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Intoxication of Aphelenchus Avenae By Ethylene Dibromide

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For more content, see Nematology.

The exposure of Aphelenchus avenae to low concentrations of ethylene dibromide results in a very small conversion of the halide by the nematodes just preceding death. Using ethylene dibromide 1, 2-C14, two primary products are characterized. These are ethylene ( ~5 % ) and O-acetylserine (~95%). These products account for all of the ethylene dibromide converted. The radiolabel in O-acetylserine resides in the carbons of the acetyl moiety. These transformations are taken to indicate two primary modes of intoxication of the nematodes. These are formulated as: (1) a direct reaction of the halide with an iron center in the respiratory sequence and (2) the substitution of a serine at the active site of an esterase or protease.

Affiliations: 1: Department of Nematology, University of California, Riverside, Calif. 92521, U.S.A.


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