生物技术通报 ›› 2015, Vol. 31 ›› Issue (5): 167-172.doi: 10.13560/j.cnki.biotech.bull.1985.2015.05.026

• 研究报告 • 上一篇    下一篇

新型脱氮菌Rhizobium radiobacter的分离鉴定及其硝化特征分析

罗小溪, 高建忠, 陈再忠, 于永亮   

  1. (上海海洋大学水产与生命学院,上海 201306)
  • 收稿日期:2014-09-05 出版日期:2015-05-18 发布日期:2015-05-18
  • 作者简介:罗小溪,女,硕士研究生,研究方向:水产微生物,微生物制剂研究与应用;E-mail:446039386@qq.com
  • 基金资助:
    上海高校知识服务平台上海海洋大学水产动物遗传育种中心项目(ZF1206)

Isolation and Identification of Novel Denitrifier Strain Rhizobium radiobacter and Its Nitrifying Characterisation

Luo Xiaoxi, Gao Jianzhong, Chen Zaizhong, Yu Yongliang   

  1. College of Fisheries and Life ScienceShanghai Ocean UniversityShanghai 201306)
  • Received:2014-09-05 Published:2015-05-18 Online:2015-05-18

摘要: 旨在从污水处理厂中分离和鉴定具有硝化能力的脱氮菌。采用富集培养、平板划线分离菌株,命名为N312,并通过形态观察、16S rDNA基因序列分析及Biolog鉴定,利用正交试验法对该菌株的培养基配方进行优化。结果表明,分离获得具有硝化能力的自养脱氮菌,初步鉴定属于放射型根瘤菌(Rhizobium radiobacter),为革兰氏阴性杆菌,菌落圆形,乳白色,6 d内亚硝酸盐去除率达到100%,通过正交试验初步得到最佳培养基配方为NaNO2 1.5 g,Na2CO3 1.5 g,MgSO4·7H2O 0.25 g,FeSO4·7H2O 0.2 g,KH2PO4 0.5 g。菌株N312是一株具有研究价值的自养脱氮菌。

关键词: 脱氮菌, 16S rDNA, Biolog, 正交试验, 硝化速率

Abstract: In order to screen and identify new strain with nitrification, a denitrifier was isolated from sewage treatment plant. The strain named N312 isolated by enrichment and plate culture was identified based on its morphology characteristics, 16S rDNA gene sequence analysis and Biolog. The conditions of medium composition were optimized by orthogonal experiment. The autotrophic denitrifier strain N312 was isolated and identified as Rhizobium radiobacter, which was rod, Gram-negative, colony round and white. The results indicated that the nitrite removal efficiency by the strain could reach 100% after 6 days. The best medium was NaNO2 1.5 g, Na2CO3 1.5 g, Mg2SO4·7H2O 0.25 g, FeSO4·7H2O 0.2 g,KH2PO4 0.5 g. Strain N312 is a new autotrophic denitrifier with a highly research value.

Key words: denitrifier, 16S rDNA, Biolog, orthogonal experiment, nitrification rate