Abstract
The effects of different chemical forms of copper – ionic (CuSO4) and chelated one [Cu(II)HEDTA], applied at micromolar concentrations, on the plasma membrane reductase activity (RA) and proton release in intact roots of cucumber plants grown hydroponically under iron deficiency were studied. Iron starvation provoked high induction of ferric-chelate reductase activity (substrates Fe(III)HEDTA and Fe(III)Citrate) and accelerated cupric-chelate reductase activity (measured with Cu(II)HEDTA and Cu(II)Citrate as electron acceptors), as well as hexacyanoferrate III RA (HCF III). Short-term application of cupric ions in the nutrient solution of irondeficient plants resulted in a dramatic inhibition of Fe(III)HEDTA RA and Cu(II)Citrate RA and stopped H+ release by intact roots. The reductase activity of iron-deficient cucumber roots, measured with HCF III, Fe(III)Citrate or Cu(II)HEDTA, however, was inhibited to a lower extent after cupric ions treatment. In addition, cupric-chelate Cu(II)HEDTA, applied at the same concentration in the nutrient solution of iron-deficient (–Fe) cucumber plants maintained the high stimulation of plasma membrane ferric-chelate RA, enhanced proton release by intact roots and produced additional acceleration of cupric-chelate RA and HCF III reduction in the roots. Application of cupric chelate Cu(II)HEDTA improved the iron-deficiency stress responses of cucumber plants.
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Claims 10
Claim · model-written summary
Iron starvation strongly induced ferric-chelate reductase activity.
- Taxon
- CUCUMBER
Cucumis sativust0 - Treatment
- Iron starvatione0
- Outcome
- ferric-chelate reductase activitye0
- Direction
- high inductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER PLANTS”
e0“Iron starvation provoked high induction of ferric-chelate reductase activity (substrates Fe(III)HEDTA and Fe(III)Citrate)”
Claim · model-written summary
Iron starvation accelerated cupric-chelate reductase activity.
- Taxon
- CUCUMBERCucumis sativust0
- Treatment
- Iron starvatione0
- Outcome
- cupric-chelate reductase activitye0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER PLANTS”
e0“Iron starvation provoked high induction of ferric-chelate reductase activity (substrates Fe(III)HEDTA and Fe(III)Citrate) and accelerated cupric-chelate reductase activity (measured with Cu(II)HEDTA and Cu(II)Citrate as electron acceptors)”
Claim · model-written summary
Iron starvation induced hexacyanoferrate III reductase activity.
- Taxon
- CUCUMBERCucumis sativust0
- Treatment
- Iron starvatione0
- Outcome
- hexacyanoferrate III RA (HCF III)e0
- Direction
- increaseinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER PLANTS”
e0“Iron starvation provoked high induction of ferric-chelate reductase activity (substrates Fe(III)HEDTA and Fe(III)Citrate) and accelerated cupric-chelate reductase activity (measured with Cu(II)HEDTA and Cu(II)Citrate as electron acceptors), as well as hexacyanoferrate III RA (HCF III)”
Claim · model-written summary
Cupric ions dramatically inhibited Fe(III)HEDTA reductase activity.
- Taxon
- CUCUMBERCucumis sativust0
- Treatment
- cupric ionse0
- Outcome
- Fe(III)HEDTA RAe0
- Direction
- dramatic inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER PLANTS”
e0“Short-term application of cupric ions in the nutrient solution of irondeficient plants resulted in a dramatic inhibition of Fe(III)HEDTA RA and Cu(II)Citrate RA”
Claim · model-written summary
Cupric ions dramatically inhibited Cu(II)Citrate reductase activity.
- Taxon
- CUCUMBERCucumis sativust0
- Treatment
- cupric ionse0
- Outcome
- Cu(II)Citrate RAe0
- Direction
- dramatic inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER PLANTS”
e0“Short-term application of cupric ions in the nutrient solution of irondeficient plants resulted in a dramatic inhibition of Fe(III)HEDTA RA and Cu(II)Citrate RA”
Claim · model-written summary
Cupric ions stopped root proton release.
- Taxon
- CUCUMBERCucumis sativust0
- Treatment
- cupric ionse1
- Outcome
- H+ release by intact rootse0
- Direction
- stoppede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER PLANTS”
e0“stopped H+ release by intact roots”
e1“Short-term application of cupric ions in the nutrient solution of irondeficient plants”
Claim · model-written summary
Cupric ions inhibited HCF III reductase activity to a lesser extent.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- cupric ions treatmente0
- Outcome
- reductase activity of iron-deficient cucumber roots, measured with HCF IIIe0
- Direction
- inhibited to a lower extente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER PLANTS”
e0“The reductase activity of iron-deficient cucumber roots, measured with HCF III, Fe(III)Citrate or Cu(II)HEDTA, however, was inhibited to a lower extent after cupric ions treatment.”
Claim · model-written summary
Cupric chelate maintained high ferric-chelate reductase stimulation.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- cupric-chelate Cu(II)HEDTAe0
- Outcome
- plasma membrane ferric-chelate RAe0
- Direction
- maintained the high stimulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER PLANTS”
e0“cupric-chelate Cu(II)HEDTA, applied at the same concentration in the nutrient solution of iron-deficient (–Fe) cucumber plants maintained the high stimulation of plasma membrane ferric-chelate RA”
Claim · model-written summary
Cupric chelate enhanced root proton release.
- Taxon
- CUCUMBERCucumis sativust0
- Treatment
- cupric-chelate Cu(II)HEDTAe1
- Outcome
- proton release by intact rootse0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER PLANTS”
e0“enhanced proton release by intact roots”
e1“cupric-chelate Cu(II)HEDTA, applied at the same concentration”
Claim · model-written summary
Cupric chelate further accelerated cupric-chelate reductase activity and HCF III reduction.
- Taxon
- CUCUMBERCucumis sativust0
- Treatment
- Cu(II)HEDTAe1
- Outcome
- cupric-chelate RA and HCF III reductione0
- Direction
- additional acceleratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CUCUMBER PLANTS”
e0“produced additional acceleration of cupric-chelate RA and HCF III reduction in the roots”
e1“cupric-chelate Cu(II)HEDTA, applied at the same concentration”
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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.