title: Isolation and characterization of a denitrifying monocrotophos-degrading Paracoccus sp. M-1.
abstract: A bacterium strain, which is capable of degrading monocrotophos, was isolated from sludge collected from the bottom of a wastewater treatment system of a chemical factory, and named M-1. On the basis of the results of the cellular morphology, physiological and chemotaxonomic characteristics and phylogenetic similarity of 16S rDNA gene sequences, the strain was identified as a Paracoccus sp. The ability of the strain to mineralize monocrotophos was investigated under different culture conditions. Other organophosphorus insecticides and amide herbicides were also degraded by M-1. The key enzyme (s) involved in the initial biodegradation of monocrotophos in M-1 was shown to be a constitutively expressed cytosolic protein. The addition of M-1 (10(6) CFU g(-1)) to fluvo-aquic soil and a high-sand soil containing monocrotophos (50 mg kg(-1)) resulted in a higher degradation rate than that obtained from noninoculated soil. This microbial culture has great potential utility for the bioremediation of wastewater or soil contaminated with organophosphorus pesticides and amide herbicides.
authors.affiliation: Key Laboratory of Microbiological Engineering of Agricultural Environment, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China.
authors.forename: Kai-zhi
authors.initials: KZ
authors.lastname: Jia
authors.forename: Zhong-li
authors.initials: ZL
authors.lastname: Cui
authors.forename: Jian
authors.initials: J
authors.lastname: He
authors.forename: Peng
authors.initials: P
authors.lastname: Guo
authors.forename: Shun-peng
authors.initials: SP
authors.lastname: Li
mesh_terms: D001673:Biodegradation, Environmental; D008999:Monocrotophos / Q000378:metabolism*; D010230:Paracoccus / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification* / Q000378:metabolism*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology; D014874:Water Pollutants, Chemical
chemical_list: D012336:RNA, Ribosomal, 16S; D014874:Water Pollutants, Chemical; D008999:Monocrotophos