Abstract
The interfering effects of copper, zinc, and cobalt on the uptake of mugineic acid‐ferric complex were studied in barley ( Hordeum vulgare , cv. Minorimugi) grown in nutrient solution. Short‐term uptake experiments of 3 h were performed utilizing both ionic and mugineic acid‐complex forms of each metal at two different concentrations. Copper was most effective in decreasing iron uptake when added in an ionic form at either concentration. The inhibition order at higher concentrations followed Cu(II) > Zn(II) ≥ Co(II), Co(III), which is consistent with the stability constants of these metal complexes with mugineic acid. The displacement of iron from its mugineic acid complex by these metals is suggested as a probable explanation for the decreased iron uptake. The inhibitory effect of metal complexes with mugineic acid on iron uptake was only found in cases with higher concentrations of Cu(II) and Zn(II) complexes. Deformation of the specific iron transport system in the plasma membrane due to their adsorption may be responsible for this effect.
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Claims 5
Claim · model-written summary
Ionic copper most effectively decreased iron uptake at either concentration.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- Coppere0
- Outcome
- iron uptakee0
- Direction
- decreasinge0
- Qualifier
- in an ionic form at either concentratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Copper was most effective in decreasing iron uptake when added in an ionic form at either concentration.”
t0“barley”
Claim · model-written summary
At higher concentrations, inhibition ranked Cu(II) above Zn(II), which was at least as high as Co(II) and Co(III).
- Taxon
- barleyHordeum vulgaret0
- Outcome
- inhibition ordere0
- Qualifier
- higher concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibition order at higher concentrations followed Cu(II) > Zn(II) ≥ Co(II), Co(III)”
t0“barley”
Claim · model-written summary
Displacement of iron from its mugineic acid complex was suggested to explain decreased iron uptake.
- Taxon
- barleyHordeum vulgaret0
- Compound
- mugineic acid complexe0
- Outcome
- decreased iron uptakee0
- Qualifier
- suggested as a probable explanatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The displacement of iron from its mugineic acid complex by these metals is suggested as a probable explanation for the decreased iron uptake.”
t0“barley”
Claim · model-written summary
Only higher concentrations of Cu(II) and Zn(II) mugineic acid complexes inhibited iron uptake.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Cu(II) and Zn(II) complexese0
- Outcome
- iron uptakee0
- Direction
- inhibitorye0
- Qualifier
- higher concentrationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibitory effect of metal complexes with mugineic acid on iron uptake was only found in cases with higher concentrations of Cu(II) and Zn(II) complexes.”
t0“barley”
Claim · model-written summary
Adsorption-related deformation of an iron transport system was proposed to explain the inhibitory effect.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- this effecte0
- Qualifier
- Deformation of the specific iron transport system in the plasma membrane due to their adsorptione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deformation of the specific iron transport system in the plasma membrane due to their adsorption may be responsible for this effect.”
t0“barley”
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