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Changes in membrane permeability carbohydrate content lipid content and lipid composition in root tips from zea mays after treatment with diclofop methyl



Changes in membrane permeability carbohydrate content lipid content and lipid composition in root tips from zea mays after treatment with diclofop methyl



Zeitschrift fuer Pflanzenphysiologie 100(5): 415-426



The effect of the herbicide diclofop-methyl (methyl 2-[4-(2',4'-dichlorophenoxy)phenoxy]propanate) on physiological activities and on cell constituents of root tips isolated from untreated and herbicide treated seedlings of Z. mays was studied. Experiments were carried out with 3 concentrations of diclofop-methyl: 3 .times. 10-7 M, which was sublethal allowing root growth; 3 .times. 10-6 M, the minimum inhibition concentration; and 3 .times. 10-5 M. The herbicide had no effect on respiratory O2-uptake, protein and nucleic acid content. It caused an accumulation of alcohol soluble carbohydrates, and an increase in leakage of amino compounds from treated root tips. The herbicide induced a reduction of phospholipid and triglyceride content, and an increase in glycolipid content. The decrease of phospholipids was due mainly to phosphatidylethanolamine and phosphatidylcholine, and was probably the cause for the increase in membrane permeability. The accumulation of glycolipids was explained by an increase in the content of sterol glycosides and 2 other unknown glycolipids which contained no fatty acids. Diclofop-methyl caused a shift in percentual fatty acid distribution. Herbicide treated root tips showed, compared with the controls, a lower content of oleic and palmitic acid, and a higher content of linolenic acid. This shift in fatty acids was observed in the total lipid extract and in several individual polar lipids. Effects on membrane permeability and on lipid content and lipid composition increased with increasing herbicide concentrations, and increasing incubation times. They appeared early enough to be responsible for the inhibition of root growth, observed after treatment of maize seedlings with diclofop-methyl.

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