Fate of a Herbicide <sup>14</sup><i>C</i>-Alloxydim-sodium in Sugar Beet

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  • 除草剤アロキシジンのサトウダイコンにおける運命

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Abstract

A new herbicide, alloxydim-sodium(ADS) [sodium salt of 2-(1-allyloxyamino)-butylidene-5, 5-dimethyl-4-methoxycarbonylcyclohexane-1, 3-dione] was applied to the leaves of sugar beet (Beta vulgaris). The total recovery of the radioactivity of 14C-ADS, labeled at C-1 position of the butylidene group, gradually decreased with half-life of 11 days. The translocation of the radioactivity to other parts of the plant was little and the residues calculated as apparent ADS in roots were 0.16, 0.0096 and 0.0020ppm at 1.5, 4 and 6 months after the treatment, respectively. The main metabolite in the treated leaves was a deallyloxylated compound (CM-I) and minor ones were two oxo-tetrahydrobenzoxazole derivatives (CM-II, CM-III). The amounts of these metabolites reached the maximum around 10 days with 18.0% (CM-I), 2.6% (CM-II) and 2.5% (CM-III) of the applied radioactivity. This type of transformation of ADS also occurred under non-biological conditions, and the mechanism is discussed.

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