title: Biological Properties of d-Amino Acid Conjugates of 2,4-D.
abstract: 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-(14)C]2,4-D resulted in a greater uptake of [1-(14)C]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 [(14)C]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.
authors: Department of Entomology, Pesticide Research Laboratory and Graduate Study Center, The Pennsylvania State University, University Park, Pennsylvania 16802.
authors: G H
authors: GH
authors: Davidonis
authors: R H
authors: RH
authors: Hamilton
authors: R P
authors: RP
authors: Vallejo
authors: R
authors: R
authors: Buly
authors: R O
authors: RO
authors: Mumma