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Inhibitory Effects of Dichlorophenoxyacetones on Auxin-Induced Growth of Avena Coleoptile Sections

Robert E. Masingale, Janet E. Lewis, Sarah R. Bryant and Charles G. Skinner
Plant Physiology
Vol. 43, No. 4 (Apr., 1968), pp. 641-644
Stable URL: http://www.jstor.org/stable/4261348
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Inhibitory Effects of Dichlorophenoxyacetones on Auxin-Induced Growth of Avena Coleoptile Sections
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Abstract

Six dichlorophenoxyacetones were synthesized and examined as potential metabolic antagonists utilizing Avena coleoptile sections and the straight growth assay procedure. Supplements of indoleacetic acid promoted growth of the sections which were inhibited by the analogs; the most inhibitory derivatives were 2,3-; 2,4-; 2,5-; and 3,4-di-chlorophenoxyacetone which produced half-maximal growth responses (relative to the unaugmented control growth) at concentrations of 106, 86, 80, and 62 μg/ml, respectively. A Lineweaver-Burk plot of the data for the inhibition by 2,4-dichlorophenoxyacetone and its reversal by indoleacetic acid appeared to represent an uncompetitive-like inhibition.

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