Abstract
Abstract Bush bean and corn plants were grown in nutrient solutions for 21 and 14 days respectively with CaCO3 in the solution to give solution pH of near eight and mild iron deficiency. The bush beans were subjected to excess EDDHA and the com to excess EDTA. Excess EDDHA at 1000 and 100 μmolar resulted in increased Fe in leaves at both 10‐7 and 10‐6 M FeEDDHA and in some of the solutions concentration of Fe2+ would be less than 10‐8 M if pe + pH were 6 or more. If pe + pH were more than 7, concentration of Fe2+ would be even less. Excess EDTA at 1000 and 100 ymolar resulted in no decrease of Fe in shoots of corn for 10‐6 M Fe and the 100 resulted in a slight decrease at 10‐7 M Fe on the per plant basis. Concentration of Fe2+ would be less than 10‐8.8 and 10‐7.8M respectively for 10‐7 and 10‐6 M Fe with the 1000 ymolar excess chelate. The pe + pH would be greater for corn than for bush beans because of less Fe stress response in corn. In another experiment where Fe was not deficient (pe + pH would then be higher), 100 μmolar excess DTPA resulted in increased Fe in bush bean plants grown for 18 days in nutrient solution for solution pH of both pH 4.3 and 7.6. Again concentration of Fe2+ would be 10‐8 M or less with the excess chelate, yet uptake was greater than without the excess chelate where concentration of Fe2+ could be as much as 2 x 10‐5 M especially at the pH of 4.3 (pe + pH would need to be less than 4).
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Claims 10
Claim · model-written summary
Excess EDDHA increased Fe in bush bean leaves at both 10-7 and 10-6 M FeEDDHA.
- Taxon
- bush beanse0
- Treatment
- Excess EDDHAe1
- Outcome
- Fe in leavese1
- Direction
- increasede1
- Setting
- nutrient solutionse2
Not reportedComparator
Verbatim
e0“The bush beans were subjected to excess EDDHA”
e1“Excess EDDHA at 1000 and 100 μmolar resulted in increased Fe in leaves at both 10‐7 and 10‐6 M FeEDDHA”
e2“Bush bean and corn plants were grown in nutrient solutions for 21 and 14 days respectively”
Claim · model-written summary
In some solutions the Fe2+ concentration in bush bean experiments would be below 10-8 M if pe + pH were 6 or more.
Verbatim
e0“Bush bean and corn plants were grown in nutrient solutions for 21 and 14 days respectively”
e1“in some of the solutions concentration of Fe2+ would be less than 10‐8 M if pe + pH were 6 or more”
Claim · model-written summary
If pe + pH were more than 7, the Fe2+ concentration would be even lower.
Verbatim
e0“Bush bean and corn plants were grown in nutrient solutions for 21 and 14 days respectively”
e1“If pe + pH were more than 7, concentration of Fe2+ would be even less”
Claim · model-written summary
Excess EDTA at 1000 and 100 μM did not decrease Fe in corn shoots at 10-6 M Fe.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Excess EDTAe0
- Outcome
- Fe in shootse0
- Direction
- no decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excess EDTA at 1000 and 100 ymolar resulted in no decrease of Fe in shoots of corn for 10‐6 M Fe”
Claim · model-written summary
Excess EDTA at 100 μM slightly decreased Fe on the per plant basis in corn at 10-7 M Fe.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Excess EDTAe0
- Outcome
- Fe on the per plant basise0
- Direction
- slight decreasee0
- Qualifier
- at 10‐7 M Fee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excess EDTA at 1000 and 100 ymolar resulted in no decrease of Fe in shoots of corn for 10‐6 M Fe and the 100 resulted in a slight decrease at 10‐7 M Fe on the per plant basis”
Claim · model-written summary
With 1000 μM excess EDTA the Fe2+ concentration in corn would be below 10-8.8 and 10-7.8 M for 10-7 and 10-6 M Fe.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- Concentration of Fe2+e0
- Direction
- less thane0
- Qualifier
- with the 1000 ymolar excess chelatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentration of Fe2+ would be less than 10‐8.8 and 10‐7.8M respectively for 10‐7 and 10‐6 M Fe with the 1000 ymolar excess chelate”
e1“Excess EDTA at 1000 and 100 ymolar resulted in no decrease of Fe in shoots of corn for 10‐6 M Fe and the 100 resulted in a slight decrease at 10‐7 M Fe on the per plant basis”
Claim · model-written summary
The pe + pH is greater for corn than for bush beans, which the authors attribute to a weaker Fe stress response in corn.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- pe + pHe0
- Qualifier
- less Fe stress response in corne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pe + pH would be greater for corn than for bush beans because of less Fe stress response in corn”
Claim · model-written summary
Excess DTPA at 100 μM increased Fe in bush bean plants at solution pH 4.3 and 7.6, compared with no excess chelate.
Verbatim
e0“100 μmolar excess DTPA resulted in increased Fe in bush bean plants grown for 18 days in nutrient solution for solution pH of both pH 4.3 and 7.6”
e1“uptake was greater than without the excess chelate”
Claim · model-written summary
With excess DTPA the Fe2+ concentration in bush bean experiments would be 10-8 M or less.
Verbatim
e0“Again concentration of Fe2+ would be 10‐8 M or less with the excess chelate”
e1“100 μmolar excess DTPA resulted in increased Fe in bush bean plants grown for 18 days in nutrient solution for solution pH of both pH 4.3 and 7.6”
Claim · model-written summary
Without excess chelate the Fe2+ concentration in bush bean experiments could be as much as 2 x 10-5 M, especially at pH 4.3.
Verbatim
e0“concentration of Fe2+ could be as much as 2 x 10‐5 M especially at the pH of 4.3”
e1“100 μmolar excess DTPA resulted in increased Fe in bush bean plants grown for 18 days in nutrient solution for solution pH of both pH 4.3 and 7.6”
e2“uptake was greater than without the excess chelate”
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- positive
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