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 foUowing 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 10
Claim · model-written summary
Excised corn coleoptiles elongated very slowly for about 3.5 hours.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When 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
A strong spontaneous growth rate increase followed the latent period.
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“Coleoptile”
e1“When 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
Sensitivity of coleoptile segments to indoleacetic acid increased during the latent period.
- Organ / stage
- segmentse0
- 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“Coleoptile”
e1“When 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 response to low IAA levels increased two- to threefold over the first three hours after excision.
- Treatment
- low levels of IAAe0
- Outcome
- magnitude of the growth responsee0
- Direction
- increasee0
- Value
- 2- to 3-folde0
- Qualifier
- first 3 hours foUowing 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 foUowing excision.”
t0“Coleoptile”
e1“When 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
Latent period of IAA response decreased threefold during the first three hours after excision.
- Treatment
- low levels of IAAe0
- Outcome
- latent period of the responsee0
- Direction
- decreasee0
- Value
- 3-folde0
- Qualifier
- first 3 hours foUowing 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 foUowing excision.”
t0“Coleoptile”
e1“When 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
Sensitivity to low IAA levels similarly increased after a previous hormone exposure ended.
- Outcome
- sensitivity to low levels of IAAe0
- Direction
- increasee0
- Qualifier
- termination of a previous exposure to the hormonee0
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“Coleoptile”
e1“When 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
Increased responsiveness to low IAA did not coincide with increased hormone uptake.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase in responsiveness to low levels of IAA is not paralleled by an increase in the rate of uptake of the hormone”
t0“Coleoptile”
e1“When 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
The IAA dose-response relation changed with time.
- Outcome
- IAA dose-response relationshipe0
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“Coleoptile”
e1“When 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
Authors interpret the time-dependent response as sensory adaptation to auxin.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the data may be interpreted as evidence for a type of time-dependent sensory adaptation to auxin.”
t0“Coleoptile”
e1“When 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
Indirect evidence suggests an auxin-dependent inhibitor may influence sensory adaptation.
- Outcome
- expression of the apparent sensory adaptation to auxine0
- Qualifier
- auxin-dependent inhibitor may influencee0
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“Coleoptile”
e1“When segments are excised from corn (Zea mays L.) coleoptiles they exhibit a very low rate of elongation for about 3.5 hours.”