Abstract
Leaf abscisic acid (ABA) levels of chilled P. vulgaris were measured after 18 h chilling at 5°C, at a saturation deficit of 1.24 g m−3 (SD), and after chilling in a water-saturated atmosphere. Changes were also followed during a chill hardening period of 4 d at 12°C, 2.1 g m−3 SD. It was found that hardening resulted in an almost 5. fold increase in ABA levels after 3 d at 12°C, and this decreased to approximately control levels on the fourth day. Subsequent chilling of hardened plants produced no change in ABA levels from that of control plants (22° C). In contrast, non-hardened plants chilled at 1.24 g m−3 SD had ABA levels almost 3 times the level of control plants. However, chilling in a water-saturated atmosphere resulted in a decrease in ABA levels. In addition, the response of leaf diffusion resistance (LDR) to exogenous ABA fed via the transpiration stream was measured at 5 ° C and 22° C in hardened and non-hardened plants. Use of tritium-labelled ABA was made to calculate the stomatal sensitivity to ABA. It was found that exogenous ABA caused an increased in LDR at 22°C in both hardened and non-hardened plants. However, the sensitivity of the hardened plants to ABA was greater in terms of rate of closure and amount of ABA required to close the stomata. At 5°C, however, ABA caused stomatal opening and the maintainance of open stomata in non-hardened plants. In hardened plants, ABA caused stomatal closure at 5°C. These results are discussed in relation to the locking-open response of chilled P. vulgaris stomata.
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Claims 8
Claim · model-written summary
Hardening nearly quintupled leaf ABA after three days, followed by a decline to control levels on day four.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarist0 - Treatment
- hardeninge0
- Outcome
- ABA levelse0
- Direction
- increasee0
- Value
- almost 5. folde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hardening resulted in an almost 5. fold increase in ABA levels after 3 d at 12°C, and this decreased to approximately control levels on the fourth day”
t0“Phaseolus vulgaris”
Claim · model-written summary
Subsequent chilling of hardened plants did not change ABA levels relative to controls.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- Subsequent chilling of hardened plantse0
- Outcome
- ABA levelse0
- Direction
- no changee0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsequent chilling of hardened plants produced no change in ABA levels from that of control plants (22° C)”
t0“Phaseolus vulgaris”
Claim · model-written summary
Chilled non-hardened plants had almost triple the ABA of controls.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- chilled at 1.24 g m−3 SDe0
- Outcome
- ABA levelse0
- Value
- almost 3 timese0
- Comparator
- control plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-hardened plants chilled at 1.24 g m−3 SD had ABA levels almost 3 times the level of control plants”
t0“Phaseolus vulgaris”
Claim · model-written summary
Chilling in saturated air decreased ABA levels.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- chilling in a water-saturated atmospheree0
- Outcome
- ABA levelse0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chilling in a water-saturated atmosphere resulted in a decrease in ABA levels”
t0“Phaseolus vulgaris”
Claim · model-written summary
Exogenous ABA increased leaf diffusion resistance at 22°C in hardened and non-hardened plants.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- exogenous ABAe0
- Outcome
- LDRe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenous ABA caused an increased in LDR at 22°C in both hardened and non-hardened plants”
t0“Phaseolus vulgaris”
Claim · model-written summary
Hardened plants were more sensitive to ABA in closure rate and ABA amount required.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Outcome
- rate of closure and amount of ABA required to close the stomatae0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sensitivity of the hardened plants to ABA was greater in terms of rate of closure and amount of ABA required to close the stomata”
t0“Phaseolus vulgaris”
Claim · model-written summary
At 5°C ABA caused opening and maintenance of open stomata in non-hardened plants.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- ABAe0
- Outcome
- stomatal opening and the maintainance of open stomatae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 5°C, however, ABA caused stomatal opening and the maintainance of open stomata in non-hardened plants”
t0“Phaseolus vulgaris”
Claim · model-written summary
At 5°C ABA caused stomatal closure in hardened plants.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- ABAe0
- Outcome
- stomatal closuree0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In hardened plants, ABA caused stomatal closure at 5°C”
t0“Phaseolus vulgaris”
The same questions in other papers
(+)-abscisic acid · disease · Phaseolus vulgaris (common bean)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- positive
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.