Abstract
Abstract Iron and Zn absorption, interactions, and Cu inhibitions were characterized in cucumber (Cucumis sativus L.), watermelon (Citrullus lanatus Thunb.), and pumpkin (Cucurbita moschata Poir.) by kinetic parameters Vmax and Km. Influx and Vmax values for Fe and Zn absorption decreased in each species as plant age increased. For the Michaelis constant, Km, Fe values in cucumber and watermelon and Zn values in watermelon and pumpkin were relatively unchanged with increased plant age. Km values for Zn absorption in cucumber and Fe absorption in pumpkin decreased as plant age increased. Among species, watermelon appeared to have a particularly effective uptake mechanism for Zn at low solution concentrations. Non‐competitive inhibition of Zn absorption by Fe (20, 50 uM) was indicated in each species. Iron uptake in pumpkin was inhibited non‐competitively by Zn (5, 10 uM), however no significant effects of Zn on Fe absorption were evident in either watermelon or cucumber. Copper (0.5, 1, 5 uM) inhibited uptake of Fe non‐competitively and Zn competitively in each species.
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Claims 20
Claim · model-written summary
Fe influx and Vmax declined with plant age in cucumber.
- Taxon
- cucumber
Cucumis sativuse1 - Organ / stage
- plant agee0
- Outcome
- Influx and Vmax valuese0
- Direction
- decreasede0
- Qualifier
- Fee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influx and Vmax values for Fe and Zn absorption decreased in each species as plant age increased”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
Zn influx and Vmax declined with plant age in cucumber.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- plant agee0
- Outcome
- Influx and Vmax valuese0
- Direction
- decreasede0
- Qualifier
- Zne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influx and Vmax values for Fe and Zn absorption decreased in each species as plant age increased”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
Fe influx and Vmax declined with plant age in watermelon.
- Taxon
- watermelon
Citrullus lanatuse1 - Organ / stage
- plant agee0
- Outcome
- Influx and Vmax valuese0
- Direction
- decreasede0
- Qualifier
- Fee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influx and Vmax values for Fe and Zn absorption decreased in each species as plant age increased”
e1“watermelon (Citrullus lanatus Thunb.)”
Claim · model-written summary
Zn influx and Vmax declined with plant age in watermelon.
- Taxon
- watermelonCitrullus lanatuse1
- Organ / stage
- plant agee0
- Outcome
- Influx and Vmax valuese0
- Direction
- decreasede0
- Qualifier
- Zne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Influx and Vmax values for Fe and Zn absorption decreased in each species as plant age increased”
e1“watermelon (Citrullus lanatus Thunb.)”
Claim · model-written summary
Fe influx and Vmax declined with plant age in pumpkin.
Verbatim
e0“Influx and Vmax values for Fe and Zn absorption decreased in each species as plant age increased”
e1“pumpkin (Cucurbita moschata Poir.)”
Claim · model-written summary
Zn influx and Vmax declined with plant age in pumpkin.
Verbatim
e0“Influx and Vmax values for Fe and Zn absorption decreased in each species as plant age increased”
e1“pumpkin (Cucurbita moschata Poir.)”
Claim · model-written summary
Fe absorption Km in cucumber was relatively unchanged with age.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- plant agee0
- Outcome
- Kme0
- Direction
- relatively unchangede0
- Qualifier
- Fee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Km, Fe values in cucumber and watermelon and Zn values in watermelon and pumpkin were relatively unchanged with increased plant age”
Claim · model-written summary
Fe absorption Km in watermelon was relatively unchanged with age.
- Taxon
- watermelonCitrullus lanatuse0
- Organ / stage
- plant agee0
- Outcome
- Kme0
- Direction
- relatively unchangede0
- Qualifier
- Fee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Km, Fe values in cucumber and watermelon and Zn values in watermelon and pumpkin were relatively unchanged with increased plant age”
Claim · model-written summary
Zn absorption Km in watermelon was relatively unchanged with age.
- Taxon
- watermelonCitrullus lanatuse0
- Organ / stage
- plant agee0
- Outcome
- Kme0
- Direction
- relatively unchangede0
- Qualifier
- Zne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Km, Fe values in cucumber and watermelon and Zn values in watermelon and pumpkin were relatively unchanged with increased plant age”
Claim · model-written summary
Zn absorption Km in pumpkin was relatively unchanged with age.
Verbatim
e0“Km, Fe values in cucumber and watermelon and Zn values in watermelon and pumpkin were relatively unchanged with increased plant age”
Claim · model-written summary
Zn absorption Km in cucumber was decreased with age.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Km values for Zn absorption in cucumber and Fe absorption in pumpkin decreased as plant age increased”
Claim · model-written summary
Fe absorption Km in pumpkin was decreased with age.
Verbatim
e0“Km values for Zn absorption in cucumber and Fe absorption in pumpkin decreased as plant age increased”
Claim · model-written summary
Watermelon had effective Zn uptake at low solution concentrations.
- Taxon
- watermelonCitrullus lanatuse0
- Outcome
- uptake mechanism for Zne0
- Qualifier
- low solution concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“watermelon appeared to have a particularly effective uptake mechanism for Zn at low solution concentrations”
Claim · model-written summary
Fe inhibited Zn absorption noncompetitively in cucumber.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Fe (20, 50 uM)e0
- Outcome
- Zn absorptione0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non‐competitive inhibition of Zn absorption by Fe (20, 50 uM) was indicated in each species”
e1“cucumber (Cucumis sativus L.)”
Claim · model-written summary
Fe inhibited Zn absorption noncompetitively in watermelon.
- Taxon
- watermelonCitrullus lanatuse1
- Treatment
- Fe (20, 50 uM)e0
- Outcome
- Zn absorptione0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non‐competitive inhibition of Zn absorption by Fe (20, 50 uM) was indicated in each species”
e1“watermelon (Citrullus lanatus Thunb.)”
Claim · model-written summary
Fe inhibited Zn absorption noncompetitively in pumpkin.
Not reportedComparator
Verbatim
e0“Non‐competitive inhibition of Zn absorption by Fe (20, 50 uM) was indicated in each species”
e1“pumpkin (Cucurbita moschata Poir.)”
Claim · model-written summary
Zn inhibited Fe uptake noncompetitively in pumpkin.
Not reportedComparator
Verbatim
e0“Iron uptake in pumpkin was inhibited non‐competitively by Zn (5, 10 uM)”
Claim · model-written summary
Zn had no significant effect on Fe absorption in watermelon.
- Taxon
- watermelonCitrullus lanatuse0
- Treatment
- Zne0
- Outcome
- Fe absorptione0
- Direction
- no significant effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant effects of Zn on Fe absorption were evident in either watermelon or cucumber”
Claim · model-written summary
Zn had no significant effect on Fe absorption in cucumber.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Zne0
- Outcome
- Fe absorptione0
- Direction
- no significant effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant effects of Zn on Fe absorption were evident in either watermelon or cucumber”
Claim · model-written summary
Copper inhibited Fe uptake non‐competitively in cucumber.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Copper (0.5, 1, 5 uM)e0
- Outcome
- Fee0
- Direction
- inhibitede0
- Qualifier
- non‐competitivelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Copper (0.5, 1, 5 uM) inhibited uptake of Fe non‐competitively and Zn competitively in each species”
e1“cucumber (Cucumis sativus L.)”
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See all 6 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.