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STUDIES ON PLANT GROWTH‐REGULATING SUBSTANCES XI. AUXIN ANTAGONISM IN RELATION TO A THEORY ON MODE OF ACTION OF ARYL‐ AND ARYLOXY‐ALKANECARBOXYLIC ACIDS
Author(s) -
WAIN R. L.,
WIGHTMAN F.
Publication year - 1957
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1957.tb00450.x
Subject(s) - antagonism , auxin , biology , mode of action , stereochemistry , function (biology) , plant growth , curvature , amino acid , biochemistry , botany , microbiology and biotechnology , chemistry , receptor , mathematics , gene , geometry
A study has been made of the antagonistic effects of a range of phenoxy and other acids on the growth‐promoting activity of a number of auxins as assessed by the Avena cylinder and pea curvature tests. The compounds examined as inhibitors were selected on a logical basis, these molecules not possessing the structural requirements considered necessary for growth‐regulating activity, yet possessing groupings which might allow them to accumulate at a site of action from which the growth response by auxins might be initiated. Our previous demonstrations that inactive stereoisomers of x‐aryloxy propionic acids can competitively inhibit the activity of their active enantiomorph has been confirmed and a similar antagonism has been found to operate with other inactive aryloxy acids. Such competitive antagonism is discussed in relation to a ‘three‐point’ contact theory on mode of action.