Biodegradation of herbicide atrazine by bacteria isolated from agricultural soils
Keywords:
Atrazine, Stenotrophomonas, biodegradation, hormonal disruptor.Abstract
Atrazine is one of the most widely used herbicides worldwide in corn, sorghum, sugarcane, pineapple and others, belongs to the family of s-triazine to present a heterocyclic ring that confers high stability. It is considered by the EPA, WHO, OSPAR, WWF as hormonal disruptor and its environmental persistence, ability to seep into the soil, is a contaminant of groundwater reservoirs, rivers and lakes. The present work is evaluated efficiency of atrazine degradation by bacteria isolated from agricultural soils. 7 microbial consortia MIG-AI, MIG-AS-BS MIG MIG-DI, MIGE,-F and MIG MIG-G selected by growth and progressive solubility of the herbicide over 4 subcultures in minimal medium as a sole atrazine carbon and nitrogen source. The MIG-AI consortium selected for best performance presents a specific growth rate of 0.31 h-1 atrazine solubilizing in 2 days and generating areas of clearance in 4 days in liquid and solid medium, respectively. It was identified by analysis of 16S rRNA gene of strain Stenotrophomonas maltophilia MIG-AI/2 having ability to degrade atrazine.Downloads
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Copyright (c) 2016 Miguel Cervantes, Pablo Ramírez
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