Abstract
Hansch and Muir1 have shown that a free ortho position is required for growth regulatory activity in the phenoxyacetic acid series (Avena straight-growth test), and have suggested that the active compound reacts “with a substrate at two points, first by means of the carboxyl group, and second at a position ortho to the attachment of the carboxyl group”. This explanation does not account for Wain's finding2 that one hydrogen on the α-carbon atom was essential for activity (Went pea test).
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References
Plant Physiol., 24, 358 (1949).
J. Sci. Food Agric., 2, (3), 101 (1951).
Baker, L., “Tautomerism”, 107 and 154.
Biochem. J., 36, 737 (1942).
“Plant Biochemistry”, 458 (1950).
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RHODES, A., ASHWORTH, R. Mode of Action of Growth Regulators in Plants. Nature 169, 76–77 (1952). https://doi.org/10.1038/169076a0
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DOI: https://doi.org/10.1038/169076a0
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