Abstract
The commercial fungicidal product Falimorph is suited to control Erysiphe graminis DC. in grain. The active ingredient aldimorph mainly consists of 4-n-dodecyl 2,6-dimethyl morpholine, besides small parts of homologous alkyl compounds. Both, side chain labeled 1'- 14 C-aldimorph and 4-n-dodecyl 2,6-dimethyl [ 14 C]-morpholine[3,5 -14 C] were used to elicitate metabolism in seedlings of Hordeum distichon . Not later than 8 d after leaf application an average of 90% of resorbed radioactivity was found to be present in the form of metabolites. Cochromatographical studies with authentic substances and experiments involving hydrolysis and derivatisation of metabolites led to the elucidation of a metabolic pathway as follows: in a first step aldimorph is hydroxylated at the terminal methyl group of the dodecyl side chain, followed by the transformation of the hydroxyl compound to a glycoside conjugate. Besides, 4-carb-oxymethyl 2,6-dimethylmorpholine is formed by β -oxidation of the aliphatic side chain.
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