Auxin Activity of Ring-Alkylated Derivatives of Indole-3-Acetic Acid

Branka Salopek, Eduard Dolusic, Volker Magnus

Research output: Contribution in Book/Catalog/Report/Conference proceedingConference contribution


The growth-promoting activities of ring-alkylated (alkyl = 2-, 4-, 5-, 6-, or 7-methyl ; 4- or 5-ethyl ; 5-propyl or 5-butyl) derivatives of indole-3-acetic acid (IAA) in the Avena coleoptile straight-growth assay were determined and correlated with structural parameters. Auxin activity was expressed as the net elongation of coleoptile sections (in per cent of the response in control experiments with non-substituted IAA) at the optimal concentrations (about 4 -mol/l) of the compounds examined. The elongations observed were dependent on the structures of the substituents and on their position at the indole nucleus. A methyl group in any but the 2-position increased biological activity up to 150% (5-methyl IAA). The elongation response decreased notably as the length of the alkyl chain increased. Thus, for example, 5-ethyl, 5-propyl, and 5-butyl IAA had 74%, 55%, and 46% of the growth-promoting activity of unsubstituted IAA.
Original languageEnglish
Title of host publicationProceedings of abstracts of the papers of the Sixth Congress of Croatian Biologists, Opatija, Croatia, 22-26 September 1997
Number of pages1
Publication statusPublished - 1997
Event6th Congress of Croatian Biologists, Opatija, Croatia - Opatija, Croatia
Duration: 22 Sep 1997 → …


Conference6th Congress of Croatian Biologists, Opatija, Croatia
CityOpatija, Croatia
Period22/09/97 → …


  • IAA
  • ring-alkylated IAA
  • indole-3-acetic acid
  • auxin activity


Dive into the research topics of 'Auxin Activity of Ring-Alkylated Derivatives of Indole-3-Acetic Acid'. Together they form a unique fingerprint.

Cite this