Abstract
To examine growth conditions that can increase the critical dietary mineral zinc in leaves of baby leaf red oak lettuce, we investigated zinc accumulation under various conditions, including different zinc concentrations in nutrient solution, wind speeds, and root zone temperatures. A high zinc concentration in the nutrient solution led to greatly increased leaf zinc concentration, but also decreased fresh and dry weights of shoots. In addition, necrosis was observed in leaves at a zinc concentration in the nutrient solution of ≥0.15 mM. By contrast, high wind speed and root zone temperature led to increases in leaf zinc concentration, but slightly decreased fresh and dry weights of shoots. In addition, under high wind speed and root zone temperature, no leaf necrosis was observed. The increase in leaf zinc concentration was attributed to increases in zinc absorption, accompanied by increased transpiration, because water absorption rates increased with wind speed and root zone temperature. Therefore, baby leaf red oak lettuce with high leaf zinc concentration can be produced by increasing wind speed and root zone temperature.
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Claims 9
Claim · model-written summary
High nutrient-solution zinc increased leaf zinc concentration.
- Taxon
- baby leaf lettucet0
- Treatment
- high zinc concentration in the nutrient solutione0
- Outcome
- leaf zinc concentratione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“A high zinc concentration in the nutrient solution led to greatly increased leaf zinc concentration, but also decreased fresh and dry weights of shoots.”
t0“baby leaf lettuce”
Claim · model-written summary
High nutrient-solution zinc decreased shoot fresh and dry weights.
- Taxon
- baby leaf lettucet0
- Treatment
- high zinc concentration in the nutrient solutione0
- Outcome
- fresh and dry weights of shootse0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“A high zinc concentration in the nutrient solution led to greatly increased leaf zinc concentration, but also decreased fresh and dry weights of shoots.”
t0“baby leaf lettuce”
Claim · model-written summary
Leaf necrosis occurred at nutrient-solution zinc of at least 0.15 mM.
Verbatim
e0“necrosis was observed in leaves at a zinc concentration in the nutrient solution of ≥0.15 mM.”
t0“baby leaf lettuce”
Claim · model-written summary
High wind speed and root-zone temperature increased leaf zinc concentration.
- Taxon
- baby leaf lettucet0
- Treatment
- high wind speed and root zone temperaturee0
- Outcome
- leaf zinc concentratione0
- Direction
- increasese0
Not reportedComparator
Verbatim
e0“high wind speed and root zone temperature led to increases in leaf zinc concentration, but slightly decreased fresh and dry weights of shoots.”
t0“baby leaf lettuce”
Claim · model-written summary
High wind speed and root-zone temperature slightly decreased shoot fresh and dry weights.
- Taxon
- baby leaf lettucet0
- Treatment
- high wind speed and root zone temperaturee0
- Outcome
- fresh and dry weights of shootse0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“high wind speed and root zone temperature led to increases in leaf zinc concentration, but slightly decreased fresh and dry weights of shoots.”
t0“baby leaf lettuce”
Claim · model-written summary
High wind speed and root-zone temperature did not cause observed leaf necrosis.
Verbatim
e0“under high wind speed and root zone temperature, no leaf necrosis was observed.”
t0“baby leaf lettuce”
Claim · model-written summary
Wind speed and root temperature increased water absorption rates.
- Taxon
- baby leaf lettucet0
- Treatment
- wind speed and root zone temperaturee0
- Outcome
- water absorption ratese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“water absorption rates increased with wind speed and root zone temperature.”
t0“baby leaf lettuce”
Claim · model-written summary
Authors attribute leaf zinc accumulation to increased zinc absorption and transpiration.
Verbatim
e0“The increase in leaf zinc concentration was attributed to increases in zinc absorption, accompanied by increased transpiration”
t0“baby leaf lettuce”
Claim · model-written summary
Authors conclude that increasing wind speed and root-zone temperature can produce lettuce with high leaf zinc.
Verbatim
e0“baby leaf red oak lettuce with high leaf zinc concentration can be produced by increasing wind speed and root zone temperature.”
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