降解石油丝状真菌的筛选及其降解特性

Selection of Crude Oil-degrading Filamentous Fungi and Their Degradation Properties

  • 摘要: 从大庆石油污染土壤中分离得到14株石油降解丝状真菌,用以筛选可高效降解石油的菌群. 经过ITS(转录间隔区序列)分析,其中9株属于镰孢霉属(Fusarium sp.),2株属于黄白生丛赤壳菌属(Bionectria sp.),另外3株分别属于葡萄穗酶菌属(Stachybotrys sp.)、曲霉属(Aspergillus sp.)和雅致放射毛霉属(Actinomucor sp.);在固体培养基中各菌株的生长速率差异显著(P<0.01). 不同菌株能够特异降解不同的石油组分. 将筛选的优势菌株组成2个菌群,菌群1由菌株3、D2、D3和D52组成,菌群2由菌株3、6、D2和D3组成,分别考察单菌和2个菌群对原油的降解效果,结果表明:菌株原油降解试验30d后,单菌菌株D52对原油去除率最大,为64.25%;菌群1和菌群2对原油的去除率较高,分别达到74.55%和72.64%,可以考虑用于污油生物修复治理的工程菌群开发研究.

     

    Abstract: To select the microbial colony with the high oil-degrading ability, fourteen filamentous fungi strains were isolated from the crude-oil contaminated soil. By using ITS (Internal Transcription Sequence) analysis, nine strains were identified as Fusarium sp., two strains were as Bionectria sp., and the others were identified as Stachybotrys sp., Aspergillus sp., and Actinomucor sp., respectively. The mycelial growth rates on the solid medium were significantly different (P<0.01). The results showed that the strains could degrade different components of petroleum hydrocarbons by GC-MS (Gas Chromatography-Mass Spectrometry) analysis. The selected optimal strains were classified to two communities, in which one community consisted of the strain No.3, D2, D3and D52, and the other community was composed of the strain No.3, No.6, D2and D3. During 30days of crude oil degradation test of the strains in the liquid medium with the crude oil, the crude oil removal rate (CORR) of the strain D52was the highest (64.25%), the CORRs of both communities were respectively 74.55% and 72.64%, which communities have considerable potentials to be used in the bioremediation of crude-oil contaminated soil.

     

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