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首页> 外文期刊>International Biodeterioration & Biodegradation >Bacterial consortia from raw water and sludges from water potabilization plants are able to degrade atrazine
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Bacterial consortia from raw water and sludges from water potabilization plants are able to degrade atrazine

机译：来自原水的细菌联合体和自来水厂的污泥能够降解阿特拉津

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摘要

Atrazine is one of the most persistent herbicides that contaminate watercourses. However, its biodegradation has been scarcely studied in aquatic ecosystems. The present work studies the potential of bacteria collected from freshwater and sludges of three water potabilization plants to degrade atrazine. Bacteria from all samples, rarely exposed to the herbicide, were able to degrade atrazine as the sole N source in microcosms assays. Five bacterial consortia that degraded consistently 1 or 25 mg L-1 of atrazine within 48 h were established. T-RFLP analysis showed that three ribotypes accounting for more than 50% of the bacterial communities were common to the five consortia and the complete set of atrazine-degrading genes trzN, atzB, atzC and trzD was detected on them. Two consortia from the same origin but incubated with different atrazine concentrations (SAC 1 and SAC 25) contain isolates affiliated to Sinorhizobium sp. and Pseudomonas citronellolis, but Arthrobacter uraefaciens and Achromobacter xylosoxidans were specific of SAC 1 and SAC 25, respectively. These two consortia degraded atrazine in the presence of nitrate and grew in cyanuric acid. This paper describes the great potential for atrazine degradation by bacteria present in aquatic environments which can be exploited to design bioremediation processes
机译：阿特拉津是污染水道的最持久的除草剂之一。然而，在水生生态系统中很少对其生物降解进行研究。目前的工作研究了从三个自来水厂的淡水和污泥中收集的细菌降解阿特拉津的潜力。所有样品中的细菌很少接触除草剂，它们能够在微观分析中降解阿特拉津作为唯一的氮源。建立了在48小时内始终降解1或25 mg L-1的r去津的五个细菌群落。 T-RFLP分析显示，五个菌群共有三种细菌型，占细菌群落的50％以上，并在它们上检测到了完整的阿特拉津降解基因trzN，atzB，atzC和trzD的完整集合。来自相同来源但与不同at去津浓度（SAC 1和SAC 25）孵育的两个财团包含与中华根瘤菌属相关的分离株。和柠檬假单胞菌，但尿节杆菌和木氧化无色杆菌分别对SAC 1和SAC 25具有特异性。这两个财团在硝酸盐的存在下降解了阿特拉津，并在氰尿酸中生长。本文描述了水环境中存在的细菌降解阿特拉津的巨大潜力，可将其用于设计生物修复工艺

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