Inhibitory Effects of Dichlorophenoxyacetones on Auxin-induced Growth of Avena Coleoptile Sections | Zendy

Robert E. Masingale | Zendy; Janet E. Lewis | Zendy; Sarah R. Bryant | Zendy; Charles G. Skinner | Zendy

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

Author(s) -

Robert E. Masingale,

Janet E. Lewis,

Sarah R. Bryant,

Charles G. Skinner

Publication year - 1968

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.43.4.641

Subject(s) - coleoptile , avena , auxin , inhibitory postsynaptic potential , growth inhibition , chemistry , uncompetitive inhibitor , biochemistry , botany , biology , in vitro , non competitive inhibition , enzyme , endocrinology , gene

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-dichlorophenoxyacetone which produced half-maximal growth responses (relative to the unaug-mented control growth) at concentrations of 106, 86, 80, and 62 mug/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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