Abstract
The dynamics of osmotic adjustment in response to the development of plant water deficits were studied in the leaves of several upland rice cultivars. As deficits developed, the osmotic potential of leaves of plants not previously stressed decreased more rapidly than expected if due only to dehydration, with the result that the loss of turgor was delayed. Under rapid soil drying conditions (4 to 6 days), osmotic potential declined nearly linearly with water potential as water potential declined to about −12 bars, but the rate was not sufficient to totally maintain turgor. Under slow soil drying conditions (20 to 22 days), the reduction of osmotic potential, after an initially more rapid decline which was sufficient to totally maintain turgor, was similar to that found under the rapid drying conditions. The final extent of active reduction of osmotic potential was identical under both rapid and slow drying conditions and resulted in minimum “fully hydrated” osmotic potentials of approximately −18 bars. Plants exposed to more than one cycle of stress and 2 days of recovery showed no active osmotic adjustment beyond this minimum during subsequent stress. Thus there was a limit to the extent of osmotic adjustment which was independent of the rate of stress development and stress duration. The actual extent of adjustment depended on stress history and stress intensity.
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Claims 11
Claim · model-written summary
As water deficits developed, leaf osmotic potential of unstressed upland rice plants decreased more rapidly than expected from dehydration alone.
- Taxon
- Rice
Oryza sativat0 - Material
- upland rice cultivarse0
- Treatment
- deficitse1
- Outcome
- osmotic potential of leavese1
- Direction
- decreased more rapidlye1
- Comparator
- expected if due only to dehydratione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e0“in the leaves of several upland rice cultivars”
e1“As deficits developed, the osmotic potential of leaves of plants not previously stressed decreased more rapidly than expected if due only to dehydration”
Claim · model-written summary
Loss of turgor in upland rice leaves under water deficit was delayed by active osmotic adjustment.
- Taxon
- RiceOryza sativat0
- Treatment
- deficitse1
- Outcome
- loss of turgore2
- Direction
- delayede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e1“As deficits developed, the osmotic potential of leaves of plants not previously stressed decreased more rapidly than expected if due only to dehydration”
e2“with the result that the loss of turgor was delayed”
Claim · model-written summary
Under rapid soil drying, leaf osmotic potential declined nearly linearly with water potential until water potential reached about −12 bars.
- Taxon
- RiceOryza sativat0
- Treatment
- rapid soil drying conditions (4 to 6 days)e1
- Outcome
- osmotic potentiale1
- Direction
- declined nearly linearlye1
- Value
- about −12 barse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e1“Under rapid soil drying conditions (4 to 6 days), osmotic potential declined nearly linearly with water potential as water potential declined to about −12 bars”
Claim · model-written summary
Under rapid soil drying, the rate of osmotic adjustment was not sufficient to totally maintain turgor.
- Taxon
- RiceOryza sativat0
- Treatment
- rapid soil drying conditions (4 to 6 days)e1
- Outcome
- totally maintain turgore2
- Direction
- not sufficiente2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e1“Under rapid soil drying conditions (4 to 6 days), osmotic potential declined nearly linearly with water potential as water potential declined to about −12 bars”
e2“but the rate was not sufficient to totally maintain turgor”
Claim · model-written summary
The reduction of osmotic potential under slow soil drying was similar to that under rapid soil drying.
- Taxon
- RiceOryza sativat0
- Treatment
- slow soil drying conditions (20 to 22 days)e1
- Outcome
- the reduction of osmotic potentiale1
- Direction
- was similare1
- Comparator
- rapid drying conditionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e1“Under slow soil drying conditions (20 to 22 days), the reduction of osmotic potential, after an initially more rapid decline which was sufficient to totally maintain turgor, was similar to that found under the rapid drying conditions”
Claim · model-written summary
Under slow soil drying, the initially more rapid decline of osmotic potential was sufficient to totally maintain turgor.
- Taxon
- RiceOryza sativat0
- Treatment
- slow soil drying conditions (20 to 22 days)e1
- Outcome
- totally maintain turgore1
- Direction
- sufficiente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e1“Under slow soil drying conditions (20 to 22 days), the reduction of osmotic potential, after an initially more rapid decline which was sufficient to totally maintain turgor, was similar to that found under the rapid drying conditions”
Claim · model-written summary
The final extent of active reduction of osmotic potential was identical under rapid and slow soil drying.
- Taxon
- RiceOryza sativat0
- Treatment
- both rapid and slow drying conditionse1
- Outcome
- final extent of active reduction of osmotic potentiale1
- Direction
- identicale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e1“The final extent of active reduction of osmotic potential was identical under both rapid and slow drying conditions”
Claim · model-written summary
Minimum fully hydrated osmotic potentials of upland rice were approximately −18 bars.
- Taxon
- RiceOryza sativat0
- Outcome
- osmotic potentialse1
- Value
- approximately −18 barse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e1“osmotic potentials of approximately −18 bars”
Claim · model-written summary
Plants exposed to more than one cycle of stress with 2 days of recovery showed no active osmotic adjustment beyond the minimum during subsequent stress.
- Taxon
- RiceOryza sativat0
- Treatment
- more than one cycle of stress and 2 days of recoverye1
- Outcome
- active osmotic adjustment beyond this minimume1
- Direction
- showed noe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e1“Plants exposed to more than one cycle of stress and 2 days of recovery showed no active osmotic adjustment beyond this minimum during subsequent stress”
Claim · model-written summary
There is a limit to the extent of osmotic adjustment in rice that is independent of the rate of stress development and stress duration.
- Taxon
- RiceOryza sativat0
- Outcome
- extent of osmotic adjustmente1
- Qualifier
- independent of the rate of stress development and stress duratione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e1“Thus there was a limit to the extent of osmotic adjustment which was independent of the rate of stress development and stress duration”
Claim · model-written summary
The extent of osmotic adjustment in rice depended on stress history and stress intensity.
- Taxon
- RiceOryza sativat0
- Treatment
- stress history and stress intensitye1
- Outcome
- extent of adjustmente1
- Direction
- depended one1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Osmotic Adjustment in Rice”
e1“The actual extent of adjustment depended on stress history and stress intensity”
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See all 35 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.