Abstract
Abstract Uptake and transport of Na and K was studied using the radioactive tracers 22 Na and 42 K in intact Aster tripolium L. seedlings grown at two salinities CS 10 and CS 100, (containing 10mol m −1 and 100 mol m −3 Na, respectively, together with other major ions in the proportions found in sea water). At both salinities a much greater proportion of the Na than K taken up by the plant was subsequently transported to the shoot. Most 42 K fluxes were reduced by about 40% in CS 100 plants relative to CS 10 except root accumulation which increased. Experiments involving changing the salinity from CS 10 to CS 100 showed that 42 K fluxes remained constant for at least 40 h, indicating that competition with Na for uptake sites was not the cause of the reduced flux in CS 100 plants. 22 Na fluxes responded immediately to a change in salinity with all fluxes increasing six‐fold when the salinity was raised. When the salinity was lowered, however, root accumulation returned to the level in CS 10 control plants whereas transport to the shoot was inhibited by the previous high salinity treatment, being reduced to only 35% of the rate in CS 10 plants. The time courses of osmotic adjustment and Na accumulation following an increase in salinity were found to be very similar, with sufficient Na being accumulated to account for the observed increase in sap osmotic pressure.
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Claims 9
Claim · model-written summary
More absorbed sodium than potassium was transported to shoots at both salinities.
- Taxon
- Aster tripolium L.
Tripolium pannonicum subsp. tripoliumt0 - Outcome
- proportion of the Na than K taken up by the plant was subsequently transported to the shoote0
- Direction
- much greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At both salinities a much greater proportion of the Na than K taken up by the plant was subsequently transported to the shoot.”
t0“Aster tripolium L.”
Claim · model-written summary
Most potassium fluxes fell by about 40% at CS 100 relative to CS 10.
- Taxon
- Aster tripolium L.Tripolium pannonicum subsp. tripoliumt0
- Treatment
- CS 100e0
- Outcome
- 42 K fluxese0
- Direction
- reducede0
- Value
- about 40%e0
- Comparator
- CS 10e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most 42 K fluxes were reduced by about 40% in CS 100 plants relative to CS 10 except root accumulation which increased.”
t0“Aster tripolium L.”
Claim · model-written summary
Potassium root accumulation increased at CS 100 relative to CS 10.
- Taxon
- Aster tripolium L.Tripolium pannonicum subsp. tripoliumt0
- Treatment
- CS 100e0
- Outcome
- root accumulatione0
- Direction
- increasede0
- Comparator
- CS 10e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most 42 K fluxes were reduced by about 40% in CS 100 plants relative to CS 10 except root accumulation which increased.”
t0“Aster tripolium L.”
Claim · model-written summary
Potassium fluxes remained constant for at least 40 hours after raising salinity.
- Taxon
- Aster tripolium L.Tripolium pannonicum subsp. tripoliumt0
- Treatment
- CS 100e0
- Outcome
- 42 K fluxese0
- Direction
- remained constante0
- Value
- at least 40 he0
- Comparator
- CS 10e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“changing the salinity from CS 10 to CS 100 showed that 42 K fluxes remained constant for at least 40 h”
t0“Aster tripolium L.”
Claim · model-written summary
Sodium fluxes increased six-fold immediately after salinity rose.
- Taxon
- Aster tripolium L.Tripolium pannonicum subsp. tripoliumt0
- Treatment
- salinity was raisede0
- Outcome
- 22 Na fluxese0
- Direction
- increasinge0
- Value
- six‐folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“22 Na fluxes responded immediately to a change in salinity with all fluxes increasing six‐fold when the salinity was raised.”
t0“Aster tripolium L.”
Claim · model-written summary
After lowering salinity, sodium root accumulation returned to the CS 10 control level.
- Taxon
- Aster tripolium L.Tripolium pannonicum subsp. tripoliumt0
- Treatment
- salinity was lowerede0
- Outcome
- root accumulatione0
- Direction
- returned to the levele0
- Comparator
- CS 10 control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the salinity was lowered, however, root accumulation returned to the level in CS 10 control plants”
t0“Aster tripolium L.”
Claim · model-written summary
After lowering salinity, prior high salinity inhibited sodium transport to shoots to 35% of CS 10 controls.
- Taxon
- Aster tripolium L.Tripolium pannonicum subsp. tripoliumt0
- Treatment
- previous high salinity treatmente0
- Outcome
- transport to the shoote0
- Direction
- inhibitede0
- Value
- 35%e0
- Comparator
- CS 10 plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transport to the shoot was inhibited by the previous high salinity treatment, being reduced to only 35% of the rate in CS 10 plants”
t0“Aster tripolium L.”
Claim · model-written summary
Osmotic adjustment and sodium accumulation had similar time courses after salinity increased.
- Taxon
- Aster tripolium L.Tripolium pannonicum subsp. tripoliumt0
- Treatment
- increase in salinitye0
- Outcome
- time courses of osmotic adjustment and Na accumulatione0
- Direction
- very similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The time courses of osmotic adjustment and Na accumulation following an increase in salinity were found to be very similar”
t0“Aster tripolium L.”
Claim · model-written summary
Accumulated sodium was sufficient to account for increased sap osmotic pressure.
- Taxon
- Aster tripolium L.Tripolium pannonicum subsp. tripoliumt0
- Compound
- Nae0
- Outcome
- increase in sap osmotic pressuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sufficient Na being accumulated to account for the observed increase in sap osmotic pressure”
t0“Aster tripolium L.”
The same questions in other papers
salinity · molecular: metabolites · Tripolium pannonicum (sea starwort)Positive and negative results
1 in the opposite direction
- positive
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.