Abstract
Intact bean seedlings were subjected to either chilling (4°C) or drought stress. Leaf water relations and abscisic acid (ABA) content were monitored throughout a stress-recovery cycle. Chilling at low relative humidity (RH) and drought caused similar water deficits, as indicated by the decline in relative water content and water potentials, but they had different effects on ABA accumulation. There was a rapid increase in ABA levels in the leaves of water-deprived plants while only slight ABA accumulation was observed after 48 h of chilling (4°C). After 24 h cold treatment there were large changes in turgor but no change in ABA content. Plants chilled for 24 h accumulated ABA only when transferred to recovery conditions (20°C, 90-95% RH, in the dark) to an extent that was related to the rate of leaf rehydration. When the chilling treatment was performed in a water-saturated atmosphere, plants did not suffer any water stress and ABA levels did not increase over a period of 48 h. However, when the chilling treatment lasted for a longer period (72 h), a significant increase in ABA levels was found also in the absence of water deficit. Experiments performed with leaf discs incubated in a mannitol solution (osmotic potential - 1.6 MPa) at different temperatures indicated that low temperature markedly inhibits ABA synthesis and that water stress induces increases in ABA content only at non-limiting warm temperatures.
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Claims 10
Claim · model-written summary
Chilling at low relative humidity and drought caused similar declines in relative water content and water potentials.
- Taxon
- beant0
- Treatment
- Chilling at low relative humidity (RH) and droughte0
- Outcome
- relative water content and water potentialse0
- Direction
- declinee0
Not reportedComparator
Verbatim
e0“Chilling at low relative humidity (RH) and drought caused similar water deficits, as indicated by the decline in relative water content and water potentials”
t0“Bean”
Claim · model-written summary
Water-deprived bean plants showed a rapid increase in leaf ABA.
- Taxon
- beant0
- Organ / stage
- leavese0
- Treatment
- water-deprivede0
- Outcome
- ABA levelse0
- Direction
- rapid increasee0
Not reportedComparator
Verbatim
e0“There was a rapid increase in ABA levels in the leaves of water-deprived plants”
t0“Bean”
Claim · model-written summary
After 48 h chilling at 4°C, bean plants had only slight ABA accumulation.
Not reportedComparator
Verbatim
e0“only slight ABA accumulation was observed after 48 h of chilling (4°C).”
t0“Bean”
Claim · model-written summary
After 24 h cold treatment, bean turgor changed substantially.
Not reportedComparator
Verbatim
e0“After 24 h cold treatment there were large changes in turgor but no change in ABA content.”
t0“Bean”
Claim · model-written summary
After 24 h cold treatment, bean ABA content did not change.
Not reportedComparator
Verbatim
e0“After 24 h cold treatment there were large changes in turgor but no change in ABA content.”
t0“Bean”
Claim · model-written summary
After 24 h chilling, bean plants accumulated ABA on transfer to recovery conditions, related to leaf rehydration rate.
Verbatim
e0“Plants chilled for 24 h accumulated ABA only when transferred to recovery conditions (20°C, 90-95% RH, in the dark) to an extent that was related to the rate of leaf rehydration.”
t0“Bean”
Claim · model-written summary
Chilling in water-saturated atmosphere did not cause bean water stress or ABA increase over 48 h.
- Taxon
- beant0
- Treatment
- chilling treatmente0
- Outcome
- water stress and ABA levelse0
- Direction
- did not increasee0
- Qualifier
- water-saturated atmospheree0
Not reportedComparator
Verbatim
e0“when the chilling treatment was performed in a water-saturated atmosphere, plants did not suffer any water stress and ABA levels did not increase over a period of 48 h.”
t0“Bean”
Claim · model-written summary
At 72 h, chilling significantly increased bean ABA despite no water deficit.
- Taxon
- beant0
- Treatment
- chilling treatmente0
- Outcome
- ABA levelse0
- Direction
- increasee0
- Qualifier
- absence of water deficite0
Not reportedComparator
Verbatim
e0“when the chilling treatment lasted for a longer period (72 h), a significant increase in ABA levels was found also in the absence of water deficit.”
t0“Bean”
Claim · model-written summary
Low temperature markedly inhibited ABA synthesis in bean leaf discs.
- Taxon
- beant0
- Organ / stage
- leaf discse0
- Treatment
- low temperaturee0
- Outcome
- ABA synthesise0
- Direction
- inhibitse0
Not reportedComparator
Verbatim
e0“Experiments performed with leaf discs incubated in a mannitol solution (osmotic potential - 1.6 MPa) at different temperatures indicated that low temperature markedly inhibits ABA synthesis”
t0“Bean”
Claim · model-written summary
Water stress increased bean leaf-disc ABA only at non-limiting warm temperatures.
- Taxon
- beant0
- Treatment
- water stresse0
- Outcome
- ABA contente0
- Direction
- increasese0
- Qualifier
- only at non-limiting warm temperaturese0
Not reportedComparator
Verbatim
e0“water stress induces increases in ABA content only at non-limiting warm temperatures.”
t0“Bean”
The same questions in other papers
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- no effect
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- positive
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1 paper in the same direction as this paper · 1 in the opposite direction
- positive
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1 paper in the same direction as this paper
- no effect
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.