Claim · model-written summary
Cytokinins have little effect on the spontaneous growth response.
Zea maysNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e6“Cytokinins have little effect on the spontaneous growth response, whereas gibberellic acid is observed to extend the latent period and reduce the magnitude of the response”
Title
The Nature of Spontaneous Changes in Growth Rate in Isolated Coleoptile Segments
Michael L. Evans; Mark R. Schmitt PLANT PHYSIOLOGY 1975. doi:10.1104/pp.55.4.757
Other claims from this paper (10)
- Observation Excised corn coleoptile segments show a strong increase in growth rate about 4 hours after cutting.
- Intervention effect The spontaneous increase in growth rate of coleoptile segments is prevented by 1 mmp-fluorophenylalanine.
- Intervention effect The spontaneous increase in growth rate of coleoptile segments is strongly inhibited by 0.1 mmp-chlorophenoxyisobutyric acid.
- Observation The increased growth rate is accompanied by a 95% increase in the ability of tissue extracts to convert (14)C-tryptophan to (14)C-indole-3-acetic acid.
- Observation Indole-3-acetic acid oxidase activity is nearly 3-fold higher in the growing segments.
- Observation The increase in growth rate is also observed in segments from coleoptiles grown aseptically.
- Intervention effect The spontaneous increase in growth rate is completely but reversibly inhibited by 1 mum indole-3-acetic acid.
- Intervention effect Gibberellic acid extends the latent period of the spontaneous growth response.
- Intervention effect Gibberellic acid reduces the magnitude of the spontaneous growth response.
- Mechanism The increase in endogenous growth rate may result from increased auxin production after derepression of the auxin biosynthesis pathway when the tissue is isolated from the auxin supply of the tip.