Abstract
Measurements of the time course of growth responses of corn coleoptile sections to pulses of auxin (10(-5)m indoleacetic acid) establish that the growth rate changes in a regular pattern around the auxin pulse: a latent phase of 12 to 15 minutes is followed by an acceleration of growth rate lasting 15 to 20 minutes, after which a fairly steady rate is maintained. When the auxin source is withdrawn, there is an after-effect of about 15 minutes followed by a decay of growth rate, which reaches 50% decay after a further 15 to 40 minutes. The decay phase appears to be a function of the transport of auxin out of the sections. The 50% decay of growth for single cells is estimated at 30 minutes from the time of withdrawal of an exogenous supply of auxin. The regulation of growth by auxin is rapidly imposed or dissipated as auxin enters and exits, respectively, suggesting a facile association and disassociation of auxin with a growth-limiting site in the cell. It is proposed that the growth-stimulated state is dissipated at once when the transportable auxin has passed out of the cell.
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Claims 8
Claim · model-written summary
Corn coleoptile sections showed a latent phase of 12 to 15 minutes after an auxin pulse.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- pulses of auxin (10(-5)m indoleacetic acid)e0
- Outcome
- latent phasee1
- Value
- 12 to 15 minutese1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn coleoptile sections to pulses of auxin (10(-5)m indoleacetic acid)”
e1“a latent phase of 12 to 15 minutes”
Claim · model-written summary
The latent phase was followed by an acceleration of growth rate lasting 15 to 20 minutes, after which a fairly steady rate was maintained.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- pulses of auxin (10(-5)m indoleacetic acid)e0
- Outcome
- acceleration of growth ratee1
- Direction
- acceleratione1
- Value
- 15 to 20 minutese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn coleoptile sections to pulses of auxin (10(-5)m indoleacetic acid)”
e1“an acceleration of growth rate lasting 15 to 20 minutes”
Claim · model-written summary
After auxin withdrawal there was an after-effect of about 15 minutes.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- the auxin source is withdrawne1
- Outcome
- after-effecte1
- Value
- about 15 minutese1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn coleoptile sections to pulses of auxin (10(-5)m indoleacetic acid)”
e1“the auxin source is withdrawn, there is an after-effect of about 15 minutes”
Claim · model-written summary
Growth rate decay reached 50% after a further 15 to 40 minutes following the after-effect.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- pulses of auxin (10(-5)m indoleacetic acid)e0
- Outcome
- decay of growth ratee1
- Direction
- decaye1
- Value
- 50% decay after a further 15 to 40 minutese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn coleoptile sections to pulses of auxin (10(-5)m indoleacetic acid)”
e1“a decay of growth rate, which reaches 50% decay after a further 15 to 40 minutes”
Claim · model-written summary
The decay phase appears to be a function of auxin transport out of the sections.
- Taxon
- cornZea mays subsp. mayse0
- Compound
- auxine1
- Outcome
- decay phasee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn coleoptile sections to pulses of auxin (10(-5)m indoleacetic acid)”
e1“The decay phase appears to be a function of the transport of auxin out of the sections”
Claim · model-written summary
The 50% decay of growth for single cells is estimated at 30 minutes from the withdrawal of exogenous auxin.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- 50% decay of growth for single cellse1
- Value
- 30 minutese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn coleoptile sections to pulses of auxin (10(-5)m indoleacetic acid)”
e1“The 50% decay of growth for single cells is estimated at 30 minutes”
Claim · model-written summary
The authors suggest that growth regulation by auxin is rapidly imposed and dissipated as auxin enters and exits, implying a facile association and disassociation with a growth-limiting site.
- Taxon
- cornZea mays subsp. mayse0
- Compound
- auxine1
- Outcome
- regulation of growthe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn coleoptile sections to pulses of auxin (10(-5)m indoleacetic acid)”
e1“The regulation of growth by auxin is rapidly imposed or dissipated as auxin enters and exits, respectively”
Claim · model-written summary
It is proposed that the growth-stimulated state is dissipated at once when transportable auxin has passed out of the cell.
- Taxon
- cornZea mays subsp. mayse0
- Compound
- auxine1
- Outcome
- growth-stimulated state is dissipatede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn coleoptile sections to pulses of auxin (10(-5)m indoleacetic acid)”
e1“the growth-stimulated state is dissipated at once when the transportable auxin has passed out of the cell”
The same questions in other papers
indole-3-acetic acid · growth · Zea mays (maize)Results differ
34 papers in the same direction as this paper · 6 in the opposite direction
- negative
- negative
- no effect
37 papers more in this group
See all 41 papers →class · growth · Zea mays (maize)Positive and negative results
52 papers in the same direction as this paper · 15 in the opposite direction
- negative
- negative
- no effect
64 papers more in this group
See all 68 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.