Degradability of atrazine, cyanazine, and dicamba in methanogenic enrichment culture microcosms using sediment from the Pearl River of Southern China

TY - JOUR

T1 - Degradability of atrazine, cyanazine, and dicamba in methanogenic enrichment culture microcosms using sediment from the Pearl River of Southern China

AU - Lin, Chen

AU - Gu, Ji Guang

AU - Qiao, Chuanling

AU - Duan, Shunshan

AU - Gu, Ji Dong

N1 - Funding Information: Acknowledgements We thank the technical assistance of Electron Microscopy Unit, Queen Mary Hospital, The University of Hong Kong. We would also like to thank the reviewer’s comments in improving the manuscript significantly from an early version. This research was supported by “863 Project” no. 2002AA601160 and SCSIO project no. LYQY200306.

PY - 2006/6

Y1 - 2006/6

N2 - Degradation of three herbicides, atrazine, cyanazine and dicamba, was assessed in laboratory microcosms incubated under simulated methanogenic conditions using sediment from Pearl River of Southern China as an inoculum. Atrazine was much more resistant to degradation than cyanazine and dicamba over 300 days of incubation. Biodegradation of cyanazine and dicamba was further substantiated by establishment of enrichment transfer cultures in which the degradation of the respective herbicide was accelerated by the active microorganisms. Degradation of cyanazine initially involved the removal of chlorine and the two side chains, while that of dicamba was O-demethylation reaction forming 3,6-dichlorosalicyclic acid. Results suggest that biodegradation of xenobiotics can be established through enrichment culture transfer technique, and further mechanism of degradation and microorganisms involved can be elucidated.

AB - Degradation of three herbicides, atrazine, cyanazine and dicamba, was assessed in laboratory microcosms incubated under simulated methanogenic conditions using sediment from Pearl River of Southern China as an inoculum. Atrazine was much more resistant to degradation than cyanazine and dicamba over 300 days of incubation. Biodegradation of cyanazine and dicamba was further substantiated by establishment of enrichment transfer cultures in which the degradation of the respective herbicide was accelerated by the active microorganisms. Degradation of cyanazine initially involved the removal of chlorine and the two side chains, while that of dicamba was O-demethylation reaction forming 3,6-dichlorosalicyclic acid. Results suggest that biodegradation of xenobiotics can be established through enrichment culture transfer technique, and further mechanism of degradation and microorganisms involved can be elucidated.

KW - Atrazine

KW - Cyanazine

KW - Degradation

KW - Dicamba

KW - Enrichment

KW - Herbicide

KW - Methanogenic conditions

UR - http://www.scopus.com/inward/record.url?scp=33745835424&partnerID=8YFLogxK

U2 - 10.1007/s00374-006-0082-9

DO - 10.1007/s00374-006-0082-9

M3 - 文章

AN - SCOPUS:33745835424

SN - 0178-2762

VL - 42

SP - 395

EP - 401

JO - Biology and Fertility of Soils

JF - Biology and Fertility of Soils

IS - 5

ER -