生物技术通报 ›› 2018, Vol. 34 ›› Issue (4): 133-138.doi: 10.13560/j.cnki.biotech.bull.1985.2017-0852

• 研究报告 • 上一篇    下一篇

拆分网络分析22株蛹虫草亲缘关系及高产虫草素菌株初筛

刘建兵, 戚梦, 杜苑如, 傅俊生, 胡开辉   

  1. 福建农林大学生命科学学院生物工程系,福州 350002
  • 收稿日期:2017-10-13 出版日期:2018-04-20 发布日期:2018-05-04
  • 作者简介:刘建兵,男,硕士研究生,研究方向:虫草种质资源收集及虫草素抗肿瘤活性;E-mail:953897572@qq.com
  • 基金资助:
    国家自然科学基金项目(81503187),福建省食用菌产业技术重大研发平台(2014N2001),福建省重大农技推广服务试点项目(KNJ-153011-4),福建省中青年教师教育科研项目(JA15177),福建农林大学现代种业工程研究院建设经费

Genetic Relationship Analysis of 22 Cordyceps militaris Based on Split Network and Preliminary Screening of High-yield Cordycepin Strains

LIU Jian-bing, QI Meng, DU Yuan-ru, FU Jun-sheng, HU Kai-hui   

  1. Department of Bioengineering,College of Life Sciences,Fujian Agriculture and Forestry University,Fuzhou 350002
  • Received:2017-10-13 Published:2018-04-20 Online:2018-05-04

摘要: 对22株蛹虫草Cordyceps militaris的ITS序列进行分析,并基于拆分网络法splits networks,分析供试菌株的亲缘关系,再进一步比较供试菌株发酵产虫草素能力,筛选出高产虫草素菌株。结果表明,22株蛹虫草的ITS序列长度在518-539 bp之间,对位排列后有39个差异位点,其中有12个简约信息位点,并且都发生在ITS1区;构建的拆分网络显示22株虫草聚为3个类群,每个类群因其特有的碱基替换而区别于其他菌株;22株蛹虫草发酵产虫草素性能差异很大,且虫草素主要存在于胞外液中,MF27的胞外液虫草素含量为332.74 mg/L,显著高于其它菌株(P<0.05)。本研究为研究蛹虫草菌株间的系统关系和种质资源管理提供了依据。

关键词: 蛹虫草, rDNA ITS序列, 拆分网络, 亲缘关系, 差异位点, 高效液相色谱

Abstract: We used the split network based on ITS sequence for analyzing the genetic relationships of 22 Cordyceps militaris strains,and we compared the capacities of strains producing cordycepin and screened the strains highly yielding cordycepin. The results showed that length of ITS sequence(including ITS1,5.8S rDNA and ITS 2)of 22 strains was 518-539 bp,there were 39 variable sites and 12 parsimony informative sites in the ITS sequence after alignment,and all occurred in the ITS1 region. The split network showed that 22 C. militaris strains were roughly divided into 3 clades,and the strains of each clade were distinguished from others by its unique base substitutions. Cordycepin was mainly in extracellular liquid,cordycepin contents by the 22 strains varied significantly,and the content of cordycepin in MF 27 strain was the highest at 332.74 mg/L,significantly higher than that by other strains(P<0.05). This study provides a basis for understanding the systematic relationship among strains of C. militaris and the management of germplasm resources.

Key words: Cordyceps militaris, rDNA ITS sequences, split network, genetic relationship, variable sites, HPLC