食品科学 ›› 2011, Vol. 32 ›› Issue (21): 207-209.doi: 10.7506/spkx1002-6630-201121042

• 生物工程 • 上一篇    下一篇

沙漠生物结皮高产胞外多糖菌株的筛选与鉴定

王正荣1,2,生吉萍1,田小磊1,武婷婷1,刘万振1,程凡升1,矫玉翠1,申 琳1,*   

  1. 1.中国农业大学食品科学与营养工程学院 2.河南科技学院食品学院
  • 出版日期:2011-11-15 发布日期:2011-11-11
  • 基金资助:
    农业部公益性行业(农业)科研专项(200803033)

Isolation and Identification of a High Exopolysaccharide-producing Strain from Biological Soil Crusts on Sand Dunes

WANG Zheng-rong1,2,SHENG Ji-ping1,TIAN Xiao-lei1,WU Ting-ting1,LIU Wan-zhen1,CHENG Fan-sheng1, JIAO Yu-cui1,SHEN Lin1,*   

  1. (1. College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; 2. College of Food Science, Henan Institute of Science and Technology, Xinxiang 453003, China)
  • Online:2011-11-15 Published:2011-11-11

摘要: 采用传统的分离纯化方法从沙漠生物结皮中分离到27株产胞外多糖菌株,并通过苯酚-硫酸法从中复筛,筛选到一株产多糖量为7445.80mg/L的菌株XJ-27。根据菌株的形态学特征、生理生化鉴定方法初步鉴定为苏云金芽孢杆菌(Bacillus thuringiensis);通过16S rDNA基因序列分析对该菌株进行了鉴定,PCR扩增得到1452bp的序列,PCR产物序列通过Blast软件在NCBI网站中进行同源性比较,通过MEGA4.0软件绘制系统发育树,结果进一步确认了该菌的地位,XJ-27在细菌系统发育分类学上也归属为苏云金芽孢杆菌。

关键词: 沙漠生物结皮, 胞外多糖, 鉴定, 苏云金芽孢杆菌

Abstract: Twenty-seven stains producing exopolysaccharides were isolated from biological soil crusts in the Gurbantunggut Desert, Xinjiang by the traditional method. A strain with 7445.80 mg/L exopolysaccharide-producing activity was picked out of them by phenol-sulfuric acid method and named as XJ-27. Based on phenotypic and physiological-chemical characterization, XJ-27 was primarily identified as Bacillus thuringiensis and further confirmed through 16S rDNA sequence analysis, resulting in a 1452 bp PCR amplification sequence, homology comparison with NCBI databases using the software Blast and phylogenetic tree construction using the software MEGA 4.0.

Key words: biological soil crusts, exopolysaccharides, identification, Bacillus thuringiensis

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