Abstract
During the first hours of chilling, bean (Phaseolus vulgaris L., cv Mondragone) seedlings suffer severe water stress and wilt without any significant increase in leaf abscisic acid (ABA) content (P. Vernieri, A. Pardossi, F. Tognoni [1991] Aust J Plant Physiol 18: 25-35). Plants regain turgor after 30 to 40 h. We hypothesized that inability to rapidly synthesize ABA at low temperatures contributes to chilling-induced water stress and that turgor recovery after 30 to 40 h is mediated by changes in endogenous ABA content. Entire bean seedlings were subjected to long-term (up to 6 d) chilling (3 degrees C, 0.2-0.4 kPa vapor pressure deficit, 100 mumol.m(-2).s(-1) photosynthetic photon flux density, continuous fluorescent light). During the first 24 h, stomata remained open, and plants rapidly wilted as leaf transpiration exceeded root water absorption. During this phase, ABA did not accumulate in leaves or in roots. After 24 h, ABA content increased in both tissues, leaf diffusion resistance increased, and plants rehydrated and regained turgor. No osmotic adjustment was associated with turgor recovery. Following turgor recovery, stomata remained closed, and ABA levels in both roots and leaves were elevated compared with controls. The application of ABA (0.1 mm) to the root system of the plants throughout exposure to 3 degrees C prevented the chilling-induced water stress. Excised leaves fed 0.1 mm ABA via the transpiration stream had greater leaf diffusion resistance at 20 and 3 degrees C compared with non-ABA fed controls, but the amount of ABA needed to elicit a given degree of stomatal closure was higher at 3 degrees C compared with 20 degrees C. These findings suggest that endogenous ABA may play a role in ameliorating plant water status during chilling.
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Claims 10
Claim · model-written summary
During the first 24 hours of chilling, stomata remained open and plants wilted as transpiration exceeded root absorption.
- Taxon
- Phaseolus vulgaris L.
Phaseolus vulgarist0 - Outcome
- stomata remained open, and plants rapidly wiltede0
- Qualifier
- first 24 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the first 24 h, stomata remained open, and plants rapidly wilted as leaf transpiration exceeded root water absorption”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
ABA did not accumulate in bean leaves or roots during the first chilling phase.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Outcome
- ABA did not accumulate in leaves or in rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During this phase, ABA did not accumulate in leaves or in roots”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
After 24 hours of chilling, ABA increased in roots and leaves.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Outcome
- ABA contente0
- Direction
- increasede0
- Qualifier
- After 24 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 24 h, ABA content increased in both tissues, leaf diffusion resistance increased, and plants rehydrated and regained turgor”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
After 24 hours, leaf diffusion resistance increased.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Outcome
- leaf diffusion resistancee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 24 h, ABA content increased in both tissues, leaf diffusion resistance increased, and plants rehydrated and regained turgor”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
After 24 hours, chilled plants rehydrated and regained turgor.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Outcome
- plants rehydrated and regained turgore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 24 h, ABA content increased in both tissues, leaf diffusion resistance increased, and plants rehydrated and regained turgor”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Turgor recovery was not associated with osmotic adjustment.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Outcome
- No osmotic adjustment was associated with turgor recoverye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No osmotic adjustment was associated with turgor recovery”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
After turgor recovery, stomata remained closed and root and leaf ABA levels were elevated versus controls.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Outcome
- stomata remained closed, and ABA levels in both roots and leaves were elevatede0
- Direction
- elevatede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Following turgor recovery, stomata remained closed, and ABA levels in both roots and leaves were elevated compared with controls”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Root-applied ABA prevented chilling-induced water stress.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- ABA (0.1 mm)e0
- Outcome
- chilling-induced water stresse0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of ABA (0.1 mm) to the root system of the plants throughout exposure to 3 degrees C prevented the chilling-induced water stress”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
ABA-fed excised leaves had greater diffusion resistance than non-fed controls at both temperatures.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- 0.1 mm ABAe0
- Outcome
- leaf diffusion resistancee0
- Direction
- greatere0
- Qualifier
- 20 and 3 degrees Ce0
- Comparator
- non-ABA fed controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excised leaves fed 0.1 mm ABA via the transpiration stream had greater leaf diffusion resistance at 20 and 3 degrees C compared with non-ABA fed controls”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
More ABA was needed for a given stomatal closure at 3 than 20 degrees C.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Outcome
- amount of ABA needed to elicit a given degree of stomatal closuree0
- Direction
- highere0
- Qualifier
- 3 degrees Ce0
- Comparator
- 20 degrees Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of ABA needed to elicit a given degree of stomatal closure was higher at 3 degrees C compared with 20 degrees C”
t0“Phaseolus vulgaris L.”
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.