Abstract
SUMMARY The effect on excised wheat coleoptiles of solutions of ethylenediaminetetraacetic acid, at concentrations which produce a significant growth response in segments of this tissue, was investigated. The removal not only of calcium ions, but also of pectin, from coleoptiles by these solutions of the chelator was demonstrated and the implications of these findings are discussed. An increase in the plasticity of the cell walls is considered to arise from the removal of both of these constituents, and the small extension of the coleoptile segments to be a direct consequence of these changes. The concentration of EDTA required to give either the growth‐regulating response or to cause the loss of pectin and calcium was shown to approach that which also caused visible signs of toxicity, and this was taken as further support for the ‘subacute toxicity’ theory put forward earlier by Fawcett, Wain & Wightman.
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Claims 5
Claim · model-written summary
EDTA solutions removed not only calcium ions but also pectin from wheat coleoptiles.
- Taxon
- wheat
Triticum aestivumt0 - Organ / stage
- coleoptilese1
- Treatment
- these solutions of the chelatore1
- Outcome
- removal not only of calcium ions, but also of pectine1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat coleoptile tissue”
e1“The removal not only of calcium ions, but also of pectin, from coleoptiles by these solutions of the chelator was demonstrated”
Claim · model-written summary
EDTA concentrations that produce a significant growth response in wheat coleoptile segments.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- solutions of ethylenediaminetetraacetic acide2
- Outcome
- growth response in segmentse2
- Direction
- producee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat coleoptile tissue”
e2“solutions of ethylenediaminetetraacetic acid, at concentrations which produce a significant growth response in segments of this tissue”
Claim · model-written summary
Cell wall plasticity increased in wheat coleoptiles, considered to arise from removal of calcium and pectin.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- increase in the plasticity of the cell wallse3
- Qualifier
- removal of both of these constituentse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat coleoptile tissue”
e3“An increase in the plasticity of the cell walls is considered to arise from the removal of both of these constituents”
Claim · model-written summary
The small extension of wheat coleoptile segments is considered a direct consequence of the cell wall changes.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- small extension of the coleoptile segmentse4
- Qualifier
- a direct consequence of these changese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat coleoptile tissue”
e4“the small extension of the coleoptile segments to be a direct consequence of these changes”
Claim · model-written summary
The EDTA concentration giving the growth response approached the concentration causing visible signs of toxicity.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- solutions of ethylenediaminetetraacetic acide2
- Outcome
- visible signs of toxicitye5
- Qualifier
- approach that which also causede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat coleoptile tissue”
e2“solutions of ethylenediaminetetraacetic acid, at concentrations which produce a significant growth response in segments of this tissue”
e5“or to cause the loss of pectin and calcium was shown to approach that which also caused visible signs of toxicity”
The same questions in other papers
ethylenediaminetetraacetic acid · growth · Triticum aestivum (wheat)Results differ
5 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
5 papers more in this group
See all 9 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.