Abstract
IN the ‘two-point attachment’ theory1 on the mechanism of action for growth regulators of the auxin type we have assumed as a working hypothesis that the reaction between auxin and substrate is more chemical than physical in nature and that covalent-bond formation is a possibility. The need for an aromatic ring with at least one unsubstituted position for auxin activity2 confirms our original belief that an ortho position in the phenoxyacetic acids is most suitable stereoelectronically to serve as one of the two points which attach the molecule to the plant substrate. The carboxyl serves as the second point, permitting the auxin to form a ring when joined to a plant protein. This reaction mechanism is supported by the work of Bonner et al.3,4.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Muir, R. M., and Hansch, C., Ann. Rev. Plant Physiol., 6, 157 (1955).
Hansch, C., and Muir, R. M., Plant Growth Regulation, 431 (Iowa State University Press, Ames, 1961).
Foster, R. J., McRae, D. H., and Bonner, J., Proc. U.S. Nat. Acad. Sci., 38, 1014 (1952).
McRae, R. J., and Bonner, J., Plant Physiol., 27, 834 (1952).
Hansch, C., Muir, R. M., and Metzenberg, R. L., Plant Physiol., 26, 812 (1951).
Muir, R. M., and Hansch, C., Plant Growth Regulation, 249 (Iowa State University Press, Ames, 1961).
Fukui, K., Nagata, C., and Yonezawa, T., J. Amer. Chem. Soc., 80, 2267 (1958).
Lingane, J. J., Electroanalytical Chemistry, second ed., 607 (Inter-science Pub., Inc., New York, 1958).
Hayes, V. H., and Branch, G. E. K., J. Amer. Chem. Soc., 65, 1555 (1943).
Jaffe, H. H., Chem. Rev., 53, 191 (1953).
Åberg, B., The Chemistry and Mode of Action of Plant Growth Substances, 93 (Butterworths Pub., Ltd., London, 1956).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
HANSCH, C., MALONEY, P., FUJITA, T. et al. Correlation of Biological Activity of Phenoxyacetic Acids with Hammett Substituent Constants and Partition Coefficients. Nature 194, 178–180 (1962). https://doi.org/10.1038/194178b0
Issue Date:
DOI: https://doi.org/10.1038/194178b0
This article is cited by
-
Modeling the behavior of monoclonal antibodies on hydrophobic interaction chromatography resins
Bioresources and Bioprocessing (2024)
-
Integrating QSAR modelling and deep learning in drug discovery: the emergence of deep QSAR
Nature Reviews Drug Discovery (2024)
-
Efficiency of pharmaceutical toxicity prediction in computational toxicology
Toxicological Research (2024)
-
Clustering of atoms relative to vector space in the Z-matrix coordinate system and ‘graphical fingerprint’ analysis of 3D pharmacophore structure
Molecular Diversity (2024)
-
The potential of phenothiazinium dyes as cytotoxicity markers in cisplatin-treated cells
Scientific Reports (2023)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.