Abstract
Treatment of bean (Phaseolus vulgaris L.) seedlings with low levels of salinity (50 or 100 millimolar NaCl) decreased the rate of light-induced leaf cell expansion in the primary leaves over a 3 day period. This decrease could be due to a reduction in one or both of the primary cellular growth parameters: wall extensibility and cell turgor. Wall extensibility was assessed by the Instron technique. Salinity did not decrease extensibility and caused small increases relative to the controls after 72 hours. On the other hand, 50 millimolar NaCl caused a significant reduction in leaf bulk turgor at 24 hours; adaptive decreases in leaf osmotic potential (osmotic adjustment) were more than compensated by parallel decreases in xylem tension potential and the leaf apoplastic solute potential, resulting in a decreased leaf water potential. It is concluded that in bean seedlings, mild salinity initially affects leaf growth rate by a decrease in turgor rather than by a reduction in wall extensibility. Moreover, long-term salinization (10 days) resulted in an apparent mechanical adjustment, i.e. an increase in wall extensibility, which may help counteract reductions in turgor and maintain leaf growth rates.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 7
Claim · model-written summary
50 or 100 millimolar NaCl decreased light-induced primary leaf cell expansion over three days.
- Taxon
- beane0
- Organ / stage
- primary leavese0
- Treatment
- 50 or 100 millimolar NaCle0
- Outcome
- rate of light-induced leaf cell expansione0
- Direction
- decreasede0
- Qualifier
- over a 3 day periode0
Not reportedComparator
Verbatim
e0“Treatment of bean (Phaseolus vulgaris L.) seedlings with low levels of salinity (50 or 100 millimolar NaCl) decreased the rate of light-induced leaf cell expansion in the primary leaves over a 3 day period.”
Claim · model-written summary
Salinity did not decrease wall extensibility and slightly increased it after 72 hours.
Verbatim
e0“Salinity did not decrease extensibility and caused small increases relative to the controls after 72 hours.”
t0“Bean”
Claim · model-written summary
50 millimolar NaCl significantly reduced leaf bulk turgor at 24 hours.
- Taxon
- beant0
- Treatment
- 50 millimolar NaCle0
- Outcome
- leaf bulk turgore0
- Direction
- reductione0
- Qualifier
- at 24 hourse0
Not reportedComparator
Verbatim
e0“50 millimolar NaCl caused a significant reduction in leaf bulk turgor at 24 hours”
t0“Bean”
Claim · model-written summary
Osmotic adjustment was outweighed by declines in xylem tension and apoplastic solute potential, reducing leaf water potential.
Verbatim
e0“adaptive decreases in leaf osmotic potential (osmotic adjustment) were more than compensated by parallel decreases in xylem tension potential and the leaf apoplastic solute potential, resulting in a decreased leaf water potential.”
t0“Bean”
Claim · model-written summary
Mild salinity initially reduces bean leaf growth through lower turgor rather than lower wall extensibility.
Verbatim
e0“mild salinity initially affects leaf growth rate by a decrease in turgor rather than by a reduction in wall extensibility.”
t0“Bean”
Claim · model-written summary
Ten days of salinization increased wall extensibility.
- Taxon
- beant0
- Treatment
- long-term salinization (10 days)e0
- Outcome
- wall extensibilitye0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“long-term salinization (10 days) resulted in an apparent mechanical adjustment, i.e. an increase in wall extensibility”
t0“Bean”
Claim · model-written summary
The authors suggest greater wall extensibility may help maintain leaf growth despite lower turgor.
Verbatim
e0“which may help counteract reductions in turgor and maintain leaf growth rates.”
t0“Bean”
The same questions in other papers
sodium chloride · physiology: water · Phaseolus vulgaris (common bean)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
3 papers more in this group
See all 7 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.