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Biological Properties of D-Amino Acid Conjugates of 2,4-D ¹

Department of Entomology, Pesticide Research Laboratory and Graduate Study Center, The Pennsylvania State University, University Park, Pennsylvania 16802, Department of Biology, Pesticide Research Laboratory and Graduate Study Center, The Pennsylvania State University, University Park, Pennsylvania 16802

Some D-amino acid (glutamic acid, valine, or leucine) conjugates of 2,4-dichlorophenoxyacetic acid (2,4-D) at 10^–5 molar, stimulated elongation of Avena sativa L. var Mariner coleoptile sections and growth of soybean (Glycine max. L. var Amsoy) tissue as much as did the L-amino acid conjugates at 10^–6 molar. The D-methionine conjugate did not stimulate growth of soybean root callus tissue but did stimulate Avena elongation. The D-aspartic acid conjugate did not stimulate elongation of Avena coleoptiles but did stimulate growth of root callus tissue.

Pretreatment of root callus tissue with 100 micromolar 2,4-D-(D) -or (L) glutamic acid for 18 hours prior to incubation for 6 hours in [1-¹⁴C]2,4-D resulted in a greater uptake of [1-¹⁴C]2,4-D than did pretreatment with 2,4-D. Qualitatively the metabolites were similar in all preincubation treatments. Preincubation with 2,4-D-(D)-glutamic acid also resulted in larger free [¹⁴C]2,4-D pool and a significant increase in water-soluble conjugates when compared with 2,4-D, or 2,4-D-(L)-glutamic acid preincubations.