Abstract
Diffusion towards the root surface has recently been shown to control the uptake of metal ions from solutions. The uptake flux of phosphorus (P) from solutions often approaches the maximal diffusion flux at low external concentrations, suggesting diffusion-controlled uptake also for P. Potential diffusion limitation in P uptake from nutrient solutions was investigated by measuring P uptake of Brassica napus from solutions using P-loaded Al(2) O(3) nanoparticles as mobile P buffer. At constant, low free phosphate concentration, plant P uptake increased up to eightfold and that of passive, diffusion-based samplers up to 40-fold. This study represents the first experimental evidence of diffusion-limited P uptake by plant roots from nutrient solution. The Michaelis constant of the free phosphate ion obtained in unbuffered solutions (K(m) = 10.4 µmol L(-1) ) was 20-fold larger than in the buffered system (K(m) ∼0.5 µmol L(-1) ), indicating that K(m) s determined in unbuffered solutions do not represent the transporter affinity. Increases in the P uptake efficiency of plants by increasing the carrier affinity are therefore unlikely, while increased root surface area or exudation of P-solubilizing compounds are more likely to enhance P uptake. Furthermore, our results highlight the important role natural nanoparticles may have in plant P nutrition.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
At low free phosphate concentration, plant P uptake increased up to eightfold.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse1 - Treatment
- P-loaded Al(2) O(3) nanoparticles as mobile P buffere1
- Outcome
- plant P uptakee0
- Direction
- increasede0
- Value
- up to eightfolde0
- Qualifier
- At constant, low free phosphate concentratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“At constant, low free phosphate concentration, plant P uptake increased up to eightfold”
e1“P uptake of Brassica napus from solutions using P-loaded Al(2) O(3) nanoparticles as mobile P buffer”
Claim · model-written summary
Passive diffusion-based sampler uptake increased up to 40-fold.
- Taxon
- Brassica napusBrassica napuse1
- Treatment
- P-loaded Al(2) O(3) nanoparticles as mobile P buffere1
- Outcome
- passive, diffusion-based samplerse0
- Direction
- increaseinferrede0
- Value
- up to 40-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At constant, low free phosphate concentration, plant P uptake increased up to eightfold and that of passive, diffusion-based samplers up to 40-fold”
e1“P uptake of Brassica napus from solutions using P-loaded Al(2) O(3) nanoparticles as mobile P buffer”
Claim · model-written summary
The study found experimental evidence of diffusion-limited P uptake by plant roots from solution.
- Taxon
- Brassica napusBrassica napuse1
- Organ / stage
- plant rootse0
- Outcome
- diffusion-limited P uptake by plant roots from nutrient solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study represents the first experimental evidence of diffusion-limited P uptake by plant roots from nutrient solution”
e1“P uptake of Brassica napus from solutions”
Claim · model-written summary
The Michaelis constant was 10.4 µmol L(-1) in unbuffered solutions.
- Taxon
- Brassica napusBrassica napuse1
- Outcome
- Michaelis constant of the free phosphate ione0
- Direction
- largere0
- Value
- 10.4 µmol L(-1)e0
- Qualifier
- 20-folde0
- Comparator
- buffered systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Michaelis constant of the free phosphate ion obtained in unbuffered solutions (K(m) = 10.4 µmol L(-1) ) was 20-fold larger than in the buffered system (K(m) ∼0.5 µmol L(-1) )”
e1“P uptake of Brassica napus from solutions”
Claim · model-written summary
The Michaelis constant was approximately 0.5 µmol L(-1) in the buffered system.
- Taxon
- Brassica napusBrassica napuse1
- Outcome
- Michaelis constant of the free phosphate ione0
- Direction
- lowerinferrede0
- Value
- ∼0.5 µmol L(-1)e0
- Comparator
- unbuffered solutionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Michaelis constant of the free phosphate ion obtained in unbuffered solutions (K(m) = 10.4 µmol L(-1) ) was 20-fold larger than in the buffered system (K(m) ∼0.5 µmol L(-1) )”
e1“P uptake of Brassica napus from solutions”
Claim · model-written summary
The authors infer that constants measured in unbuffered solutions do not represent transporter affinity.
- Taxon
- Brassica napusBrassica napuse1
- Outcome
- do not represent the transporter affinitye0
- Qualifier
- unbuffered solutionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K(m) s determined in unbuffered solutions do not represent the transporter affinity”
e1“P uptake of Brassica napus from solutions”
Claim · model-written summary
Increasing carrier affinity is unlikely to improve plant P uptake efficiency.
- Taxon
- Brassica napusBrassica napuse1
- Outcome
- P uptake efficiency of plantse0
- Qualifier
- increasing the carrier affinitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases in the P uptake efficiency of plants by increasing the carrier affinity are therefore unlikely”
e1“P uptake of Brassica napus from solutions”
Claim · model-written summary
Increasing root surface area is more likely to enhance P uptake.
- Taxon
- Brassica napusBrassica napuse1
- Organ / stage
- roote0
- Outcome
- enhance P uptakee0
- Qualifier
- increased root surface areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased root surface area or exudation of P-solubilizing compounds are more likely to enhance P uptake”
e1“P uptake of Brassica napus from solutions”
Claim · model-written summary
Exudation of P-solubilizing compounds is more likely to enhance P uptake.
- Taxon
- Brassica napusBrassica napuse1
- Outcome
- enhance P uptakee0
- Qualifier
- exudation of P-solubilizing compoundse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased root surface area or exudation of P-solubilizing compounds are more likely to enhance P uptake”
e1“P uptake of Brassica napus from solutions”
Claim · model-written summary
Natural nanoparticles may have an important role in plant P nutrition.
- Taxon
- Brassica napusBrassica napuse1
- Outcome
- plant P nutritione0
- Qualifier
- natural nanoparticlese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“our results highlight the important role natural nanoparticles may have in plant P nutrition”
e1“P uptake of Brassica napus from solutions”
The same questions in other papers
nanoparticle · nutrient: content · Brassica napus (oilseed rape)Results agree
7 papers in the same direction as this paper
- positive
- positive
- positive
4 papers more in this group
See all 8 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.