Abstract
High Na(+) concentrations may disrupt K(+) and Ca(2+) transport and interfere with growth of many plant species, cotton (Gossypium hirsutum L.) included. Elevated Ca(2+) levels often counteract these consequences of salinity. The effect of supplemental Ca(2+) on influx of Ca(2+), K(+), and Na(+) in roots of intact, salt-stressed cotton seedlings was therefore investigated. Eight-day-old seedlings were exposed to treatments ranging from 0 to 250 millimolar NaCl in the presence of nutrient solutions containing 0.4 or 10 millimolar Ca(2+). Sodium influx increased proportionally to increasing salinity. At high external Ca(2+), Na(+) influx was less than at low Ca(2+). Calcium influx was complex and exhibited two different responses to salinity. At low salt concentrations, influx decreased curvilinearly with increasing salt concentration. At 150 to 250 millimolar NaCl, (45)Ca(2+) influx increased in proportion to salt concentrations, especially with high Ca(2+). Potassium influx declined significantly with increasing salinity, but was unaffected by external Ca(2+). The rate of K(+) uptake was dependent upon root weight, although influx was normalized for root weight. We conclude that the protection of root growth from salt stress by supplemental Ca(2+) is related to improved Ca-status and maintenance of K(+)/Na(+) selectivity.
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Claims 8
Claim · model-written summary
Sodium influx into cotton roots increased with increasing salinity.
- Taxon
- cotton
Gossypium hirsutumt0 - Organ / stage
- rootse0
- Treatment
- increasing salinitye2
- Outcome
- Sodium influxe2
- Direction
- increasede2
- Qualifier
- proportionallye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influx of Na+, K+, and Ca2+ into Roots of Salt-Stressed Cotton Seedlings”
e0“The effect of supplemental Ca(2+) on influx of Ca(2+), K(+), and Na(+) in roots of intact, salt-stressed cotton seedlings was therefore investigated.”
e2“Sodium influx increased proportionally to increasing salinity. At high external Ca(2+), Na(+) influx was less than at low Ca(2+).”
Claim · model-written summary
At high external Ca(2+), Na(+) influx into cotton roots was lower than at low Ca(2+).
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- rootse0
- Treatment
- high external Ca(2+)e2
- Outcome
- Na(+) influxe2
- Direction
- lesse2
- Comparator
- low Ca(2+)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influx of Na+, K+, and Ca2+ into Roots of Salt-Stressed Cotton Seedlings”
e0“The effect of supplemental Ca(2+) on influx of Ca(2+), K(+), and Na(+) in roots of intact, salt-stressed cotton seedlings was therefore investigated.”
e2“Sodium influx increased proportionally to increasing salinity. At high external Ca(2+), Na(+) influx was less than at low Ca(2+).”
Claim · model-written summary
At low salt concentrations, Ca(2+) influx into cotton roots decreased curvilinearly with increasing salt concentration.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- rootse0
- Treatment
- low salt concentrationse3
- Outcome
- Calcium influxe3
- Direction
- decreasede3
- Qualifier
- curvilinearlye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influx of Na+, K+, and Ca2+ into Roots of Salt-Stressed Cotton Seedlings”
e0“The effect of supplemental Ca(2+) on influx of Ca(2+), K(+), and Na(+) in roots of intact, salt-stressed cotton seedlings was therefore investigated.”
e3“Calcium influx was complex and exhibited two different responses to salinity. At low salt concentrations, influx decreased curvilinearly with increasing salt concentration. At 150 to 250 millimolar NaCl, (45)Ca(2+) influx increased in proportion to salt concentrations, especially with high Ca(2+).”
Claim · model-written summary
At 150 to 250 millimolar NaCl, Ca(2+) influx into cotton roots increased in proportion to salt concentration, especially with high Ca(2+).
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- rootse0
- Treatment
- 150 to 250 millimolar NaCle3
- Outcome
- (45)Ca(2+) influxe3
- Direction
- increasede3
- Qualifier
- especially with high Ca(2+)e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influx of Na+, K+, and Ca2+ into Roots of Salt-Stressed Cotton Seedlings”
e0“The effect of supplemental Ca(2+) on influx of Ca(2+), K(+), and Na(+) in roots of intact, salt-stressed cotton seedlings was therefore investigated.”
e3“Calcium influx was complex and exhibited two different responses to salinity. At low salt concentrations, influx decreased curvilinearly with increasing salt concentration. At 150 to 250 millimolar NaCl, (45)Ca(2+) influx increased in proportion to salt concentrations, especially with high Ca(2+).”
Claim · model-written summary
Potassium influx into cotton roots declined significantly with increasing salinity.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- rootse0
- Treatment
- increasing salinitye4
- Outcome
- Potassium influxe4
- Direction
- declinede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influx of Na+, K+, and Ca2+ into Roots of Salt-Stressed Cotton Seedlings”
e0“The effect of supplemental Ca(2+) on influx of Ca(2+), K(+), and Na(+) in roots of intact, salt-stressed cotton seedlings was therefore investigated.”
e4“Potassium influx declined significantly with increasing salinity, but was unaffected by external Ca(2+).”
Claim · model-written summary
Potassium influx into cotton roots was unaffected by external Ca(2+).
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- rootse0
- Treatment
- external Ca(2+)e4
- Outcome
- Potassium influxe4
- Direction
- unaffectede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influx of Na+, K+, and Ca2+ into Roots of Salt-Stressed Cotton Seedlings”
e0“The effect of supplemental Ca(2+) on influx of Ca(2+), K(+), and Na(+) in roots of intact, salt-stressed cotton seedlings was therefore investigated.”
e4“Potassium influx declined significantly with increasing salinity, but was unaffected by external Ca(2+).”
Claim · model-written summary
The rate of K(+) uptake by cotton roots was dependent upon root weight.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- roote5
- Outcome
- rate of K(+) uptakee5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influx of Na+, K+, and Ca2+ into Roots of Salt-Stressed Cotton Seedlings”
e5“The rate of K(+) uptake was dependent upon root weight, although influx was normalized for root weight.”
Claim · model-written summary
Supplemental Ca(2+) protects cotton root growth from salt stress, related to improved Ca-status and maintained K(+)/Na(+) selectivity.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- supplemental Ca(2+)e6
- Outcome
- protection of root growth from salt stresse6
- Qualifier
- improved Ca-status and maintenance of K(+)/Na(+) selectivitye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Influx of Na+, K+, and Ca2+ into Roots of Salt-Stressed Cotton Seedlings”
e6“We conclude that the protection of root growth from salt stress by supplemental Ca(2+) is related to improved Ca-status and maintenance of K(+)/Na(+) selectivity.”
The same questions in other papers
salinity · nutrient: content · Gossypium hirsutum (cotton)Positive and negative results
21 papers in the same direction as this paper · 5 in the opposite direction
- negative
- positive
- positive
23 papers more in this group
See all 27 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.