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ABSTRACT IN recent studies1–4 of the mechanism of action of plant growth-regulating compounds it has been postulated that active phenoxyacetic acids become attached at two points to a

specific substrate within the cell, the points of attachment being the carboxyl group and a position in the ring _ortho_ to the sidechain. So far, phenoxyacetic acids substituted in the 2-

and 6-ring positions have not been regarded as active in the _Avena_ straight-growth test. On the basis of other tests it has been put forward that high activity in chlorophenoxyacetic acids

is associated with the presence of two unsubstituted positions in the ring _para_ to each other. It has also been claimed that 2:6-dichlorophenoxyacetic acid and

2:4:6-trichlorophenoxyacetic acid are not themselves active but behave as anti-auxins. That is, when these compounds are mixed with either indolylacetic acid or 2:4-dichlorophenoxyacetic

acid the resulting stimulation in extension growth of _Avena_ coleoptiles is less than that induced by indolylacetic acid or 2:4-dichlorophenoxyacetic acid alone. Evidence of this type has

led to the proposal that 2:6-substituted compounds have only a single point of attachment to the substrate and act as anti-auxins by blocking one of the two-point attachments of other more

active compounds. From experiments carried out in this Department, however, it is now clear that the interpretation of the above results requires further consideration. Access through your

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BEING VIEWED BY OTHERS SLOW RELEASE OF A SYNTHETIC AUXIN INDUCES FORMATION OF ADVENTITIOUS ROOTS IN RECALCITRANT WOODY PLANTS Article 24 January 2024 DESIGN AND SYNTHESIS OF STRONG ROOT

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VARIOUS CROPS Article Open access 08 February 2024 REFERENCES * Hansch, C., Muir, R. M., and Metzenberg, jun., R. L., _Plant Physiol._, 26, 812 (1951). Article  CAS  Google Scholar  *

Leaper, J. M. F., and Bishop, J. R., _Bot. Gaz._, 112, 250 (1951). Article  CAS  Google Scholar  * McRae, D. H., and Bonner, J., _Plant Physiol._, 27, 834 (1952). Article  CAS  Google

Scholar  * McRae, D. H., and Bonner, J., _Physiol. Plant_, 6, 485 (1953). Article  CAS  Google Scholar  * Blackman, G. E., Osborne, D. J., and Novoa, S., _Proc. VIII Int. Bot. Congress_ (in

the press). Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Department of Agriculture and Agricultural Research Council Unit of Experimental Agronomy, Oxford DAPHNE J.

OSBORNE, G. E. BLACKMAN, R. G. POWELL, F. SUDZUKI & S. NOVOA Authors * DAPHNE J. OSBORNE View author publications You can also search for this author inPubMed Google Scholar * G. E.

BLACKMAN View author publications You can also search for this author inPubMed Google Scholar * R. G. POWELL View author publications You can also search for this author inPubMed Google

Scholar * F. SUDZUKI View author publications You can also search for this author inPubMed Google Scholar * S. NOVOA View author publications You can also search for this author inPubMed 

Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE OSBORNE, D., BLACKMAN, G., POWELL, R. _et al._ Growth-regulating Activity of Certain

2:6-Substituted Phenoxyacetic Acids. _Nature_ 174, 742 (1954). https://doi.org/10.1038/174742a0 Download citation * Issue Date: 16 October 1954 * DOI: https://doi.org/10.1038/174742a0 SHARE

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