Abstract
SUMMARY The effect of Ca2+, K+ and Na+ on uptake, transport and reduction of NO3- was studied in 10-day-old plants of Triticum aestivum L. cv. Sicco grown in water culture in relation to the ion balance in plant, medium and xylem exudate. When Ca2+ (0-25 mm) was the only nutrient cation, NO3- uptake and accumulation of NO3in the leaves were low as compared to treatments with K+ or Na+ (0 5 mM). With Na+, the uptake of NO3- was similar to that with K+, but virtually no Na+ and 75 % less NO3- accumulated in the leaves. Medium pH dropped initially with 0-5 mM KNO3 but rose immediately when Ca2+ was the only cation. The carboxylate content rose in roots and leaves of K+ plants and, to a lesser extent, in Na+ plants. Roots of Ca(NO3)2 plants showed negative ash alkalinity indicating the presence of acidity. The pH of the xylem exudate increased with the cation/NO3 ratio in the exudate and was about one unit higher with Ca(NO3)2 than with NaNO3 or KNO3. We conclude that roots of plants grown in the absence of monovalent cations have serious pH problems because of a high rate of alkalinity release to the medium in exchange for NO3uptake, and the secretion of alkalinity into the xylem.
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Claims 12
Claim · model-written summary
Calcium alone gave low nitrate uptake relative to potassium or sodium treatments.
- Taxon
- Triticum aestivum L.
Triticum aestivumt0 - Treatment
- Ca2+ (0-25 mm)e0
- Outcome
- NO3- uptakee0
- Direction
- lowe0
- Comparator
- treatments with K+ or Na+ (0 5 mM)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When Ca2+ (0-25 mm) was the only nutrient cation, NO3- uptake and accumulation of NO3in the leaves were low as compared to treatments with K+ or Na+ (0 5 mM)”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Calcium alone gave low leaf nitrate accumulation relative to potassium or sodium.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Organ / stage
- leavese0
- Treatment
- Ca2+ (0-25 mm)e0
- Outcome
- accumulation of NO3in the leavese0
- Direction
- lowe0
- Comparator
- treatments with K+ or Na+ (0 5 mM)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When Ca2+ (0-25 mm) was the only nutrient cation, NO3- uptake and accumulation of NO3in the leaves were low as compared to treatments with K+ or Na+ (0 5 mM)”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Sodium and potassium treatments gave similar nitrate uptake.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- Na+e0
- Outcome
- uptake of NO3-e0
- Direction
- similare0
- Comparator
- K+e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With Na+, the uptake of NO3- was similar to that with K+”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Virtually no sodium accumulated in leaves under sodium treatment.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Organ / stage
- leavese0
- Treatment
- Na+e0
- Outcome
- Na+e0
- Direction
- virtually noe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but virtually no Na+ and 75 % less NO3- accumulated in the leaves”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Leaf nitrate accumulation under sodium was 75% less than with potassium.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Organ / stage
- leavese0
- Treatment
- Na+e0
- Outcome
- NO3- accumulated in the leavese0
- Direction
- lesse0
- Value
- 75 %e0
- Comparator
- K+e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With Na+, the uptake of NO3- was similar to that with K+, but virtually no Na+ and 75 % less NO3- accumulated in the leaves”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Medium pH initially fell with potassium nitrate.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- 0-5 mM KNO3e0
- Outcome
- Medium pHe0
- Direction
- droppede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Medium pH dropped initially with 0-5 mM KNO3”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Medium pH immediately rose when calcium was the only cation.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- Ca2+e0
- Outcome
- Medium pHe0
- Direction
- rosee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Medium pH dropped initially with 0-5 mM KNO3 but rose immediately when Ca2+ was the only cation”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Carboxylate content rose in roots and leaves of potassium-treated wheat.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Organ / stage
- roots and leavese0
- Treatment
- K+e0
- Outcome
- carboxylate contente0
- Direction
- rosee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The carboxylate content rose in roots and leaves of K+ plants”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Carboxylate content rose to a lesser extent in sodium-treated wheat.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- Na+e0
- Outcome
- carboxylate contente0
- Direction
- lessere0
- Comparator
- K+ plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The carboxylate content rose in roots and leaves of K+ plants and, to a lesser extent, in Na+ plants”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Roots of calcium nitrate-treated plants had negative ash alkalinity.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Organ / stage
- Rootse0
- Treatment
- Ca(NO3)2e0
- Outcome
- negative ash alkalinitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roots of Ca(NO3)2 plants showed negative ash alkalinity indicating the presence of acidity”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Xylem exudate pH increased with its cation-to-nitrate ratio.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Organ / stage
- xylem exudatee0
- Compound
- cation/NO3 ratioe0
- Outcome
- pH of the xylem exudatee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pH of the xylem exudate increased with the cation/NO3 ratio in the exudate”
t0“Triticum aestivum L. cv. Sicco”
Claim · model-written summary
Xylem exudate pH was about one unit higher under calcium nitrate than sodium or potassium nitrate.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- Ca(NO3)2e0
- Outcome
- pH of the xylem exudatee0
- Direction
- highere0
- Value
- about one unite0
- Comparator
- NaNO3 or KNO3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pH of the xylem exudate increased with the cation/NO3 ratio in the exudate and was about one unit higher with Ca(NO3)2 than with NaNO3 or KNO3”
t0“Triticum aestivum L. cv. Sicco”
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See all 9 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.