Claim · model-written summary
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.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- 350 μmol·m −2 ·s −1e1
- Outcome
- effective quantum yield of photosystem II photochemistry (Φ PSII ), net photosynthetic rate ( P n ), stomatal conductance ( g S )e1
- Direction
- higheste1
- Qualifier
- at a low temperaturee1
- Comparator
- 500 μmol·m −2 ·s −1e2
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for producing the lettuce Lactuca sativa L”
e1“at a low temperature, the values of effective quantum yield of photosystem II photochemistry (Φ PSII ), net photosynthetic rate ( P n ), stomatal conductance ( g S ), and transpiration rate ( T r ) —as well as those of N, K, and P uptake—were the highest at 350 μmol·m −2 ·s −1”
e2“followed by 500 μmol·m −2 ·s −1 , which resulted in higher values for leaf number (LN), leaf area (LA), dry weight (DW), and fresh weight (FW)”
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, 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 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.
- 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.