Abstract
SUMMARY In wheat plants it was found that salinity stress (50 mM NaCl) and an increase in the exogenous Ca 2+ supply (to 5 mM) had a differential influence on N uptake capacity depending on the N source (NO 3− or NH 4+ ). In NO 3 − supplied wheat plants which had not been supplied with supplemental calcium, a salinity of 50 mM NaCl reduced the N uptake rate of the root by 30 %, reduced the F max of NO 3 − uptake by 38 % and the N concentration of the plants by 35 %. In NH 4 + supplied plants (which were not affected by a change in calcium concentration) a salinity of 50 mM resulted in a reduction in the N concentration by 16 % (only in the root), a reduction in the F max of NH 4 + uptake by 50 %, while the N uptake rate by the plant was reduced by 16 %. In salt‐stressed NO 3 − supplied wheat, an exogenous Ca 24 concentration of 5 mM resulted in a 65 % increase in V max of NO 3 − uptake, a 58% increase in NO 3 − uptake rate by the shoot per g root and a 61 and 5 % increase in shoot and root N concentration respectively. Increased exogenous concentrations of either Ca 2+ or K + had no effect on NH 4 + uptake. Kinetic calculations indicate that the inhibitory activity of NaCl on both NO 3 − and NH 4 + uptake was one of noncompetitive inhibition. When NO 3 − , but not NH 4 + , was the N source, Ca 2+ at a concentration of 5 mM partially ameliorated the NaCl‐mediated inhibition of NO 3 − uptake.
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Claims 15
Claim · model-written summary
Salinity reduced root nitrogen uptake rate by 30% in nitrate-fed wheat without supplemental calcium.
- Taxon
- wheat
Triticum aestivume0 - Organ / stage
- roote0
- Treatment
- a salinity of 50 mM NaCle0
- Outcome
- N uptake rate of the roote0
- Direction
- reducede0
- Value
- 30 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In NO 3 − supplied wheat plants which had not been supplied with supplemental calcium, a salinity of 50 mM NaCl reduced the N uptake rate of the root by 30 %”
Claim · model-written summary
Salinity reduced the maximum nitrate uptake rate by 38% in nitrate-fed wheat.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- a salinity of 50 mM NaCle0
- Outcome
- F max of NO 3 − uptakee0
- Direction
- reducede0
- Value
- 38 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a salinity of 50 mM NaCl reduced the N uptake rate of the root by 30 %, reduced the F max of NO 3 − uptake by 38 %”
t0“Triticum aestivum L.”
Claim · model-written summary
Salinity reduced plant nitrogen concentration by 35% in nitrate-fed wheat.
- Taxon
- wheatTriticum aestivume0
- Treatment
- a salinity of 50 mM NaCle0
- Outcome
- N concentration of the plantse0
- Direction
- reducede0
- Value
- 35 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In NO 3 − supplied wheat plants which had not been supplied with supplemental calcium, a salinity of 50 mM NaCl reduced the N uptake rate of the root by 30 %, reduced the F max of NO 3 − uptake by 38 % and the N concentration of the plants by 35 %”
Claim · model-written summary
Salinity reduced root nitrogen concentration by 16% in ammonium-fed plants.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Organ / stage
- roote0
- Treatment
- a salinity of 50 mMe0
- Outcome
- N concentratione0
- Direction
- reductione0
- Value
- 16 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a salinity of 50 mM resulted in a reduction in the N concentration by 16 % (only in the root)”
t0“Triticum aestivum L.”
Claim · model-written summary
Salinity reduced maximum ammonium uptake by 50%.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- F max of NH 4 + uptakee0
- Direction
- reductione0
- Value
- 50 %e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a reduction in the F max of NH 4 + uptake by 50 %”
t0“Triticum aestivum L.”
Claim · model-written summary
Salinity reduced plant nitrogen uptake rate by 16% in ammonium-fed plants.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- N uptake rate by the plante0
- Direction
- reducede0
- Value
- 16 %e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the N uptake rate by the plant was reduced by 16 %”
t0“Triticum aestivum L.”
Claim · model-written summary
Calcium increased maximum nitrate uptake by 65% in salt-stressed nitrate-fed wheat.
- Taxon
- wheatTriticum aestivume0
- Treatment
- an exogenous Ca 24 concentration of 5 mMe0
- Outcome
- V max of NO 3 − uptakee0
- Direction
- increasee0
- Value
- 65 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In salt‐stressed NO 3 − supplied wheat, an exogenous Ca 24 concentration of 5 mM resulted in a 65 % increase in V max of NO 3 − uptake”
Claim · model-written summary
Calcium increased shoot nitrate uptake rate per gram root by 58%.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- NO 3 − uptake rate by the shoot per g roote0
- Direction
- increasee0
- Value
- 58%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 58% increase in NO 3 − uptake rate by the shoot per g root”
t0“Triticum aestivum L.”
Claim · model-written summary
Calcium increased shoot nitrogen concentration by 61%.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- shoot and root N concentratione0
- Direction
- increasee0
- Value
- 61e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 61 and 5 % increase in shoot and root N concentration respectively”
t0“Triticum aestivum L.”
Claim · model-written summary
Calcium increased root nitrogen concentration by 5%.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- root N concentratione0
- Direction
- increasee0
- Value
- 5 %e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 61 and 5 % increase in shoot and root N concentration respectively”
t0“Triticum aestivum L.”
Claim · model-written summary
Higher calcium had no effect on ammonium uptake.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- Ca 2+e0
- Outcome
- NH 4 + uptakee0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased exogenous concentrations of either Ca 2+ or K + had no effect on NH 4 + uptake.”
t0“Triticum aestivum L.”
Claim · model-written summary
Higher potassium had no effect on ammonium uptake.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- K +e0
- Outcome
- NH 4 + uptakee0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased exogenous concentrations of either Ca 2+ or K + had no effect on NH 4 + uptake.”
t0“Triticum aestivum L.”
Claim · model-written summary
Kinetic calculations characterized NaCl inhibition of nitrate uptake as noncompetitive.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- NaCle0
- Outcome
- NO 3 − and NH 4 + uptakee0
- Qualifier
- noncompetitive inhibitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetic calculations indicate that the inhibitory activity of NaCl on both NO 3 − and NH 4 + uptake was one of noncompetitive inhibition.”
t0“Triticum aestivum L.”
Claim · model-written summary
Kinetic calculations characterized NaCl inhibition of ammonium uptake as noncompetitive.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- NaCle0
- Outcome
- NH 4 + uptakee0
- Qualifier
- noncompetitive inhibitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetic calculations indicate that the inhibitory activity of NaCl on both NO 3 − and NH 4 + uptake was one of noncompetitive inhibition.”
t0“Triticum aestivum L.”
Claim · model-written summary
Calcium partly ameliorated salt inhibition of nitrate uptake when nitrate was the nitrogen source.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- Ca 2+ at a concentration of 5 mMe0
- Outcome
- NaCl‐mediated inhibition of NO 3 − uptakee0
- Direction
- partially amelioratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When NO 3 − , but not NH 4 + , was the N source, Ca 2+ at a concentration of 5 mM partially ameliorated the NaCl‐mediated inhibition of NO 3 − uptake.”
t0“Triticum aestivum L.”
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