Abstract
The aim of this work was to test the hypothesis that the reduced growth rate of wheat and barley that results when the roots are exposed to NaCl is due to inadequate turgor in the expanding cells of the leaves. The hypothesis was tested by exposing plants to 100 millimolar NaCl (which reduced their growth rates by about 20%), growing them for 7 to 10 days with their roots in pressure chambers, and applying sufficient pneumatic pressure in the chambers to offset the osmotic pressure of the NaCl, namely, 0.48 megapascals. The results showed that applying the pressure had no sustained effect (relative to unpressurized controls) on growth rates, transpiration rates, or osmotic pressures of the cell sap, in either the fully expanded or currently expanding leaf tissue, of both wheat and barley. The results indicate that the applied pressure correspondingly increased turgor in the shoot although this was not directly measured. We conclude that shoot turgor alone was not regulating the growth of these NaCl-affected plants, and, after discussing other possible influences, argue that a message arising in the roots may be regulating the growth of the shoot.
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Claims 6
Claim · model-written summary
NaCl exposure reduced wheat and barley growth rates by about 20%.
- Taxon
- Wheat and Barley
.jpg?width=60)
Hordeum vulgare
Triticum aestivumt0 - Treatment
- 100 millimolar NaCle0
- Outcome
- growth ratese0
- Direction
- reducede0
- Value
- about 20%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“exposing plants to 100 millimolar NaCl (which reduced their growth rates by about 20%)”
t0“Wheat and Barley”
Claim · model-written summary
Pressure offsetting NaCl osmotic pressure had no sustained effect on wheat and barley growth rates.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Treatment
- applying the pressuree0
- Outcome
- growth ratese0
- Direction
- no sustained effecte0
- Comparator
- unpressurized controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying the pressure had no sustained effect (relative to unpressurized controls) on growth rates, transpiration rates, or osmotic pressures of the cell sap”
t0“Wheat and Barley”
Claim · model-written summary
Pressure offsetting NaCl osmotic pressure had no sustained effect on wheat and barley transpiration rates or cell sap osmotic pressure.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Treatment
- applying the pressuree0
- Outcome
- transpiration rates, or osmotic pressures of the cell sape0
- Direction
- no sustained effecte0
- Comparator
- unpressurized controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying the pressure had no sustained effect (relative to unpressurized controls) on growth rates, transpiration rates, or osmotic pressures of the cell sap”
t0“Wheat and Barley”
Claim · model-written summary
The authors inferred that applied pressure increased shoot turgor, although they did not measure it directly.
Verbatim
e0“The results indicate that the applied pressure correspondingly increased turgor in the shoot although this was not directly measured.”
Claim · model-written summary
The authors concluded shoot turgor alone did not regulate growth of NaCl-affected wheat and barley.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Outcome
- growthe0
- Qualifier
- shoot turgor alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We conclude that shoot turgor alone was not regulating the growth of these NaCl-affected plants”
t0“Wheat and Barley”
Claim · model-written summary
The authors proposed a root-derived message may regulate shoot growth under NaCl.
- Taxon
- Wheat and BarleyHordeum vulgareTriticum aestivumt0
- Outcome
- growth of the shoote0
- Qualifier
- a message arising in the rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“argue that a message arising in the roots may be regulating the growth of the shoot.”
t0“Wheat and Barley”
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