Abstract
In an open gas exchange system with a thermocouple psychrometer the transpiration rate of the first leaf in 8-day plants of spring barley was measured in dependence on the water saturation deficit (ΔW sat). The plants were cultivated in Richter’s nutrient solution, either complete, or deficient in nitrogen or phosphorus. The cuticular transpiration (as measured in the dark) was unaffected by N and P deficiency. The N deficiency reduced the transpiration rate by increasing stomatal resistance since full water saturation of the leaf (67% rate of the control variant) up to stomatal closing at Δ Wsat = 14%. The P deficiency does not affect the transpiration rate at initial phases of wilting, but the stomata close only at a higher Δ Wsat (25%) than those in the control.
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Claims 5
Claim · model-written summary
N and P deficiency did not affect cuticular transpiration.
- Taxon
- spring barley
.jpg?width=60)
Hordeum vulgaree1 - Treatment
- N and P deficiencye0
- Outcome
- cuticular transpiratione0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The cuticular transpiration (as measured in the dark) was unaffected by N and P deficiency”
t0“spring barley”
e1“spring barley”
Claim · model-written summary
N deficiency reduced transpiration rate by increased stomatal resistance.
- Taxon
- spring barleyHordeum vulgaree1
- Treatment
- N deficiencye0
- Outcome
- transpiration ratee0
- Direction
- reducede0
- Value
- 67%e0
- Comparator
- control variante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N deficiency reduced the transpiration rate by increasing stomatal resistance since full water saturation of the leaf (67% rate of the control variant)”
t0“spring barley”
e1“spring barley”
Claim · model-written summary
N-deficient barley closed stomata at 14% water saturation deficit.
- Taxon
- spring barleyHordeum vulgaree1
- Treatment
- N deficiencye0
- Outcome
- stomatal closinge0
- Value
- 14%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N deficiency reduced the transpiration rate by increasing stomatal resistance since full water saturation of the leaf (67% rate of the control variant) up to stomatal closing at Δ Wsat = 14%”
t0“spring barley”
e1“spring barley”
Claim · model-written summary
P deficiency did not alter transpiration early in wilting.
- Taxon
- spring barleyHordeum vulgaree1
- Treatment
- P deficiencye0
- Outcome
- transpiration ratee0
- Direction
- does not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The P deficiency does not affect the transpiration rate at initial phases of wilting”
t0“spring barley”
e1“spring barley”
Claim · model-written summary
Under P deficiency, stomata closed at a higher saturation deficit of 25% than controls.
- Taxon
- spring barleyHordeum vulgaree1
- Treatment
- P deficiencye0
- Outcome
- Δ Wsate0
- Direction
- highere0
- Value
- 25%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The P deficiency does not affect the transpiration rate at initial phases of wilting, but the stomata close only at a higher Δ Wsat (25%) than those in the control”
t0“spring barley”
e1“spring barley”
The same questions in other papers
phosphorus · physiology: gas exchange · Hordeum vulgare (barley)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- positive
nitrogen · physiology: gas exchange · Hordeum vulgare (barley)Positive and negative results
4 in the opposite direction
- negative
- negative
- no effect
1 paper more in this group
See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.