Abstract
Light use efficiency characterizes the ability of a crop to convert radiation into biomass. Determining optimum cultivar-specific photosynthetic photon flux density (PPFD) values from sole-source lighting can be used to optimize leaf expansion, maximize biomass, and shorten the production period. This study evaluated the growth of hydroponic lettuce (Lactuca sativa) ‘Rex’ cultivated under different PPFD levels using sole-source lighting. At lower PPFD levels of 201 to 292 µmol·m−2·s−1, the plant projected canopy size (PCS) and specific leaf area increased to enhance light capture by 36.2% as compared to higher PPFD levels (333 and 413 µmol·m−2·s−1), while plants exhibited 10.3% lower canopy overlap ratio and 27.8% lower shoot dry weights. Both low and high PPFD conditions lead to a similar trend in PCS among plants. Light use efficiency was not a major factor in influencing lettuce growth. Instead, the critical factor was the total incident light the plants received. This study showcased the importance of incident light and PPFD on the growth, morphology, and biomass accumulation in lettuce.
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Claims 6
Claim · model-written summary
Low PPFD increased projected canopy size and specific leaf area for light capture by 36.2%.
- Taxon
- lettuce
Lactuca sativat0 - Material
- ‘Rex’e1
- Treatment
- 201 to 292 µmol·m−2·s−1e0
- Outcome
- plant projected canopy size (PCS) and specific leaf areae0
- Direction
- increasede0
- Value
- 36.2%e0
- Comparator
- 333 and 413 µmol·m−2·s−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At lower PPFD levels of 201 to 292 µmol·m−2·s−1, the plant projected canopy size (PCS) and specific leaf area increased to enhance light capture by 36.2% as compared to higher PPFD levels (333 and 413 µmol·m−2·s−1)”
t0“lettuce”
e1“hydroponic lettuce (Lactuca sativa) ‘Rex’ cultivated under different PPFD levels”
Claim · model-written summary
Low PPFD reduced canopy overlap ratio by 10.3%.
- Taxon
- lettuceLactuca sativat0
- Treatment
- lower PPFD levelse1
- Outcome
- canopy overlap ratioe0
- Direction
- lowere0
- Value
- 10.3%e0
- Comparator
- higher PPFD levelse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants exhibited 10.3% lower canopy overlap ratio”
t0“lettuce”
e1“At lower PPFD levels of 201 to 292 µmol·m−2·s−1”
e2“higher PPFD levels (333 and 413 µmol·m−2·s−1)”
Claim · model-written summary
Low PPFD reduced shoot dry weight by 27.8%.
- Taxon
- lettuceLactuca sativat0
- Treatment
- lower PPFD levelse1
- Outcome
- shoot dry weightse0
- Direction
- lowere0
- Value
- 27.8%e0
- Comparator
- higher PPFD levelse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“27.8% lower shoot dry weights”
t0“lettuce”
e1“At lower PPFD levels of 201 to 292 µmol·m−2·s−1”
e2“higher PPFD levels (333 and 413 µmol·m−2·s−1)”
Claim · model-written summary
Low and high PPFD showed a similar projected canopy size trend.
- Taxon
- lettuceLactuca sativat0
- Outcome
- similar trend in PCSe0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both low and high PPFD conditions lead to a similar trend in PCS among plants”
t0“lettuce”
Claim · model-written summary
Light use efficiency was not a major influence on lettuce growth.
- Taxon
- lettuceLactuca sativae0
- Outcome
- lettuce growthe0
- Qualifier
- not a major factore0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Light use efficiency was not a major factor in influencing lettuce growth”
Claim · model-written summary
Total incident light was identified as the critical factor for lettuce growth.
- Taxon
- lettuceLactuca sativat0
- Outcome
- total incident lighte0
- Qualifier
- critical factore0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the critical factor was the total incident light the plants received”
t0“lettuce”
The same questions in other papers
light · growth · Lactuca sativa (garden lettuce)Positive and negative results
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