Abstract
Heavy metals are known to induce Fe chlorosis in different plant species. Heavy-metal-induced chlorosis is generally correlated with low plant Fe contents, suggesting effects of heavy metals on Fe mobilization and uptake. Under Fe-deficient conditions, dicotyledonous plants enhance root Fe(lll) reductase activity, thus increasing the capacity to reduce Fe(MI) to Fe(ll), the form in which roots absorb Fe. We studied the effect of several heavy metals (Mn, Pb, Zn, Mo, Ni, Cu, and Cd) on the induction of enhanced root Fe(lll) reductase by 11-d-old Fe-deficient cucumber [Cucumis sativus L. cv. Ashley). The effect of these heavy metals on the function of the induced Fe(lll) reductase was also investigated. Results showed that some heavy metals can inhibit both the induction and function of root Fe(lll) reductase. Ni, at 20//M, and Cu and Cd, at 5 fiM concentration or higher, severely inhibited the induction of root Fe(lll) reductase while Mn, Pb, Zn, and Mo had little effect, even at concentrations higher than 20 //M. Function of the induced root Fe(lll) reductase only was negatively affected by Cu and Ni.
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Claims 9
Claim · model-written summary
Ni severely inhibited induction of cucumber root Fe(lll) reductase at 20//M.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- Ni, at 20//Me0
- Outcome
- induction of root Fe(lll) reductasee0
- Direction
- severely inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni, at 20//M, and Cu and Cd, at 5 fiM concentration or higher, severely inhibited the induction of root Fe(lll) reductase”
t0“Fe-deficient cucumber (Cucumis sativusL.) plants”
Claim · model-written summary
Cu severely inhibited induction of cucumber root Fe(lll) reductase at 5 fiM or above.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Cue0
- Outcome
- induction of root Fe(lll) reductasee0
- Direction
- severely inhibitede0
- Qualifier
- 5 fiM concentration or highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni, at 20//M, and Cu and Cd, at 5 fiM concentration or higher, severely inhibited the induction of root Fe(lll) reductase”
t0“Fe-deficient cucumber (Cucumis sativusL.) plants”
Claim · model-written summary
Cd severely inhibited induction of cucumber root Fe(lll) reductase at 5 fiM or above.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Cde0
- Outcome
- induction of root Fe(lll) reductasee0
- Direction
- severely inhibitede0
- Qualifier
- 5 fiM concentration or highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni, at 20//M, and Cu and Cd, at 5 fiM concentration or higher, severely inhibited the induction of root Fe(lll) reductase”
t0“Fe-deficient cucumber (Cucumis sativusL.) plants”
Claim · model-written summary
Mn had little effect on induction of cucumber root Fe(lll) reductase.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Mne0
- Outcome
- induction and function of root Fe(lll) reductaset0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn, Pb, Zn, and Mo had little effect, even at concentrations higher than 20 //M”
t0“Effects of heavy metals on both induction and function of root Fe(lll) reductase in Fe-deficient cucumber (Cucumis sativusL.) plants”
Claim · model-written summary
Pb had little effect on induction of cucumber root Fe(lll) reductase.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Pbe0
- Outcome
- induction and function of root Fe(lll) reductaset0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn, Pb, Zn, and Mo had little effect, even at concentrations higher than 20 //M”
t0“Effects of heavy metals on both induction and function of root Fe(lll) reductase in Fe-deficient cucumber (Cucumis sativusL.) plants”
Claim · model-written summary
Zn had little effect on induction of cucumber root Fe(lll) reductase.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Zne0
- Outcome
- induction and function of root Fe(lll) reductaset0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn, Pb, Zn, and Mo had little effect, even at concentrations higher than 20 //M”
t0“Effects of heavy metals on both induction and function of root Fe(lll) reductase in Fe-deficient cucumber (Cucumis sativusL.) plants”
Claim · model-written summary
Mo had little effect on induction of cucumber root Fe(lll) reductase.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Moe0
- Outcome
- induction and function of root Fe(lll) reductaset0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn, Pb, Zn, and Mo had little effect, even at concentrations higher than 20 //M”
t0“Effects of heavy metals on both induction and function of root Fe(lll) reductase in Fe-deficient cucumber (Cucumis sativusL.) plants”
Claim · model-written summary
Cu negatively affected function of induced cucumber root Fe(lll) reductase.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Cue0
- Outcome
- Function of the induced root Fe(lll) reductasee0
- Direction
- negatively affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Function of the induced root Fe(lll) reductase only was negatively affected by Cu and Ni”
t0“Fe-deficient cucumber (Cucumis sativusL.) plants”
Claim · model-written summary
Ni negatively affected function of induced cucumber root Fe(lll) reductase.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Nie0
- Outcome
- Function of the induced root Fe(lll) reductasee0
- Direction
- negatively affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Function of the induced root Fe(lll) reductase only was negatively affected by Cu and Ni”
t0“Fe-deficient cucumber (Cucumis sativusL.) plants”
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manganese atom · nutrient: content · Cucumis sativus (cucumber)Positive and negative results
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See all 7 papers →zinc atom · nutrient: content · Cucumis sativus (cucumber)Positive and negative results
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See all 10 papers →nickel atom · molecular: expression · Cucumis sativus (cucumber)Results agree
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copper atom · molecular: expression · Cucumis sativus (cucumber)Results agree
2 papers in the same direction as this paper
- no effect
- no effect
8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.