Metabolism of 2,4-dichlorophenoxyacetic acid in cell suspension cultures of soybean (Glycine max L.) and wheat (Triticum aestivum L.) : II. Evidence for incorporation into lignin

Scheel, D.; Sandermann, H.

Planta 152(3): 253-258


ISSN/ISBN: 0032-0935
PMID: 24302424
DOI: 10.2307/23375265
Accession: 000927803

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Cell suspension cultures of soyabean and wheat incorporated 2,4-D into a metabolite fraction which was insoluble in ethanol, water, and hot sodium dodecylsulphate. Further treatment with hot dimethylformamide solubilized a material which appeared to consist of 2,4-D derivatives covalently bound to lignin. 2,4-D appeared to be incorporated as the intact molecule, as shown by comparison of ring- and sidechain-labelled 2,4-d and by detection of monohydroxylated and intact 2,4-D as the major radioactive products of acid hydrolysis. The same compounds were released from the metabolite material which could not be solubilized in dimethylformamide. The incorporation of xenobiotics or their metabolites into lignin, followed by deposition in the cell wall, is suggested as a general pathway for 'local excretion' and detoxification by plant cells.