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Abstract
In general, the auxin activity of indole-3-acetic acid decreases gradually when alkyl substituents of increasing chain length are attached to its ring-carbons. Only for the 2-position, Kögl and Kostermans (Hoppe Seyler's Z. physiol. Chem. 235, 201, 1935) claimed that any substituent larger than a methyl group rendered the molecule inactive. We showed, however, that the '2-ethylindole-3-acetic acid' they used in their experiments is, in reality, 3-methylindole-2-propionic acid. The proper 2-ethylindole-3-acetic acid and its 2-propyl homologue were prepared by a different route and characterized by NMR spectroscopy and X-ray crystallography. Both compounds showed auxin activity in the Avena coleoptile-section straight-growth test, with dose-response curves similar to those of 2-methylindole-3-acetic acid, i. e. not quite as high as for co-assayed indole-3-acetic acid and shifted by about one order of magnitude towards higher concentrations.
| Translated title of the contribution | Molecular structure and auxin activity of 2-alkyl-indole-3-acetic acids |
|---|---|
| Original language | Other |
| Pages | Zbornik sazetaka priopcenja Sedmog hrvatskog bioloskog kongresa, Hvar, Hrvatska, 24.09-29.09.2000, pp. 91-91 |
| Publication status | Published - 2000 |
| Event | Sedmi hrvatski bioloski kongres - Hvar, Croatia Duration: 24 Sept 2000 → 29 Sept 2000 |
Conference
| Conference | Sedmi hrvatski bioloski kongres |
|---|---|
| Country/Territory | Croatia |
| City | Hvar |
| Period | 24/09/00 → 29/09/00 |
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Auxin activity and molecular structure of 2-alkylindole-3-acetic acids
Antolic, S., Dolusic, E., Kozic, E. K., Kojic-Prodic, B., Magnus, V., Ramek, M. & Tomic, S., 2003, In: Plant Growth Regulation. 39, 3, p. 235-252 18 p.Research output: Contribution to journal › Article › peer-review
Open AccessFile53 Downloads (Pure) -
Molecular recognition of auxins - a rational approach to plant growth regulation
Antolic, S., Dolusic, E., Bertosa, B., Kojic-Prodic, B., Magnus, V., Salopek-Sondi, B. & Tomic, S., 2002, Book of Abstracts, First Croatian Congress on Molecular Life Sciences, Opatija, Croatia, 09-13.06.2002. p. 84-84 1 p.Research output: Contribution in Book/Catalog/Report/Conference proceeding › Conference contribution
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Molecular recognition of the plant hormone auxin is still a puzzle
Kojic-Prodic, B., Magnus, V., Tomic, S., Antolic, S., Salopek-Sondi, B., Dolusic, E. & Bertosa, B., 2002, Abstracts, XIX Congress and General Assembly of the International Union of Crystallography, Geneva, Switzerland, 06.-15.08.2002. Vol. A58. p. C139-C139 1 p. (Acta Crystallographica; vol. A58).Research output: Contribution in Book/Catalog/Report/Conference proceeding › Conference contribution
Activities
- 2 Participation in conference
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Sedmi hrvatski bioloski kongres
Eduard Dolusic (Contributor)
24 Sept 2000 → 29 Sept 2000Activity: Participating in or organising an event types › Participation in conference
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6th Congress of Croatian Biologists, Opatija, Croatia
Eduard Dolusic (Poster)
22 Sept 1997 → 26 Sept 1997Activity: Participating in or organising an event types › Participation in conference