Abstract
Abstract The uptake of Fe from FeEDDHA [ferric chelate of ethylenediamine di ( o ‐hydroxyphenylacetic acid)] during periods of 1 to 2 days was studied with 10‐ to 11‐day‐old corn plants ( Zea mays L.) grown in nutrient solutions. The Fe in roots and tops was markedly affected by the composition of the nutrient solution. Cations stimulated Fe in plants in the following order: K> Na > Mg > Ca, and anions SO 4 > Cl > NO 3 . The stimulation was the greater the more the pH declined during the absorption experiment; hence it was concluded that the effect of nutrient solution composition on Fe nutrition must be attributed to the imbalance of cation and anion uptake rather than to a specific nutrient. The pH decline and, in general, the associated stimulation of Fe uptake were enhanced by increasing concentrations of the interfering ions and by time. However, when the pH fell toward a value of 4, injury to roots occurred and Fe uptake was reduced in spite of a higher supply. The composition of the nutrient solution was also effective in long‐term experiments in regulating Fe uptake. A decrease in pH resulting from excess cation uptake favors the formation of less dissociated forms of the free ligand, namely of (ligand‐H) 3‐ , (ligand‐H 2 ) 2‐ , etc., instead of the reactive ligand, (ligand) 4‐ and equilibrium can be maintained only if more FeEDDHA dissociates, liberating Fe 3+ for uptake.
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Claims 11
Claim · model-written summary
Nutrient solution composition markedly affected root and shoot iron.
- Taxon
- corn plants
Zea mays subsp. mayse1 - Treatment
- composition of the nutrient solutione0
- Outcome
- Fe in roots and topse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Fe in roots and tops was markedly affected by the composition of the nutrient solution.”
e1“corn plants ( Zea mays L.)”
Claim · model-written summary
Cations stimulated plant iron in the order potassium, sodium, magnesium, calcium.
- Taxon
- corn plantsZea mays subsp. mayse1
- Treatment
- Cationse0
- Outcome
- Fe in plantse0
- Direction
- stimulatede0
- Qualifier
- K> Na > Mg > Cae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cations stimulated Fe in plants in the following order: K> Na > Mg > Ca”
e1“corn plants ( Zea mays L.)”
Claim · model-written summary
Anions stimulated plant iron in the order sulfate, chloride, nitrate.
- Taxon
- corn plantsZea mays subsp. mayse2
- Treatment
- anionse0
- Outcome
- Fe in plantse1
- Qualifier
- SO 4 > Cl > NO 3e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and anions SO 4 > Cl > NO 3”
e1“Cations stimulated Fe in plants”
e2“corn plants ( Zea mays L.)”
Claim · model-written summary
Greater pH decline was associated with greater iron stimulation.
- Taxon
- corn plantsZea mays subsp. mayse1
- Compound
- pHe0
- Outcome
- stimulatione0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stimulation was the greater the more the pH declined during the absorption experiment”
e1“corn plants ( Zea mays L.)”
Claim · model-written summary
Increasing interfering ion concentrations enhanced pH decline.
- Taxon
- corn plantsZea mays subsp. mayse1
- Treatment
- increasing concentrations of the interfering ionse0
- Outcome
- pH declinee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pH decline and, in general, the associated stimulation of Fe uptake were enhanced by increasing concentrations of the interfering ions and by time.”
e1“corn plants ( Zea mays L.)”
Claim · model-written summary
Increasing interfering ion concentrations generally enhanced iron uptake stimulation.
- Taxon
- corn plantsZea mays subsp. mayse1
- Treatment
- increasing concentrations of the interfering ionse0
- Outcome
- stimulation of Fe uptakee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pH decline and, in general, the associated stimulation of Fe uptake were enhanced by increasing concentrations of the interfering ions and by time.”
e1“corn plants ( Zea mays L.)”
Claim · model-written summary
Longer time enhanced pH decline and associated iron uptake stimulation.
- Taxon
- corn plantsZea mays subsp. mayse1
- Treatment
- interfering ionse0
- Outcome
- pH decline and, in general, the associated stimulation of Fe uptakee0
- Direction
- enhancede0
- Qualifier
- by timee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pH decline and, in general, the associated stimulation of Fe uptake were enhanced by increasing concentrations of the interfering ions and by time.”
e1“corn plants ( Zea mays L.)”
Claim · model-written summary
At about pH 4, root injury occurred.
- Taxon
- corn plantsZea mays subsp. mayse1
- Organ / stage
- rootse0
- Outcome
- injury to roots occurrede0
- Qualifier
- pH fell toward a value of 4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the pH fell toward a value of 4, injury to roots occurred”
e1“corn plants ( Zea mays L.)”
Claim · model-written summary
At about pH 4 iron uptake declined despite higher supply.
- Taxon
- corn plantsZea mays subsp. mayse1
- Outcome
- Fe uptakee0
- Direction
- reducede0
- Qualifier
- in spite of a higher supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the pH fell toward a value of 4, injury to roots occurred and Fe uptake was reduced in spite of a higher supply”
e1“corn plants ( Zea mays L.)”
Claim · model-written summary
Nutrient solution composition regulated long-term iron uptake.
- Taxon
- corn plantsZea mays subsp. mayse1
- Treatment
- composition of the nutrient solutione0
- Outcome
- Fe uptakee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The composition of the nutrient solution was also effective in long‐term experiments in regulating Fe uptake.”
e1“corn plants ( Zea mays L.)”
Claim · model-written summary
The authors attribute iron uptake effects to cation and anion uptake imbalance and ligand dissociation under declining pH.
- Taxon
- corn plantsZea mays subsp. mayse2
- Outcome
- Fe nutritione0
- Qualifier
- imbalance of cation and anion uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of nutrient solution composition on Fe nutrition must be attributed to the imbalance of cation and anion uptake rather than to a specific nutrient”
e1“A decrease in pH resulting from excess cation uptake favors the formation of less dissociated forms of the free ligand”
e2“corn plants ( Zea mays L.)”
The same questions in other papers
cation · nutrient: content · Zea mays (maize)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.