Abstract
Abstract The effect of calcium (Ca2+), aluminum (Al3+), and high salinity stress on the influx‐efllux relations of nitrate (NO3 ‐) was investigated in barley and squash seedlings using continuous monitoring techniques and 13N labelling. After 24 h of Ca2+ deficiency NO3 ‐ influx was substantially reduced at the level of unsaturated NO3 ‐ uptake. With prolonged Ca2+ deficiency the repression of NO3 ‐influx drastically increased in squash involving irreversible impairment of the whole root function whereas the impairment only progressed more moderately in barley. Treatment with 160 μM Al3+ for 24 h also induced a repression of NO3 ‐ influx probably due to an interaction between Al3+ and Ca2+ ions. In both Ca2+ deficiency and Al3+ toxicity experiments, the NO3 ‐ efflux was only slightly affected. Suddenly imposed high salinity at a species‐specific level resulted in an instantaneous repression of NO3 ‐ influx accompanied by a heavy release of NO3 ‐ to the ambient nutrient solution. The results are discussed in the light of the key role which Ca2+ is suggested to play in membrane integrity and at the level of intracellular processes and in view of the relations to carrier‐mediated NO3 ‐ influx.
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Claims 9
Claim · model-written summary
After 24 hours of calcium deficiency, nitrate influx at unsaturated uptake was substantially reduced in barley.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- 24 h of Ca2+ deficiencye0
- Outcome
- NO3 ‐ influxe0
- Direction
- substantially reducede0
Not reportedMaterialComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“After 24 h of Ca2+ deficiency NO3 ‐ influx was substantially reduced at the level of unsaturated NO3 ‐ uptake.”
t0“barley and squash seedlings”
Claim · model-written summary
After 24 hours of calcium deficiency, nitrate influx at unsaturated uptake was substantially reduced in squash.
- Taxon
- squasht0
- Treatment
- 24 h of Ca2+ deficiencye0
- Outcome
- NO3 ‐ influxe0
- Direction
- substantially reducede0
Not reportedMaterialComparatorSettingValueQualifier
Verbatim
e0“After 24 h of Ca2+ deficiency NO3 ‐ influx was substantially reduced at the level of unsaturated NO3 ‐ uptake.”
t0“barley and squash seedlings”
Claim · model-written summary
Prolonged calcium deficiency drastically increased nitrate influx repression and irreversibly impaired squash roots.
- Taxon
- squashe0
- Treatment
- prolonged Ca2+ deficiencye0
- Outcome
- repression of NO3 ‐influxe0
- Direction
- drastically increasede0
Not reportedMaterialComparatorSettingValueQualifier
Verbatim
e0“With prolonged Ca2+ deficiency the repression of NO3 ‐influx drastically increased in squash involving irreversible impairment of the whole root function”
Claim · model-written summary
Under prolonged calcium deficiency, nitrate influx impairment progressed more moderately in barley than squash.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- prolonged Ca2+ deficiencye0
- Outcome
- impairmente0
- Direction
- more moderatelye0
Not reportedMaterialComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With prolonged Ca2+ deficiency the repression of NO3 ‐influx drastically increased in squash involving irreversible impairment of the whole root function whereas the impairment only progressed more moderately in barley.”
t0“barley and squash seedlings”
Claim · model-written summary
Aluminium treatment repressed nitrate influx.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- 160 μM Al3+ for 24 he0
- Outcome
- NO3 ‐ influxe0
- Direction
- repressione0
Not reportedMaterialComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment with 160 μM Al3+ for 24 h also induced a repression of NO3 ‐ influx”
t0“barley and squash seedlings”
Claim · model-written summary
Calcium deficiency only slightly affected nitrate efflux.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Ca2+ deficiencye0
- Outcome
- NO3 ‐ effluxe0
Not reportedMaterialComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both Ca2+ deficiency and Al3+ toxicity experiments, the NO3 ‐ efflux was only slightly affected.”
t0“barley and squash seedlings”
Claim · model-written summary
Aluminium toxicity only slightly affected nitrate efflux.
Not reportedMaterialComparatorSettingDirectionValueQualifier
Verbatim
e0“In both Ca2+ deficiency and Al3+ toxicity experiments, the NO3 ‐ efflux was only slightly affected.”
t0“barley and squash seedlings”
Claim · model-written summary
Sudden high salinity immediately repressed nitrate influx.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- high salinitye0
- Outcome
- NO3 ‐ influxe0
- Direction
- repressione0
Not reportedMaterialComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Suddenly imposed high salinity at a species‐specific level resulted in an instantaneous repression of NO3 ‐ influx”
t0“barley and squash seedlings”
Claim · model-written summary
Sudden high salinity induced heavy nitrate release to nutrient solution.
- Taxon
- squasht0
- Treatment
- high salinitye0
- Outcome
- release of NO3 ‐ to the ambient nutrient solutione0
- Direction
- heavy releasee0
Not reportedMaterialComparatorSettingValueQualifier
Verbatim
e0“Suddenly imposed high salinity at a species‐specific level resulted in an instantaneous repression of NO3 ‐ influx accompanied by a heavy release of NO3 ‐ to the ambient nutrient solution.”
t0“barley and squash seedlings”
The same questions in other papers
salinity · nutrient: content · Cucurbita (pumpkins)Results agree
4 papers in the same direction as this paper
- no effect
- negative
- negative
1 paper more in this group
See all 5 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.