Biodegradation of microcystin-RR and -LR by an indigenous bacterial strain MC-LTH11 isolated from Lake Taihu  

太湖土著菌MC-LTH11的筛选及其对藻毒素-RR和-LR的生物降解(英文)

作　　者：周远龙[1] 杨飞[1] 梁戈玉[1] 尹立红[1] 浦跃朴[1] 

机构地区：[1]东南大学环境医学工程教育部重点实验室,南京210009

出　　处：《Journal of Southeast University(English Edition)》2014年第1期68-71,共4页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.30972440);the National Science and Technology Major Project(No.2012ZX07101-005)

摘　　要：The indigenous bacterial strain MC-LTH11 with the capability of degrading microcystin-RR MC-RR and microcystin-LR MC-LR was successfully isolated from Lake Taihu.The bacterium was identified as Stenotrophomonas sp. which possessed a mlrA gene. The MC-LTH11 thoroughly degraded MC-RR and MC-LR with the initial concentration of 37.13 mg/L and 18.49 mg /L respectively in the medium containing crude microcystins extract within 6 d.The degradation rates were affected by temperature pH initial MCs concentration and the kinds of media. Additionally the bacterial strain MC-LTH11 also degraded thoroughly microcystins in the water body of Lake Taihu within 1 d.These results suggest that the Stenotrophomonas sp.MC-LTH11 has the capacity to bioremediate water bodies contaminated by microcystins and may contribute to the degradation of microcystins after the outbreak of harmful cyanobacterial blooms in Lake Taihu.从太湖中成功筛选出一株能够同时降解微囊藻毒素-RR(MC-RR)和微囊藻毒素-LR(MC-LR)的土著细菌MC-LTH11.经鉴定,该菌属寡养单胞菌属,并含有mlrA基因.在含有藻毒素粗提物的培养基中,MCLTH11能够在6 d内将初浓度分别为37.13 mg/L的MC-RR和18.49 mg/L的MC-LR完全降解,并且降解速度受到pH值、温度、初始微囊藻毒素浓度和培养基种类的影响.此外,MC-LTH11能够在1 d内完全降解太湖水样中的微囊藻毒素.研究结果表明,寡养单胞菌MC-LTH11具备对微囊藻毒素污染水体的修复能力,并可能是太湖水华爆发后微囊藻毒素降解的重要因素.

关 键 词：water treatment biodegradation microbiology microcystins high performance liquid chromatography HPLC 

分 类 号：X506[环境科学与工程—环境工程]