant growth by compensating for weak light stress and increasing light-use efficiency by increasing chlorophyll content under weak light conditions.
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Claims 6
Claim · model-written summary
The multi-segment light intensity strategy promoted lettuce growth compared with constant light intensity at the same daily light integral.
- Taxon
- Lactuca sativa L.
Lactuca sativat0 - Treatment
- multi-segment light intensitye0
- Outcome
- plant growthe1
- Direction
- promotede1
- Comparator
- constant light intensity with a 12 h light/12 h dark cyclee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“two lighting strategies, multi-segment light intensity and extended photoperiod, were compared with a constant light intensity with a 12 h light/12 h dark cycle and the same daily light integral (DLI)”
e1“Both lighting strategies promoted plant growth”
Claim · model-written summary
The extended photoperiod strategy promoted lettuce growth compared with constant light intensity at the same daily light integral.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- extended photoperiode0
- Outcome
- plant growthe1
- Direction
- promotede1
- Comparator
- constant light intensity with a 12 h light/12 h dark cyclee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“two lighting strategies, multi-segment light intensity and extended photoperiod, were compared with a constant light intensity with a 12 h light/12 h dark cycle and the same daily light integral (DLI)”
e1“Both lighting strategies promoted plant growth”
Claim · model-written summary
The multi-segment light intensity strategy decreased non-photochemical quenching (NPQ) of the excited state of chlorophyll.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- multi-segment light intensitye1
- Outcome
- non-photochemical quenching (NPQ)e1
- Direction
- decreasinge1
- Comparator
- constant light intensity with a 12 h light/12 h dark cyclee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“two lighting strategies, multi-segment light intensity and extended photoperiod, were compared with a constant light intensity with a 12 h light/12 h dark cycle and the same daily light integral (DLI)”
e1“The multi-segment light intensity lighting strategy promoted plant growth by decreasing non-photochemical quenching (NPQ) of the excited state of chlorophyll and increasing the quantum yield of PSII electron transport (PhiPSII), quantum yield of the carboxylation rate (PhiCO2), and photochemical quenching (qP)”
Claim · model-written summary
The multi-segment light intensity strategy increased the quantum yield of PSII electron transport, the quantum yield of the carboxylation rate and photochemical quenching.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- multi-segment light intensitye1
- Outcome
- quantum yield of PSII electron transport (PhiPSII), quantum yield of the carboxylation rate (PhiCO2), and photochemical quenching (qP)e1
- Direction
- increasinge1
- Comparator
- constant light intensity with a 12 h light/12 h dark cyclee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“two lighting strategies, multi-segment light intensity and extended photoperiod, were compared with a constant light intensity with a 12 h light/12 h dark cycle and the same daily light integral (DLI)”
e1“The multi-segment light intensity lighting strategy promoted plant growth by decreasing non-photochemical quenching (NPQ) of the excited state of chlorophyll and increasing the quantum yield of PSII electron transport (PhiPSII), quantum yield of the carboxylation rate (PhiCO2), and photochemical quenching (qP)”
Claim · model-written summary
The extended photoperiod strategy promoted growth by compensating for weak light stress.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- extended photoperiod lighting strategye0
- Outcome
- plant growthe0
- Qualifier
- compensating for weak light stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“The extended photoperiod lighting strategy promoted plant growth by compensating for weak light stress”
Claim · model-written summary
The extended photoperiod strategy increased light-use efficiency by increasing chlorophyll content under weak light conditions.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Outcome
- light-use efficiencye0
- Qualifier
- increasing chlorophyll content under weak light conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lactuca sativa L.”
e0“increasing light-use efficiency by increasing chlorophyll content under weak light conditions”
The same questions in other papers
light · physiology: photosynthesis · Lactuca sativa (garden lettuce)Positive and negative results
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- positive
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242 papers in the same direction as this paper · 54 in the opposite direction · 3 reporting no difference from an alternative
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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.