Claim · model-written summary
For low temperatures, light intensities of 350 to 500 μmol m-2 s-1 are recommended for production, with 350 optimal as supplementary greenhouse light in early spring and winter.
- Taxon
- lettuce
Lactuca sativae0 - Outcome
- light intensities of 350 to 500 μmol·m −2 ·s −1 are recommendede1
- Qualifier
- optimal supplementary light during early spring and winter in greenhousese1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for producing the lettuce Lactuca sativa L”
e1“for low temperatures, light intensities of 350 to 500 μmol·m −2 ·s −1 are recommended for production, and an intensity of 350 μmol·m −2 ·s −1 provides optimal supplementary light during early spring and winter in greenhouses”
Title
Jing Zhou; PingPing Li; JiZhang Wang; et al. HortScience 2019. doi:10.21273/hortsci14161-19
Other claims from this paper (19)
- Intervention effect At low temperature, effective quantum yield of PSII, net photosynthetic rate and stomatal conductance were highest at 350 μmol m-2 s-1, followed by 500 μmol m-2 s-1.
- Intervention effect At low temperature, transpiration rate was highest at 350 μmol m-2 s-1, followed by 500 μmol m-2 s-1.
- Intervention effect At low temperature, N, K and P uptake were highest at 350 μmol m-2 s-1, followed by 500 μmol m-2 s-1.
- Association At low temperature, 350 μmol m-2 s-1 (followed by 500) gave higher leaf number, leaf area, dry weight and fresh weight of lettuce.
- Intervention effect At medium temperature, photosystem II quantum yield, net photosynthetic rate and stomatal conductance were higher at 350, 500 and 600 μmol m-2 s-1 than at other light intensities.
- Intervention effect At medium temperature, transpiration rate was higher at 350, 500 and 600 μmol m-2 s-1 than at other light intensities.
- Intervention effect At medium temperature, N, K and P uptake were higher at 350, 500 and 600 μmol m-2 s-1 than at other light intensities.
- Intervention effect At medium temperature, leaf number, leaf area and fresh weight of lettuce were highest at 500 μmol m-2 s-1.
- Intervention effect At medium temperature, dry weight of lettuce was highest at 600 μmol m-2 s-1.
- Intervention effect At high temperature, Fv/Fm, photosystem II quantum yield and net photosynthetic rate were highest at 500 μmol m-2 s-1.
- Intervention effect At high temperature, stomatal conductance and transpiration rate were highest at 500 μmol m-2 s-1.
- Intervention effect At high temperature, N, K and P uptake were highest at 500 μmol m-2 s-1.
- Intervention effect At high temperature, leaf number, leaf area and fresh weight of lettuce were highest at 600 μmol m-2 s-1.
- Intervention effect At high temperature, dry weight of lettuce was highest at 600 μmol m-2 s-1.
- Observation Fv/Fm indicated that lettuce was under stress at 600 μmol m-2 s-1 at low temperature.
- Observation Fv/Fm indicated that lettuce was under stress at 100 μmol m-2 s-1 at medium temperature.
- Observation Fv/Fm indicated that lettuce was under stress at 100-350 μmol m-2 s-1 at high temperature.
- Recommendation For medium temperatures, light intensities of 350 to 600 μmol m-2 s-1 are recommended, with 500 optimal in mid spring and autumn.
- Recommendation For high temperatures, light intensities of 500 to 600 μmol m-2 s-1 are recommended, with 600 optimal in late spring and early autumn.