Characterization of an atrazine-degrading Pseudaminobacter sp. isolated from Canadian and French agricultural soils

Article Abstract:

Research has been conducted on the herbicide atrazine used in corn production. The isolation of bacterial strains that use this herbicide as a nitrogen source has been investigated.

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Characterization of S-triazine herbicide metabolism by a Nocardioides sp. isolated from agricultural soils

Article Abstract:

Researchers report a novel s-triazine hydrolase from Nocardioides sp. strains that degrades a large number of s-triazine herbicides. The enzyme converts chlorine or methylthio-substituted herbicides to their corresponding hydroxy derivatives.

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Biodegradation of the herbicide Bromoxynil (3,5-dibromo-4- hydroxybenzonitrile) by purified pentachlorophenol hydroxylase and whole cells of Flavobacterium sp. strain ATCC 39723 is accompanied by cyanogenesis

Article Abstract:

Microbial degradation of the herbicide bromoxynil produced bromide and cyanide. This happened when whole cells of Flavobacterium specie strain ATCC 39723 metabolized bromoxynil. The purified pentachlorophenol(PCP) hydroxylase from the same strain metabolized PCP by stoichiometric replacement of the hydroxyl group by chlorine atoms to produce tetrachlorohydroquinone. Theenzymatic dehalogenation of PCP and cyanogenesis in bromoxynil proceeded by using similar mechanism except that PCP hydroxylase specifically attacked the para position of halogenated phenols. Metabolism of bromoxynil by the Flavobacterium strain whole cells was accompanied by cyanogenesis but not when degraded by PCP hydroxylase. Use of the purified hydroxylase in the biodegradation of bromoxynil produced dibromohydroquinone instead of bromine and cyanide as with the use of whole cells. Dibromohydroquinone can be further metabolized to achieve complete bromoxynil mineralization.

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