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96孔板高通量选育嗜线虫致病杆菌高产帕克素菌株

张易1, 李佳1, 钟娟2, 邱德文1, 杨秀芬1   

  1. 1. 中国农业科学院植物保护研究所/农业部作物有害生物综合治理重点实验室, 北京 100081;2. 中国科学院成都生物研究所 成都 610041
  • 收稿日期:2012-09-12 修回日期:1900-01-01 出版日期:2013-08-08 发布日期:2013-08-08
  • 通讯作者: 杨秀芬,研究员,E-mail:yangxiufen@caas.net.cn。

Screening of High Yield Pekingmycin-producing Strains of Xenorhabdus nematophila var. pekinense by Cultivation in 96-well Microtiter Plates

ZHANG Yi1, LI Jia1, ZHONG Juan2, QIU Dewen1, YANG Xiufen1   

  1. 1. Key Laboratory of Pest Management in Crops, Ministry of Agriculture/Institute of Plant Protection, Chinese Academy of Agricultural Science, Beijing 100081;2. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041
  • Received:2012-09-12 Revised:1900-01-01 Online:2013-08-08 Published:2013-08-08

摘要: 帕克素(pekingmycin)是嗜线虫致病杆菌北京变种Xenorhabdus nematophilus var. pekinense CB6菌株代谢产生的广谱抗生素。研究证明帕克素对马铃薯晚疫病和辣椒疫病均具有较好的田间控制效果。为了进一步提高帕克素产量,为实现产业化奠定基础,本文首次用96孔板高通量筛选技术进行了帕克素高产菌株的筛选。将原始菌株CB6用紫外、微波和亚硝基胍诱变后在96孔板固体培养基上培养72 h,35%甲醇浸提24 h,根据浸提液OD312紫外吸收值和抑菌圈直径筛选出10株活性较高的正突变株。但由于存在遗传不稳定现象,故对其中一株优良突变株90#(菌株编号为90)进行了二次累加诱变,经初筛和复筛,得到4株比出发菌株抑菌圈显著增加的突变株,较出发菌株抑菌圈直径提高了6.39%~11.94%。对其中的2株突变株进行了遗传稳定性测定,结果表明,连续培养6代后,突变株抑菌圈直径无显著变化,菌株特性能稳定遗传。

Abstract: Pekingmycinis a broad spectrum antibiotic produced by X.nematophila var. pekinense CB6, a bacterial strain carried in intestine ofentomopathogenicnematodeSteinernema carpocapsae. Previous study showed pekingmycin was suppresive against Phytophthora blight of potato and pepper in fields. In order to improve the Pekingmycin productivity, we treated the parental strain CB6 with ultraviolet (UV), microwave (MW) and nitrosoguanidine (NTG) and cultivated in 96 well microplates for mutants screening. Pekingmycin component was extracted with 35% methanol for 24 h. High activity strains were determined based on UV absorption at 312 wavelength and antibiotic assay against B.subtilis on solid plate. Four mutant strains with high antibiotic activity were screened out and their inhibitory zone was increased by 6.39%-11.94% in comparison with the original strain CB6. Bioassay showed no significant change in inhibitory zone after 6 generations, indicating the mutant strains are genetically stable in highly antibiotic activity.

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