Abstract
Intact plants and stem-girdled plants of Phaseolus vulgaris grown hydroponically were exposed to 5 degrees C for up to 4 d; stem girdling was used to inhibit the phloem transport from the leaves to the roots. After initial water stress, stomatal closure and an amelioration of root water transport properties allowed the plants to rehydrate and regain turgor. Chilling augmented the concentration of abscisic acid (ABA) content in leaves, roots and xylem sap. In intact plants stomatal closure and leaf ABA accumulation were preceded by a slight alkalinization of xylem sap, but they occurred earlier than any increase in xylem ABA concentration could be detected. Stem girdling did not affect the influence of chilling on plant water relations and leaf ABA content, but it reduced slightly the alkalinization of xylem sap and, principally, prevented the massive ABA accumulation in root tissues and the associated transport in the xylem that was observed in non-girdled plants. When the plants were defoliated just prior to chilling or after 10 h at 5 degrees C, root and xylem sap ABA concentration remained unchanged throughout the whole stress period. When the plants were chilled under conditions preventing the occurrence of leaf water deficit (i.e. at 100% relative humidity), there were no significant variations in endogenous ABA levels. The increase in root hydraulic conductance in chilled plants was a response neither to root ABA accretion, nor to some leaf-borne chemical signal transported downwards in the phloem, nor to low temperature per se, as indicated by the results of the experiments with defoliated or girdled plants and with plants chilled at 100% relative humidity. It was concluded that the root system contributed substantially to the bean's ability to cope with chilling-induced water stress, but not in an ABA-dependent manner.
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Claims 9
Claim · model-written summary
After initial chilling water stress, stomata closed and root water transport improved, allowing rehydration.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarist0 - Outcome
- stomatal closure and an amelioration of root water transport propertiese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After initial water stress, stomatal closure and an amelioration of root water transport properties allowed the plants to rehydrate and regain turgor.”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Chilling increased ABA content in leaves, roots, and xylem sap.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- Chillinge0
- Outcome
- abscisic acid (ABA) content in leaves, roots and xylem sape0
- Direction
- augmentede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chilling augmented the concentration of abscisic acid (ABA) content in leaves, roots and xylem sap.”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
In intact plants xylem sap alkalinized before stomatal closure and leaf ABA accumulation, which preceded detectable xylem ABA increase.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Outcome
- a slight alkalinization of xylem sape0
- Direction
- alkalinizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In intact plants stomatal closure and leaf ABA accumulation were preceded by a slight alkalinization of xylem sap, but they occurred earlier than any increase in xylem ABA concentration could be detected.”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Stem girdling did not affect chilling effects on water relations and leaf ABA content.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- Stem girdlinge0
- Outcome
- plant water relations and leaf ABA contente0
- Direction
- did not affecte0
- Comparator
- non-girdled plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem girdling did not affect the influence of chilling on plant water relations and leaf ABA content”
t0“Phaseolus vulgaris L.”
e1“Stem girdling did not affect the influence of chilling on plant water relations and leaf ABA content, but it reduced slightly the alkalinization of xylem sap and, principally, prevented the massive ABA accumulation in root tissues and the associated transport in the xylem that was observed in non-girdled plants.”
Claim · model-written summary
Stem girdling slightly reduced xylem sap alkalinization.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- Stem girdlinge1
- Outcome
- alkalinization of xylem sape0
- Direction
- reduced slightlye0
- Comparator
- non-girdled plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it reduced slightly the alkalinization of xylem sap”
t0“Phaseolus vulgaris L.”
e1“Stem girdling did not affect the influence of chilling on plant water relations and leaf ABA content, but it reduced slightly the alkalinization of xylem sap and, principally, prevented the massive ABA accumulation in root tissues and the associated transport in the xylem that was observed in non-girdled plants.”
Claim · model-written summary
Stem girdling prevented massive ABA accumulation in root tissues and associated xylem transport.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- Stem girdlinge1
- Outcome
- massive ABA accumulation in root tissues and the associated transport in the xyleme0
- Direction
- preventede0
- Comparator
- non-girdled plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prevented the massive ABA accumulation in root tissues and the associated transport in the xylem that was observed in non-girdled plants”
t0“Phaseolus vulgaris L.”
e1“Stem girdling did not affect the influence of chilling on plant water relations and leaf ABA content, but it reduced slightly the alkalinization of xylem sap and, principally, prevented the massive ABA accumulation in root tissues and the associated transport in the xylem that was observed in non-girdled plants.”
Claim · model-written summary
Defoliation before or during chilling left root and xylem sap ABA concentration unchanged.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- defoliated just prior to chilling or after 10 h at 5 degrees Ce0
- Outcome
- root and xylem sap ABA concentratione0
- Direction
- remained unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the plants were defoliated just prior to chilling or after 10 h at 5 degrees C, root and xylem sap ABA concentration remained unchanged throughout the whole stress period.”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Chilling at full humidity produced no significant variation in endogenous ABA levels.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- chilled under conditions preventing the occurrence of leaf water deficite0
- Outcome
- endogenous ABA levelse0
- Direction
- no significant variationse0
- Qualifier
- at 100% relative humiditye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the plants were chilled under conditions preventing the occurrence of leaf water deficit (i.e. at 100% relative humidity), there were no significant variations in endogenous ABA levels.”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
The authors concluded that bean roots substantially help coping with chilling-induced water stress independently of ABA.
Verbatim
e0“It was concluded that the root system contributed substantially to the bean's ability to cope with chilling-induced water stress, but not in an ABA-dependent manner.”
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drought · physiology: hormones · Phaseolus vulgaris (common bean)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
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.