Inhibition of Acetylcholinesterases from Aphelenchus avenae by Carbofuran and Fenamiphos
Abstract
Exposure to carbofuran and fenamiphos for 72 hours reduced the numbers of active Aphelenchus avenae in aqueous suspension by 75%. When nematicides were removed, many A. avenae exposed to carbofuran resumed normal movement but A. avenae treated with fenamiphos did not recover. Acetylcholinesterase (ACHE) activity was suppressed by 95% in nematodes treated with carbofuran or fenamiphos. However, 48 hours after treated nematodes had been placed in water, AChE activity in carbofuran treated populations was 98% of the levels in control nematodes. Nematodes that had been treated with fenamiphos showed only slight AChE recovery. The antidotes, atropine sulfate and 2-PAM, were largely ineffective in counteracting the toxic effects of the nematicides. Key words: acetylcholinesterase, antidote, Aphelenchus avenae, carbofuran, fenamiphos, nematicide.Downloads
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