Isolation of a triazophos-degrading strain Klebsiella sp E6 effectively utilizing triazophos as sole nitrogen source

摘要

A triazophos-degrading strain, Klebsiella sp. E6, was isolated by enrichment technology from soil that had been exposed longterm to triazophos. The strain grew well at pH 7.0-8.0 with a broad temperature profile ranging from 32 to 37 degrees C. It could keep good growth on methanol as carbon source and TAP as additional carbon source or nitrogen source. The experiment on the degradation activities of strain E6 showed that it utilized TAP more effectively when TAP was supplied as the sole nitrogen source, as opposed to additional carbon source. The intermediates of triazophos metabolism indicated that degradation occurred through a hydrolysis mechanism, one of the products of which, 1-phenyl-3-hydroxy-1,2,4-triazole, was also mineralized by strain E6. (c) 2005 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.