Abstract
Abstract Polyethylene glycol (PEG)-induced water stress in nutrient solutions decreased both water consumption and 45 Ca uptake by apple seedlings ( Malus domestica Borkh.) The decrease in water uptake was more severe than the decrease in 45 Ca uptake. When 45 Ca uptake was calculated on the basis of water consumption, it was found that 45 Ca uptake was not dependent on water uptake although water was necessary for movement of 45 Ca. In split-root experiments, PEG and 45 Ca were either applied to the same half of the root or to separate halves. Calcium uptake decreased in plants subjected to water stress. The results indicated that the site of this decrease was at the root, not the aerial portion of the plant which, indirectly, may affect root function and thus 45 Ca uptake. Split-root experiments also indicated that the unstressed half of the root cannot fully compensate for the stressed half of the root in either water or 45 Ca uptake. Water use of plants with half of their root under a −5.0 bar water stress was decreased by 30%. Urea-nitrogen pretreatment did not modify the effect of osmotic stress on leaf Ca, Mg and K concentrations, water use or dry matter production during the period of applied water stress. All these parameters decreased with increasing solution osmotic stress.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
PEG water stress decreased apple seedling water consumption.
- Taxon
- apple seedlings
Malus domesticae0 - Treatment
- Polyethylene glycol (PEG)-induced water stresse0
- Outcome
- water consumptione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Polyethylene glycol (PEG)-induced water stress in nutrient solutions decreased both water consumption and 45 Ca uptake by apple seedlings ( Malus domestica Borkh.)”
Claim · model-written summary
PEG water stress decreased 45 Ca uptake.
- Taxon
- apple seedlingsMalus domesticae0
- Treatment
- Polyethylene glycol (PEG)-induced water stresse0
- Outcome
- 45 Ca uptakee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Polyethylene glycol (PEG)-induced water stress in nutrient solutions decreased both water consumption and 45 Ca uptake by apple seedlings ( Malus domestica Borkh.)”
Claim · model-written summary
Water uptake fell more severely than 45 Ca uptake.
Not reportedTaxon
Verbatim
e0“The decrease in water uptake was more severe than the decrease in 45 Ca uptake.”
Claim · model-written summary
Calcium uptake normalized by water consumption was independent of water uptake.
Not reportedTaxon
Verbatim
e0“When 45 Ca uptake was calculated on the basis of water consumption, it was found that 45 Ca uptake was not dependent on water uptake although water was necessary for movement of 45 Ca.”
Claim · model-written summary
Calcium uptake decreased in water stressed plants.
- Taxon
- plantsViridiplantaee0
- Treatment
- water stresse0
- Outcome
- Calcium uptakee0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Calcium uptake decreased in plants subjected to water stress.”
Claim · model-written summary
The authors locate the calcium uptake decrease at the root.
Not reportedDirection
Verbatim
e0“The results indicated that the site of this decrease was at the root, not the aerial portion of the plant which, indirectly, may affect root function and thus 45 Ca uptake.”
Claim · model-written summary
The unstressed root half did not fully compensate for the stressed half in water uptake.
Not reportedTaxon
Verbatim
e0“the unstressed half of the root cannot fully compensate for the stressed half of the root in either water or 45 Ca uptake.”
Claim · model-written summary
The unstressed root half did not fully compensate for the stressed half in 45 Ca uptake.
Not reportedTaxon
Verbatim
e0“the unstressed half of the root cannot fully compensate for the stressed half of the root in either water or 45 Ca uptake.”
Claim · model-written summary
Half-root stress of −5.0 bar reduced water use by 30%.
- Taxon
- plantsViridiplantaee0
- Treatment
- −5.0 bar water stresse0
- Outcome
- Water usee0
- Direction
- decreasede0
- Value
- 30%e0
Not reportedComparator
Verbatim
e0“Water use of plants with half of their root under a −5.0 bar water stress was decreased by 30%.”
Claim · model-written summary
Urea-nitrogen pretreatment did not alter osmotic stress effects on leaf minerals, water use or dry matter.
- Treatment
- Urea-nitrogen pretreatmente0
- Outcome
- leaf Ca, Mg and K concentrations, water use or dry matter productione0
- Direction
- did not modifye0
Not reportedTaxonComparator
Verbatim
e0“Urea-nitrogen pretreatment did not modify the effect of osmotic stress on leaf Ca, Mg and K concentrations, water use or dry matter production during the period of applied water stress.”
Claim · model-written summary
These parameters declined as solution osmotic stress increased.
Not reportedTaxon
Verbatim
e0“All these parameters decreased with increasing solution osmotic stress.”
The same questions in other papers
poly(ethylene glycol) · physiology: water · Malus domestica (apple)Results agree
1 paper in the same direction as this paper
- negative
drought · physiology: water · Malus domestica (apple)Results differ
11 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
13 papers more in this group
See all 17 papers →drought · physiology: water · Viridiplantae (plants)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
nitrogen · physiology: water · Malus domestica (apple)Results agree
2 papers in the same direction as this paper
- negative
- no effect
drought · nutrient: content · Malus domestica (apple)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
drought · nutrient: content · Viridiplantae (plants)Results agree
5 papers in the same direction as this paper
- negative
- negative
- negative
2 papers more in this group
See all 6 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.