Abstract
Sixteen adult rose plants ( Rosa hybrida cv. Sweet Promise) were grown in rockwool in a phytotron. Water uptake was estimated by computing the difference between the rate of nutrient solution supply and the rate of leaching, continuously measured using a high‐precision flowmeter. Transpiration was measured using a balance continuously recording the loss of weight in the entire system. Changes in stem diameter were recorded using linear variable differential transducers placed at the base of four developing shoots and on their corresponding basal stems. Changes in stem diameter were related to changes in the water content of 16 plants. The amplitude of shrinkage in daytime stem diameter and daily increase in stem diameter was lower in basal stems. Radial hydraulic resistance to water diffusion in stems seems to be very low and stem reservoirs appear to be very early sensors of water depletion. When the nutrient solution supply was suppressed, the amplitude of the daily increase in stem diameter and transpiration rates were reduced one and one‐and‐a‐half days later, respectively. When water depletion became more severe, stem diameter decreased from one day to another. The amplitude of daily stem shrinkage increased sharply for 6 days after watering was stopped, while the bulk modulus of elasticity of leaves decreased, probably as a result of damage to the cell wall.
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Claims 10
Claim · model-written summary
Stem diameter changes were related to plant water content changes.
Not reportedDirection
Verbatim
e0“Changes in stem diameter were related to changes in the water content of 16 plants.”
t0“rose plants”
Claim · model-written summary
Daytime stem shrinkage amplitude was lower in basal stems.
Verbatim
e0“The amplitude of shrinkage in daytime stem diameter and daily increase in stem diameter was lower in basal stems.”
t0“rose plants”
Claim · model-written summary
Daily stem diameter increase was lower in basal stems.
Verbatim
e0“The amplitude of shrinkage in daytime stem diameter and daily increase in stem diameter was lower in basal stems.”
t0“rose plants”
Claim · model-written summary
Radial hydraulic resistance to water diffusion in stems appeared very low.
Verbatim
e0“Radial hydraulic resistance to water diffusion in stems seems to be very low”
t0“rose plants”
Claim · model-written summary
Stem reservoirs appeared to be early sensors of water depletion.
Verbatim
e0“stem reservoirs appear to be very early sensors of water depletion”
t0“rose plants”
Claim · model-written summary
Suppressing nutrient solution supply reduced daily stem diameter increase one day later.
- Taxon
- rose plantst0
- Treatment
- nutrient solution supply was suppressede0
- Outcome
- amplitude of the daily increase in stem diametere0
- Direction
- reducede0
- Qualifier
- one and one‐and‐a‐half days later, respectivelye0
Not reportedComparator
Verbatim
e0“When the nutrient solution supply was suppressed, the amplitude of the daily increase in stem diameter and transpiration rates were reduced one and one‐and‐a‐half days later, respectively.”
t0“rose plants”
Claim · model-written summary
Suppressing nutrient solution supply reduced transpiration rates one and a half days later.
- Taxon
- rose plantst0
- Treatment
- nutrient solution supply was suppressede0
- Outcome
- transpiration ratese0
- Direction
- reducede0
- Qualifier
- one‐and‐a‐half dayse0
Not reportedComparator
Verbatim
e0“When the nutrient solution supply was suppressed, the amplitude of the daily increase in stem diameter and transpiration rates were reduced one and one‐and‐a‐half days later, respectively.”
t0“rose plants”
Claim · model-written summary
With more severe water depletion, stem diameter decreased from day to day.
Verbatim
e0“When water depletion became more severe, stem diameter decreased from one day to another.”
t0“rose plants”
Claim · model-written summary
Daily stem shrinkage amplitude increased sharply for six days after watering stopped.
- Taxon
- rose plantst0
- Treatment
- watering was stoppede0
- Outcome
- amplitude of daily stem shrinkagee0
- Direction
- increased sharplye0
- Value
- 6 dayse0
Not reportedComparator
Verbatim
e0“The amplitude of daily stem shrinkage increased sharply for 6 days after watering was stopped”
t0“rose plants”
Claim · model-written summary
Leaf bulk modulus of elasticity decreased after watering stopped.
- Taxon
- rose plantst0
- Outcome
- bulk modulus of elasticity of leavese0
- Direction
- decreasede0
- Qualifier
- probably as a result of damage to the cell walle0
Not reportedTreatmentComparator
Verbatim
e0“while the bulk modulus of elasticity of leaves decreased, probably as a result of damage to the cell wall.”
t0“rose plants”
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