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草业学报 ›› 2017, Vol. 26 ›› Issue (1): 142-148.DOI: 10.11686/cyxb2016238

• 研究论文 • 上一篇    下一篇

菟丝子生防菌“鲁保一号”生物学特性及T-DNA插入突变体库的构建

李健, 李美*, 高兴祥, 房锋, 董连红   

  1. 山东省农业科学院植物保护研究所,山东 济南250100
  • 收稿日期:2016-06-07 出版日期:2017-01-20 发布日期:2017-01-20
  • 通讯作者: E-mail: limei9909@163.com
  • 作者简介:李健(1986-),男,山东临沂人,助理研究员,博士。E-mail: lijian910@163.com
  • 基金资助:
    山东省自然科学基金(ZR2015CQ014)资助

Biological characteristics of Lubao No.1 biological control agent (Colletotrichum gloeosporioides) and construction of a T-DNA insertional mutant library

LI Jian, LI Mei*, GAO Xing-Xiang, FANG Feng, DONG Lian-Hong   

  1. Institute of Plant Protection, Shandong Academy of Agricultural Science, Jinan 250100, China
  • Received:2016-06-07 Online:2017-01-20 Published:2017-01-20

摘要: “鲁保一号”菌剂对杂草菟丝子生防效果良好,但是受制于菌种退化问题其进一步应用受到限制。本研究通过对“鲁保一号”菌的生物学性状进行分析,明确其菌种培养特性:最佳培养基为PDA培养基,最佳培养温度为25~28 ℃,最佳培养pH值为5~8。同时,利用农杆菌介导的遗传转化方法进行“鲁保一号”菌株转化,并初步构建了约含2300个阳性转化子的T-DNA插入突变体库。转化子经连续继代6次培养后潮霉素B抗性稳定,随机挑取的20个转化子均能PCR克隆出潮霉素基因,转化子是由T-DNA插入引起的,且筛选抗性能够稳定遗传。以上研究为后期筛选获得致病力稳定的遗传改良菌株,并进一步应用奠定了基础。

Abstract: The application of Lubao No.1 microbial agent has been limited because of its degradation, although the strain shows high bio-herbicidal activity against Cuscuta chinensis. The results of an investigation of the biological characteristics of Lubao No.1 showed that the optimal mycelium growth medium was PDA medium. The optimal culture temperature is 25-28 ℃, and optimal initial pH of culture media was 5-8. Construction of a T-DNA insertional mutant library of Lubao No.1 using an Agrobacterium mediated transformation method, produced about 2300 positive transformants. Randomly selected transformants were all resistant to hygromycin B. A hygromycin gene fragment was amplified by PCR from all 20 tested mutants, indicating that the resistance of the transformants to hygromycin B was stable and was caused by the inserted T-DNA. This study laid the foundation for obtaining further applications of a genetically modified Colletotrichum strains with stable pathogenicity.