Degradation ofO,O-Dimethyl Phosphorodithioate byThiobacillus thioparusTK-1 andPseudomonasAK-2

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Abstract
O,O-Dimethyl phosphorodithioate (DMDTP) is an initial breakdown product of organophosphorus pesticides in fields. DMDTP is also released to natural environments by pesticide manufacturers. DMDTP-degrading microorganisms were not known. We isolated two bacteria from activated sludge. One of them, strain TK-1 identified as Thiobacillus thioparus, utilized DMDTP as a sole energy source and produced dimethyl phosphate (DMP) and sulfate. The other, strain AK-2 identified as Pseudomonas sp., utilized DMP as a sole energy and carbon source and degraded DMP to inorganic orthophosphate (Pi). DMDTP was degraded to Pi by the coaction of the two bacteria.