Abstract
Low temperatures (3–10 °C) for 1 h to 6 days increased leaf diffusion resistance (r 1 ) of Ulmus americana and Fraxinus pennsylvanica seedlings, indicating rapid stomatal closure. The change in r 1 increased as the temperature was lowered over a range of 10–3 °C. After cessation of cold-stress treatment, r 1 values recovered within 1 day to prestress levels. No significant differences were found in speed of recovery of r 1 in plants after exposure to cold over a range of 3– 10 °C. Stomatal closure could account thus for at least part of the decrease in photosynthesis at low temperatures.
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Claims 6
Claim · model-written summary
Low temperatures increased leaf diffusion resistance in Ulmus americana seedlings.
- Taxon
- Ulmus americana
Ulmus americanae0 - Treatment
- Low temperatures (3–10 °C) for 1 h to 6 dayse0
- Outcome
- leaf diffusion resistance (r 1 )e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low temperatures (3–10 °C) for 1 h to 6 days increased leaf diffusion resistance (r 1 ) of Ulmus americana and Fraxinus pennsylvanica seedlings”
Claim · model-written summary
Low temperatures increased leaf diffusion resistance in Fraxinus pennsylvanica seedlings.
- Taxon
- Fraxinus pennsylvanica
Fraxinus pennsylvanicae0 - Treatment
- Low temperatures (3–10 °C) for 1 h to 6 dayse0
- Outcome
- leaf diffusion resistance (r 1 )e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low temperatures (3–10 °C) for 1 h to 6 days increased leaf diffusion resistance (r 1 ) of Ulmus americana and Fraxinus pennsylvanica seedlings”
Claim · model-written summary
The diffusion-resistance change increased as temperature fell from 10 to 3 °C.
- Taxon
- Ulmus americana and Fraxinus pennsylvanicaUlmus americanaFraxinus pennsylvanicat0
- Treatment
- temperature was lowered over a range of 10–3 °Ce0
- Outcome
- change in r 1e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The change in r 1 increased as the temperature was lowered over a range of 10–3 °C”
t0“Ulmus americana and Fraxinus pennsylvanica”
Claim · model-written summary
Leaf diffusion resistance recovered to prestress levels within one day after cold stress ended.
- Taxon
- Ulmus americana and Fraxinus pennsylvanicaUlmus americanaFraxinus pennsylvanicat0
- Outcome
- r 1 valuese0
- Direction
- recoverede0
- Value
- 1 daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After cessation of cold-stress treatment, r 1 values recovered within 1 day to prestress levels”
t0“Ulmus americana and Fraxinus pennsylvanica”
Claim · model-written summary
Recovery speed did not differ significantly across exposure temperatures of 3 to 10 °C.
- Taxon
- Ulmus americana and Fraxinus pennsylvanicaUlmus americanaFraxinus pennsylvanicat0
- Treatment
- cold over a range of 3– 10 °Ce0
- Outcome
- speed of recovery of r 1e0
- Direction
- No significant differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant differences were found in speed of recovery of r 1 in plants after exposure to cold over a range of 3– 10 °C”
t0“Ulmus americana and Fraxinus pennsylvanica”
Claim · model-written summary
The authors suggest stomatal closure partly explains reduced photosynthesis at low temperature.
- Taxon
- Ulmus americana and Fraxinus pennsylvanicaUlmus americanaFraxinus pennsylvanicat0
- Outcome
- decrease in photosynthesise0
- Direction
- decreasee0
- Qualifier
- Stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal closure could account thus for at least part of the decrease in photosynthesis at low temperatures”
t0“Ulmus americana and Fraxinus pennsylvanica”