Abstract
Sodium is a beneficial mineral for some plant species when external concentrations are low. The role of Na+ in energising K+ acquisition in terrestrial plants has recently been suggested because of evidence demonstrating that wheat root cells express a high-affinity Na+-energised K+ symporter. To determine whether low concentrations of Na+ improve the K+ nutrition and growth of wheat, long-term growth and short-term tracer flux experiments were conducted. Long-term growth experiments were conducted over a range of K+ concentrations, at acidic and alkaline pH, with and without 500 µM NaCl. Plant biomass and tissue Na+ and K+ content was measured. Short-term experi-ments were conducted using tracers to determine whether low concentrations of Na+ or K+ stimulate Rb+ or Na+ uptake, respectively. Sodium stimulated the growth of wheat only at low (20 µM) external K+ in one of the long-term experiments, but not in two other experiments. Na+ did not stimulate Rb+ uptake, but K+ stimulated Na+ uptake in short-term tracer flux experiments. The results suggest that low concentrations of Na+ do not increase K+ uptake to a large extent, and only when light levels are low does Na+ have a beneficial effect on the growth of wheat.
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Claims 6
Claim · model-written summary
Sodium stimulated wheat growth only at low external potassium in one long-term experiment.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- Sodiume0
- Outcome
- growth of wheate0
- Direction
- stimulatede0
- Qualifier
- low (20 µM) external K+ in one of the long-term experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sodium stimulated the growth of wheat only at low (20 µM) external K+ in one of the long-term experiments, but not in two other experiments”
Claim · model-written summary
Sodium did not stimulate wheat growth in two other experiments.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Sodiume0
- Outcome
- growth of wheate0
- Direction
- note0
- Qualifier
- two other experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sodium stimulated the growth of wheat only at low (20 µM) external K+ in one of the long-term experiments, but not in two other experiments”
Claim · model-written summary
Sodium did not stimulate rubidium uptake in wheat.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Na+e0
- Outcome
- Rb+ uptakee0
- Direction
- did not stimulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Na+ did not stimulate Rb+ uptake”
t0“wheat”
Claim · model-written summary
Potassium stimulated sodium uptake in wheat.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- K+e0
- Outcome
- Na+ uptakee0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K+ stimulated Na+ uptake in short-term tracer flux experiments”
t0“wheat”
Claim · model-written summary
The authors conclude low sodium concentrations do not greatly increase wheat potassium uptake.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- low concentrations of Na+e0
- Outcome
- K+ uptakee0
- Direction
- do not increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low concentrations of Na+ do not increase K+ uptake to a large extent”
t0“wheat”
Claim · model-written summary
The authors conclude sodium benefits wheat growth only under low light.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Na+e0
- Outcome
- growth of wheate0
- Qualifier
- only when light levels are lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only when light levels are low does Na+ have a beneficial effect on the growth of wheat”
The same questions in other papers
sodium atom · growth · Triticum aestivum (wheat)Positive and negative results
8 papers in the same direction as this paper · 5 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- no effect
11 papers more in this group
See all 15 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.