Abstract
Several indoleacetic acids, substituted in the benzene ring, were compared in the Avena straight growth bioassay. 4-Chloroindoleacetic acid, a naturally occurring plant hormone, is one of the strongest hormones in this bioassay. With an optimum at 10-6 mol l-1, it is more active than indoleacetic acid, 2,4-dichlorphenoxyacetic acid and naphthaleneacetic acid. 5-Chloro- and 6-chloroindoleacetic acids are very strong auxins as well. Other derivatives tested have a lower activity. 5,7-Dichloro- and 5-hydroxyindoleacetic acids have very low auxin activity at 10-4 mol l-1 and may be anti-auxins. Some of the derivatives were compared for their effect on pH decline in stem protoplast suspensions of Helianthus annuus L. and Pisum sativum L. The change of pH occurs without a lag period or with only a very short one. Derivatives which are very active in the Avena straight growth assay cause a larger pH decline than indoleacetic acid, while inactive derivatives cause effectively no pH decline.
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Abbreviations
- IAA:
-
Indoleacetic acid
- 4-Cl-IAA:
-
4-chloroindoleacetic acid
- 5,7-Cl2-IAA etc:
-
5,7-dichloroindoleacetic acid
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Böttger, M., Engvild, K.C. & Soll, H. Growth of Avena coleoptiles and pH drop of protoplast suspensions induced by chlorinated indoleacetic acids. Planta 140, 89–92 (1978). https://doi.org/10.1007/BF00389385
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DOI: https://doi.org/10.1007/BF00389385