生物技术通报 ›› 2014, Vol. 0 ›› Issue (4): 147-151.

• 研究报告 • 上一篇    下一篇

产胞外多糖植物内生菌的分离和鉴定

黄怡诚, 刘旸, 庞昕, 马中瑞, 韩东雷, 陈敏   

  1. (山东大学生命科学院 微生物技术国家重点实验室,济南 250100)
  • 收稿日期:2013-10-09 出版日期:2014-04-29 发布日期:2014-04-29
  • 作者简介:黄怡诚,男,研究方向:糖生物学, E-mail:61828624@qq.com;刘旸 同为本文第一作者
  • 基金资助:
    国家自然科学基金项目(31270983,31070824),教育部留学回国人员科研启动基金资助项目第45批,山东省自然科学基金(2009ZRB019SQ)

Isolation and Characterization of Endophytic Strains Producing Exopolysaccharide

Huang Yicheng, Liu Yang, Pang Xin, Ma Zhongrui, Han Donglei, Chen Min   

  1. (The State Key Laboratory of Microbial Technology,School of Life Sciences,Shandong University,Jinan 250100)
  • Received:2013-10-09 Published:2014-04-29 Online:2014-04-29

摘要: 利用平板涂布法从胡萝卜、芦荟、土豆、地瓜和紫薯样品中分离得到24株细菌,利用苯酚硫酸法测定菌株胞外多糖的产量,最终得到3株高产胞外多糖的细菌菌株25-Z-1、25-Z-3和12-L-6。经16S rDNA序列测定及系统发育分析,从紫薯样品中分离得到的25-Z-1与Bacillus pumilus strain ST277处于同一分支,相似性达到100%;25-Z-3与Bacillus cereus strain Se05 处于同一分支,相似性达到99%;从芦荟中分离得到的12-L-6与Bacillus sp. GZT 处于同一分支,相似性为99%。在LB液体培养基中,发酵温度30℃,摇床转数170 r /min条件下,发酵7 d后胞外多糖产量可分别达30.3 mg/L、29.1 mg/L及28.2 mg/L。

关键词: 植物内生菌, 胞外多糖, 16S, rDNA

Abstract: In this study, 24 strains were isolated from carrot, aloe, potato, sweet potato and purple potato. As screening by phenol-sulfuric acid assay, three strains, 25-Z-1, 25-Z-3 and 12-L-6, were proved to be as high exopolysaccharide producing strains. The results of 16S rDNA sequence determination showed that 25-Z-1 and 25-Z-3 isolated from purple potato was about 100% identity compared with Bacillus pumilus strain ST277 and 99% identity compared with Bacillus cereus strain Se05, respectively. Meanwhile the 12-L-6 isolated from aloe identified as Bacillus sp. GZT, with the similarity is of 99%. Culture in LB medium, 30℃ and 170 r/min for 7 d, yield of EPS could reach to 30.3 mg/L, 29.1 mg/L and 28.2 mg/L, respectively.

Key words: Endophyte, Exopolysaccharide, 16S, rDNA