Claim · model-written summary
Growth response to low IAA levels increased two- to threefold over the first three hours after excision.
Zea maysVerbatim
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.”
Title
Time-dependent Changes in the Auxin Sensitivity of Coleoptile
Mary Jo Vesper; Michael L. Evans 1978
Other claims from this paper (9)
- Observation Excised corn coleoptiles elongated very slowly for about 3.5 hours.
- Observation A strong spontaneous growth rate increase followed the latent period.
- Association Sensitivity of coleoptile segments to indoleacetic acid increased during the latent period.
- Association Latent period of IAA response decreased threefold during the first three hours after excision.
- Observation Sensitivity to low IAA levels similarly increased after a previous hormone exposure ended.
- Observation Increased responsiveness to low IAA did not coincide with increased hormone uptake.
- Observation The IAA dose-response relation changed with time.
- Mechanism Authors interpret the time-dependent response as sensory adaptation to auxin.
- Mechanism Indirect evidence suggests an auxin-dependent inhibitor may influence sensory adaptation.