Plant Physiol.
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Plant Physiology 42:1519-1526 (1967)
© 1967 American Society of Plant Biologists

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Structure-Activity Relationship in the Auxin Activity of Mono-Substituted Phenylacetic Acids 1

Robert M. Muir, Toshio Fujita2 and Corwin Hansch

Department of Botany, University of Iowa, Iowa City, Iowa 52240, Department of Chemistry, Pomona College, Claremont, California

The analysis of substituent constants for the lipophilic and electronic factors in the auxin activity of substituted phenylacetic acids in elongation of coleoptile segments shows that these factors parallel those for the phenoxyacetic acids but assign reactivity in growth promotion to the meta position of phenylacetic acid. The inhibitory effects with supra-optimal concentrations are highly dependent on the lipophilic character of the molecules.

2 Permanent address: Department of Agricultural Chemistry, Kyoto University, Kyoto, Japan.

1 Supported in part by Research Grant GM 07492 from the National Institutes of Health.




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 Appl. Environ. Microbiol.Home page
E. Somers, D. Ptacek, P. Gysegom, M. Srinivasan, and J. Vanderleyden
Azospirillum brasilense Produces the Auxin-Like Phenylacetic Acid by Using the Key Enzyme for Indole-3-Acetic Acid Biosynthesis
Appl. Envir. Microbiol., April 1, 2005; 71(4): 1803 - 1810.
[Abstract] [Full Text] [PDF]


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Copyright © 1967 by the American Society of Plant Biologists