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溴氰菊酯降解菌的筛选及降解特性研究
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摘要
生物修复对降解污染基质中的农药是一种有效的环境污染修复方法。从自然界中筛选出能够降解特定污染物的高效菌种,有针对性地投加到受污染环境中的生物强化技术,能够快速提供具有降解作用的微生物,在环境的农药污染治理中显示出巨大的潜力。溴氰菊酯是拟除虫菊酯类农药,这类农药为神经类毒物,属高毒性物质,其应用非常广泛,是杀虫剂中的第三大类。该类农药残留已成为目前农产品的主要农药残留类型之一,在污染环境的同时严重危害人类的健康。微生物在农药残留降解过程中起着重要的作用,微生物降解技术已成为去除农药残留的绿色生产技术。因此,积极开展溴氰菊酯降解菌的筛选工作有着重要意义。
     本论文目标是寻找能够降解溴氰菊酯农药的高效降解菌。从长期使用溴氰菊酯的菜园土壤和过期的农药中筛选出能够以溴氰菊酯为唯一碳源生长的降解菌株,并研究其降解效率、降解特性及其农药降解谱。此外,通过室内盆栽试验研究其最优化降解条件。
     最终分离得到两株溴氰菊酯降解菌(编号为X09、X24)。经Biolog自动微生物分析系统鉴定结果为:菌株X09为阴沟肠杆菌Enterobacter cloacae,菌株X20为荧光假单胞菌Pseudomonas fluorescens。两种降解菌在溴氰菊酯为唯一碳源的选择性培养基中生长良好,在pH7.0、添加50mg/L溴氰菊酯为唯一碳源的基础培养基中,30℃振荡培养,接种7天后,对溴氰菊酯的降解率分别达62.82%、43.25%。菌株X09、X20对溴氰菊酯的最大耐受浓度为800mg/L。
     降解菌株的最优化降解条件为温度30℃、pH7.0、接种量25%和培养时间96h。其中菌株X09在该条件下降解率高达65%以上;菌株X20在外加少量碳源如淀粉、葡萄糖、牛肉膏等,可以显著提高其降解能力,达到69.3%。此外,两种降解菌对其他拟除虫菊酯类农药也有一定的降解能力,对氯氰菊酯、甲氰菊酯、氰戊菊酯的平均降解率分别为53.0%,49.9.%,56.7%。
     室内盆栽正交试验统计结果表明,各种因素对菌株降解能力影响大小依次为菌株种类、处理时间、喷菌量、处理方式及施药量。统计分析结果为,最优化降解条件为菌株X24,施药量为10mg/L,喷菌量为5mL/株,处理方式为菌液与农药混和喷施以及处理时间为7天。另外,菌液和农药混和喷施的处理方法取得了较好的降解效果,为溴氰菊酯降解菌剂的研究及微生物修复农药残留问题提供了一定的数据参考。
Bioremediation is an environmentally-benign method for degrading insecticides from contaminated substrates.Bacteria that can effectively degrade pesticide compound had been isolated from natural environment,they can be pour into contaminated system and obviously enhanced the effect,therefore,they have extraordinary potential in bioremediation.Pyrethroids are neural toxicum substance and is very harmful to human health.Its origin existed wildly in our life.Synthetic Pyrethroid insecticides is the third largest class of insecticides.The residue of this kind of insecticides has become one of the most dominant insecticide residues in farm produce.And microorganism has important function on degrading pesticide residues.Therefore, the technology of microbial degradation has turned into the organic production technology to remove pesticide residues.
     In this text,our goal was to find bacteria that could degrade the Pyrethroids that are used in agriculture production.We isolated bacteria from pesticide-treated contaminated soil from vegetable garden.Initial screening was on enrichment media,which subsequent sequential isolation on minimal media containing the pesticides as sole C source.
     As a result,two strains which grew particularly well(designated X09 and X20) was Enterobacter cloacae and Pseudomonas fluorescens respectively,identified with the Biolog whole-auto-microbial analysis system.We then used gas chromatography HP6890 to measure the rates of disappearance of the deltamethrin from pH 7.0,liquid cultures maintained aerobically at 30℃.Other than 50mg/L of the pesticides,the media were carbon flee.Seven days after inoculation with X09 and X20the concentrations of the deltamethrin decreased was 62.82%and 43.25%respectively.
     The optimal conditions for the aerobic degradation of deltamethrin by two strains should be Nutrition Agar substrate with the content of 50mg/L Deltamathrin,at 30℃,with pH 7.0 and 96 hours and inoculation 25%.Growth measured as optical density measured the rate of disappearance of other pesticides,we showed that two strains also degrade the Cypermethrin, Fenpropathrin and Fenvalerate,53.9%,49.9%and56.7%being average degraded respectively, after 7 days.Preliminary observation of the stains,they were all grew negative reaction,we further indentify the physiological and biochemical of the strains.Since X09 Enterobacter cloacae and X20 Pseudomonas fluorescens can degrade a broad spectrum pesticides,it should be able to use it in a bioremediation process to minimize contamination of the product and the environment during primary products cultivation.
     From the pot-culture orthogonal experiment statistical analysis result,we can see the optimal conditions for the degradation of deltamethrin were that,strain-X20,each plant was sprayed 10mg/L Deltamethrin,5mL culture liquid,spraying bacteria culture liquid mixed with deltamethrin and kept for 7 days.In this paper,through nearly two years of laboratory work,we isolated Deltamethrin-degrading bacteria.Study on its degrading characteristics,then we simulated environmental conditions,explore they degradation effect.We work for microbial remediation of pesticide residues,then provide data basis.
引文
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