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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
Vol. 43, No. 4 (Apr., 1968), pp. 641-644
Published by: American Society of Plant Biologists (ASPB)
Stable URL: http://www.jstor.org/stable/4261348
Page Count: 4
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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.
Plant Physiology © 1968 American Society of Plant Biologists (ASPB)