The metabolism of the herbicide [uC]2-(2,4-dichlorophenoxy)-propionic acid (dichlorprop) was studied in excised seedlings of barley (Hordeum vulgare). It was rapidly taken up and metabolized by the plants yielding 5 metabolites. The metabolites, isolated by extraction with aqueous acetone, separated and purified by TLC, were identified by enzymatic, chemical, and spectrometric methods. Hydroxylation takes place at the 4-position of the aromatic ring, involving the NIH-shift of the chlorine to the 5-position and, to a minor extent, to the 3-position. The parent compound and also the 4-hydroxy derivatives undergo conjugation with mono-and diglu coses at the carboxyl and at the hydroxyl group, respectively. The time course of metabolism during 24, 48, and 72 h is presented, indicating interconversion reactions.
Akademie der Wissenschaften der DDR , Institut für Biochemie der Pflanzen, Weinberg 3, Halle/Saale. The metabolism of [1-14C]2-(2,4-dichlorophenoxy)-propionic acid was studied in excised plants and cell suspension cultures of tomato. It was rapidly taken up and metabolized by both the plants and the cultured cells. The metabolites, isolated by extraction with aqueous acetone, separated and purified by TLC and HPLC, were identified by chemical and spectrometric methods. Conjugates with carbohydrates were detected. Glucose, diglucose as the main conjugating moiety, and triglucose were found as carbohydrate components within the conjugates. Almost the same conjugates occurred in plants and cultured cells.
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