Abstract
When segments are excised from corn (Zea mays L.) coleoptiles they exhibit a very low rate of elongation for about 3.5 hours. A strong increase in growth rate (the spontaneous growth response) then occurs and persists for many hours. During the latent period preceding the spontaneous growth response there is an apparent increase with time in the sensitivity of the segments to indoleacetic acid (IAA). This increase in sensitivity is expressed as a 2- to 3-fold increase in the magnitude of the growth response to low levels of IAA and a 3-fold decrease in the latent period of the response during the first 3 hours following excision. A similar increase in sensitivity to low levels of IAA is noted if application of IAA is timed from the point of termination of a previous exposure to the hormone. Since the increase in responsiveness to low levels of IAA is not paralleled by an increase in the rate of uptake of the hormone, the data may be interpreted as evidence for a type of time-dependent sensory adaptation to auxin. The IAA dose-response relationship also changes with time, and there is indirect evidence that an auxin-dependent inhibitor may influence the expression of the apparent sensory adaptation to auxin.
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Claims 9
Claim · model-written summary
Excised corn coleoptiles had low elongation for about 3.5 hours.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“segments are excised from corn (Zea mays L.) coleoptiles they exhibit a very low rate of elongation for about 3.5 hours”
Claim · model-written summary
Growth rate then increased strongly and persisted for many hours.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A strong increase in growth rate (the spontaneous growth response) then occurs and persists for many hours”
t0“corn (Zea mays L.)”
Claim · model-written summary
Sensitivity to IAA increased over the latent period.
- Compound
- indoleacetic acid (IAA)e0
- Outcome
- sensitivity of the segments to indoleacetic acid (IAA)e0
- Direction
- increasee0
- Qualifier
- latent periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the latent period preceding the spontaneous growth response there is an apparent increase with time in the sensitivity of the segments to indoleacetic acid (IAA)”
t0“corn (Zea mays L.)”
Claim · model-written summary
The growth response to low IAA increased two to threefold in the first three hours.
- Compound
- IAAe0
- Outcome
- magnitude of the growth response to low levels of IAAe0
- Direction
- increasee0
- Value
- 2- to 3-folde0
- Qualifier
- first 3 hours following excisione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 2- to 3-fold increase in the magnitude of the growth response to low levels of IAA and a 3-fold decrease in the latent period of the response during the first 3 hours following excision”
t0“corn (Zea mays L.)”
Claim · model-written summary
The response latency decreased threefold in the first three hours.
- Treatment
- excisione0
- Outcome
- latent period of the responsee0
- Direction
- decreasee0
- Value
- 3-folde0
- Qualifier
- first 3 hours following excisione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 3-fold decrease in the latent period of the response during the first 3 hours following excision”
t0“corn (Zea mays L.)”
Claim · model-written summary
Sensitivity to low IAA rose after an earlier hormone exposure ended.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A similar increase in sensitivity to low levels of IAA is noted if application of IAA is timed from the point of termination of a previous exposure to the hormone”
t0“corn (Zea mays L.)”
Claim · model-written summary
IAA uptake rate did not rise with responsiveness.
- Outcome
- rate of uptake of the hormonee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increase in responsiveness to low levels of IAA is not paralleled by an increase in the rate of uptake of the hormone”
t0“corn (Zea mays L.)”
Claim · model-written summary
IAA dose response changed with time.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The IAA dose-response relationship also changes with time”
t0“corn (Zea mays L.)”
Claim · model-written summary
An auxin dependent inhibitor may influence sensory adaptation.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is indirect evidence that an auxin-dependent inhibitor may influence the expression of the apparent sensory adaptation to auxin”
t0“corn (Zea mays L.)”