湖北农业科学 ›› 2018, Vol. 57 ›› Issue (8): 61-65.doi: 10.14088/j.cnki.issn0439-8114.2018.08.016

• 植物保护 • 上一篇    下一篇

青海极端生境植物根围促生菌分离鉴定及生物活性分析

吴晓晖, 谢永丽, 梁欣, 张英, 芦光新   

  1. 青海大学农牧学院/高原草地资源与生态省部共建重点实验室,西宁 810016
  • 收稿日期:2017-07-24 发布日期:2018-04-25
  • 通讯作者: 谢永丽(1971-),女,青海西宁人,副教授,博士,主要从事资源微生物学研究,(电子信箱)986237342@qq.com。
  • 作者简介:吴晓晖(1994-),女,青海西宁人,在读硕士研究生,研究方向为资源微生物学,(电话)15597025322(电子信箱)377890164@qq.com
  • 基金资助:
    青海省科技厅应用(基础)研究项目(2015-ZJ-732); 青海省科技厅国际合作项目(2013-H-805); 国家自然科学基金项目(31660543)

Isolation and Identification of Growth-promoting Rhizosphere Strains Isolated from Extreme Environment and Its Biological Activity Analysis

WU Xiao-hui, XIE Yong-li, LIANG Xin, ZHANG Ying, LU Guang-xin   

  1. College of Agricultural and Animal Husbandry,Qinghai University/Key Laboratory of Altiplano Grassland Resource and Ecology,Province and Education Ministry,Xining 810016,China
  • Received:2017-07-24 Published:2018-04-25

摘要: 通过平板对峙试验以分离筛选自青海托格若格半荒漠沙地、托素湖盐碱地、海北爆轰试验场3个极端生境植被根围的菌株为供试菌株,进行拮抗活性检测;采用16S rDNA及gyrB基因序列分析鉴定菌株;采用CMC法及Gram染色法测定菌株降解纤维素活性;对具降解纤维素活性的拮抗菌株进行促生活性测定。结果表明,菌株TGRG3、TGRG7、TSH5分别对油菜菌核菌(Sclerotinia sclerotiorum)、小麦赤霉菌(Fusarium graminearum)、小麦长孢蠕菌(Helminthosporium tritici-vulgaris)具有拮抗活性,抑菌圈平均直径均>20 mm。3株菌株均被鉴定为枯草芽孢杆菌(Bacillus subtilis),均具降解纤维素及促植物生长活性。

关键词: 枯草芽孢杆菌(Bacillus subtilis), 分子鉴定, 降解纤维素活性, 拮抗活性, 促生

Abstract: The strains were isolated from three representative extreme sample area including Tuogeruoge semi-desert sand,Tuosu Lake salt and alkali land,detonation test site of Haibei in Qinghai province. Antagonistic activity detection was used to check antagonistic activity of these strains. Polyphasic molecular taxonomy methods including gyrB and 16S rDNA partial sequence analysis were used to identify these strains. The CMC plate test and Gram staining method were used to analysis cellulose degradation of the bio-control strains. The results showed that three strains including TGRG3,TGRG7 and TSH5 could present distinct antagonistic activity to Sclerotinia sclerotiorum,Fusarium graminearum and Helminthotporium tritici-vulgaris,and diameters of the inhibition zone were all longer than 20 mm. The strains of TGRG3,TGRG7 and TSH5 were identified as Bacillus subtilis. All of three biocontrol B. subtilis strains had cellulose-degradation activity and promotion function on growth of plant.

Key words: Bacillus subtilis, molecular identification, cellulose-degradation activity, antagonistic activity, growth-promoting

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