Abstract
Abstract Corn ( Zea mays ) was grown in nutrient solutions of pH 5.2 and 7.5 with EDTA (ethylenediaminetetraacetic acid) and DTPA (diethylenetriaminepentaacetic acid) as chelating agents. At pH 5.2, corn plants were healthy and fully green, but at pH 7.5, the nutrient solutions with DTPA produced severely stunted, Zn‐deficient plants. Spraying the foliage with Zn or increasing the level of ZnSO 4 added to the nutrient solution prevented Zn deficiency. A concentration of 10 −10.6 M Zn 2+ was sufficient to prevent Zn deficiency with corn. Even at 10 5 times this concentration, chelated Zn was not absorbed by the roots. Equilibrium relationships of chelating agents in hydroponic solutions were extremely helpful in interpreting the results of this study. The findings reported herein support the hypothesis that Zn 2+ is the form of Zn absorbed by plant roots. Furthermore, plants can obtain adequate Zn from a nutrient media when Zn 2+ is maintained at approximately 10 −10.6 M . This concentration is nearly 4,000 times lower than the 10 −7 M reported by Carroll and Loneragan. The hypothesis proposed herein is that chelation aids in the transport and movement of metal ions to plant roots, but only Zn 2+ is absorbed.
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Claims 7
Claim · model-written summary
At pH 5.2, corn plants were healthy and green.
- Taxon
- corn
Zea mays subsp. mayse0 - Outcome
- healthy and fully greene0
- Qualifier
- pH 5.2e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At pH 5.2, corn plants were healthy and fully green”
Claim · model-written summary
At pH 7.5, DTPA solutions produced stunted zinc-deficient corn plants.
- Taxon
- CornZea mays subsp. mayse1
- Treatment
- nutrient solutions with DTPAe0
- Outcome
- severely stunted, Zn‐deficient plantse0
- Qualifier
- pH 7.5e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at pH 7.5, the nutrient solutions with DTPA produced severely stunted, Zn‐deficient plants”
e1“Corn ( Zea mays )”
Claim · model-written summary
Foliar zinc prevented zinc deficiency in corn.
- Taxon
- CornZea mays subsp. mayse1
- Treatment
- Spraying the foliage with Zne0
- Outcome
- Zn deficiencye0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spraying the foliage with Zn or increasing the level of ZnSO 4 added to the nutrient solution prevented Zn deficiency”
e1“Corn ( Zea mays )”
Claim · model-written summary
Increasing ZnSO 4 in nutrient solution prevented zinc deficiency in corn.
- Taxon
- CornZea mays subsp. mayse1
- Treatment
- increasing the level of ZnSO 4 added to the nutrient solutione0
- Outcome
- Zn deficiencye0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spraying the foliage with Zn or increasing the level of ZnSO 4 added to the nutrient solution prevented Zn deficiency”
e1“Corn ( Zea mays )”
Claim · model-written summary
A Zn 2+ concentration of 10 −10.6 M prevented corn zinc deficiency.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- Zn deficiencye0
- Direction
- prevente0
- Value
- 10 −10.6 Me0
- Qualifier
- sufficiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A concentration of 10 −10.6 M Zn 2+ was sufficient to prevent Zn deficiency with corn”
Claim · model-written summary
Corn roots did not absorb chelated zinc even at 10 5 times the sufficient concentration.
- Taxon
- CornZea mays subsp. mayse1
- Outcome
- chelated Zn was not absorbed by the rootse0
- Value
- 10 5 times this concentratione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Even at 10 5 times this concentration, chelated Zn was not absorbed by the roots”
e1“Corn ( Zea mays )”
Claim · model-written summary
The findings support Zn 2+ as the zinc form absorbed by corn roots.
- Taxon
- CornZea mays subsp. mayse1
- Compound
- Zn 2+e0
- Outcome
- form of Zn absorbed by plant rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn 2+ is the form of Zn absorbed by plant roots”
e1“Corn ( Zea mays )”
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