Abstract
Cotton (Gossypium hirsutum L. cv Acala SJ2) plants were exposed to three levels of osmotic or matric potentials. The first was obtained by salt and the latter by withholding irrigation water. Plants were acclimated to the two stress types by reducing the rate of stress development by a factor of 4 to 7. CO(2) assimilation was then determined on acclimated and nonacclimated plants. The decrease of CO(2) assimilation in salinity-exposed plants was significantly less in acclimated as compared with nonacclimated plants. Such a difference was not found under water stress at ambient CO(2) partial pressure. The slopes of net CO(2) assimilation versus intercellular CO(2) partial pressure, for the initial linear portion of this relationship, were increased in plants acclimated to salinity of -0.3 and -0.6 megapascal but not in nonacclimated plants. In plants acclimated to water stress, this change in slopes was not significant. Leaf osmotic potential was reduced much more in acclimated than in nonacclimated plants, resulting in turgor maintenance even at -0.9 megapascal. In nonacclimated plants, turgor pressure reached zero at approximately -0.5 megapascal. The accumulation of Cl(-) and Na(+) in the salinity-acclimated plants fully accounted for the decrease in leaf osmotic potential. The rise in concentration of organic solutes comprised only 5% of the total increase in solutes in salinity-acclimated and 10 to 20% in water-stress-acclimated plants. This acclimation was interpreted in light of the higher protein content per unit leaf area and the enhanced ribulose bisphosphate carboxylase activity. At saturating CO(2) partial pressure, the declined inhibition in CO(2) assimilation of stress-acclimated plants was found for both salinity and water stress.
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Claims 13
Claim · model-written summary
Acclimation lessened the decline in cotton CO(2) assimilation under salinity.
- Taxon
- Cotton
Gossypium hirsutumt0 - Treatment
- acclimatede0
- Outcome
- CO(2) assimilatione0
- Direction
- lesse0
- Qualifier
- salinity-exposed plantse0
- Comparator
- nonacclimated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease of CO(2) assimilation in salinity-exposed plants was significantly less in acclimated as compared with nonacclimated plants.”
t0“Cotton”
Claim · model-written summary
Acclimation produced no significant difference in CO(2) assimilation under water stress at ambient CO(2).
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- water stresse0
- Outcome
- differencee0
- Direction
- not founde0
- Qualifier
- ambient CO(2) partial pressuree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Such a difference was not found under water stress at ambient CO(2) partial pressure.”
t0“Cotton”
Claim · model-written summary
Salinity acclimation increased the initial assimilation versus intercellular CO(2) slope at -0.3 and -0.6 megapascal.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- acclimated to salinity of -0.3 and -0.6 megapascale0
- Outcome
- slopes of net CO(2) assimilation versus intercellular CO(2) partial pressuree0
- Direction
- increasede0
- Comparator
- nonacclimated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The slopes of net CO(2) assimilation versus intercellular CO(2) partial pressure, for the initial linear portion of this relationship, were increased in plants acclimated to salinity of -0.3 and -0.6 megapascal but not in nonacclimated plants.”
t0“Cotton”
Claim · model-written summary
Water-stress acclimation did not significantly change these slopes.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- acclimated to water stresse0
- Outcome
- slopese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plants acclimated to water stress, this change in slopes was not significant.”
t0“Cotton”
Claim · model-written summary
Acclimated plants had a much lower leaf osmotic potential than nonacclimated plants.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- acclimatede0
- Outcome
- Leaf osmotic potentiale0
- Direction
- reducede0
- Value
- -0.9 megapascale0
- Comparator
- nonacclimated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf osmotic potential was reduced much more in acclimated than in nonacclimated plants, resulting in turgor maintenance even at -0.9 megapascal.”
t0“Cotton”
Claim · model-written summary
Acclimated plants maintained turgor at -0.9 megapascal.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- turgor maintenancee0
- Value
- -0.9 megapascale0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulting in turgor maintenance even at -0.9 megapascal”
t0“Cotton”
Claim · model-written summary
Nonacclimated plants lost turgor at approximately -0.5 megapascal.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- turgor pressure reached zeroe0
- Direction
- reached zeroe0
- Value
- approximately -0.5 megapascale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In nonacclimated plants, turgor pressure reached zero at approximately -0.5 megapascal.”
t0“Cotton”
Claim · model-written summary
Cl(-) and Na(+) accumulation fully accounted for the osmotic-potential decline in salinity-acclimated plants.
- Taxon
- CottonGossypium hirsutumt0
- Compound
- Cl(-) and Na(+)e0
- Outcome
- leaf osmotic potentiale0
- Direction
- decreasee0
- Qualifier
- salinity-acclimated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The accumulation of Cl(-) and Na(+) in the salinity-acclimated plants fully accounted for the decrease in leaf osmotic potential.”
t0“Cotton”
Claim · model-written summary
Organic solutes supplied 5% of increased solutes in salinity-acclimated plants.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- concentration of organic solutese0
- Direction
- risee0
- Value
- 5%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rise in concentration of organic solutes comprised only 5% of the total increase in solutes in salinity-acclimated”
t0“Cotton”
Claim · model-written summary
Organic solutes supplied 10 to 20% of increased solutes in water-stress-acclimated plants.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- 10 to 20% in water-stress-acclimated plantse0
- Value
- 10 to 20%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“10 to 20% in water-stress-acclimated plants”
t0“Cotton”
Claim · model-written summary
Acclimation was associated with higher protein content per unit leaf area.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- protein content per unit leaf areae0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the higher protein content per unit leaf area”
t0“Cotton”
Claim · model-written summary
Acclimation was associated with enhanced ribulose bisphosphate carboxylase activity.
- Taxon
- CottonGossypium hirsutumt0
- Gene
- ribulose bisphosphate carboxylasee0
- Outcome
- ribulose bisphosphate carboxylase activitye0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the enhanced ribulose bisphosphate carboxylase activity”
t0“Cotton”
Claim · model-written summary
At saturating CO(2), acclimation reduced inhibition of CO(2) assimilation under both salinity and water stress.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- stress-acclimated plantse0
- Outcome
- inhibition in CO(2) assimilatione0
- Direction
- declinede0
- Qualifier
- both salinity and water stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At saturating CO(2) partial pressure, the declined inhibition in CO(2) assimilation of stress-acclimated plants was found for both salinity and water stress.”
t0“Cotton”
The same questions in other papers
salinity · physiology: photosynthesis · Gossypium hirsutum (cotton)Results differ
3 papers in the same direction as this paper · 22 in the opposite direction
- negative
- negative
- negative
22 papers more in this group
See all 26 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.