Claim · model-written summary
Following auxin withdrawal, response magnitude to suboptimal auxin doubled.
Zea mays subsp. maysVerbatim
e0“During the 3 hr period following withdrawal of exogenous auxin there is a two-fold increase in magnitude and a three-fold decrease in latent period of a growth response to a sub-optimal level of auxin.”
e1“corn (Zea mays L., Bear Hybrid WF 9×38) coleoptiles”
Title
Further characterization of the spontaneous growth response in Zea coleoptile segments
Michael L. Evans; Maria Simon; Mary Jo Vesper Plant and Cell Physiology 1977. doi:10.1093/oxfordjournals.pcp.a075452
Other claims from this paper (7)
- Observation Excised corn coleoptile segments increased growth rate about four hours after excision.
- Intervention effect Brief IAA exposure delayed the spontaneous response about two hours.
- Intervention effect Auxin exposure suppressed an established spontaneous growth response until about 2.5 hours after withdrawal.
- Observation Following auxin withdrawal, the response latent period fell threefold.
- Mechanism The authors suggest that changing auxin sensitivity or endogenous auxin explains spontaneous growth.
- Observation Apical Zea coleoptile sections with tips intact grew poorly and showed weak spontaneous and exogenous auxin responses.
- Mechanism The authors infer that the tip produces a growth inhibitor.