浙江农业学报 ›› 2019, Vol. 31 ›› Issue (5): 766-776.DOI: 10.3969/j.issn.1004-1524.2019.05.12

• 植物保护 • 上一篇    下一篇

杜仲内生细菌拮抗小麦赤霉病菌研究

陈小洁, 王其, 张欣悦, 丁婷*   

  1. 安徽农业大学 植物保护学院,安徽 合肥 230036
  • 收稿日期:2018-10-29 出版日期:2019-05-25 发布日期:2019-05-23
  • 通讯作者: *丁婷,E-mail: dingting98@126.com
  • 作者简介:陈小洁(1995—),女,江苏宿迁人,硕士研究生,主要从事植物病害生物防治研究。E-mail: XJie_C@126.com
  • 基金资助:
    国家重点研发计划子课题(2017YFD0201106-09)

Study on endophytic bacteria isolated from Eucommia ulmoides with antimicrobial activity against Fusarium graminearum

CHEN Xiaojie, WANG Qi, ZHANG Xinyue, DING Ting*   

  1. School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
  • Received:2018-10-29 Online:2019-05-25 Published:2019-05-23

摘要: 为明确杜仲内生细菌对小麦赤霉病菌的抑菌活性,利用稀释涂布法对杜仲的内生细菌进行分离纯化;并以小麦赤霉病菌为指示菌,对杜仲内生细菌进行了对峙培养和盆栽防效等研究;通过分子鉴定确定拮抗菌株的分类地位,深入探讨拮抗菌株的抑菌机制。结果显示:杜仲中共分离获得104株内生细菌,其中内生细菌DZSG09、DZSJ16、DZSG23对小麦赤霉菌均具有较好的抑菌效果,且DZSG23对小麦赤霉病菌的抑制率达到69.04%;小麦盆栽试验结果表明,菌株DZSG23对小麦赤霉病的防治效果最佳,接种小麦赤霉病菌第10天,DZSG23处理组的防治效果达到40.89%;16S rDNA序列分析表明,DZSG23为芽孢杆菌属微生物,显微观察发现其可引起小麦赤霉病菌菌丝膨大、畸形;且DZSG23菌株的菌悬液、次级代谢产物对小麦赤霉病菌分生孢子萌发的影响较低,但致畸作用较明显,DZSG23菌悬液(1×106 CFU·mL-1)和次级代谢产物(10 mg·mL-1)处理36 h,小麦赤霉病菌分生孢子的畸形率分别达到57.70%和36.67%,均能造成小麦赤霉病菌分生孢子膨大、畸形,导致芽管肿胀、扭曲。本研究结果为拮抗菌株DZSG23的应用提供了科学依据。

关键词: 杜仲, 芽孢杆菌属, 小麦赤霉病菌, 抑菌活性

Abstract: This study was carried out to assess the inhibitory activities of endophytic bacteria from Eucommia ulmoides against Fusarium graminearum. The endophytic bacteria from E. ulmoides were isolated and purified, and the antimicrobial activities of endophytic bacteria against F. graminearum were examined using confront antibiotic culture experiment, disease-control pot experiment. Then, the antimicrobial strain was identified at molecular level and its resistance mechanism against F. graminearum was analyzed. The results indicated 104 endophytic bacteria were isolated from the leaves, stems and roots of E. ulmoides, and DZSG09, DZSJ16 and DZSG23 had strong inhibition against F. graminearum, inhibitory rate of DZSG23 on F. graminearum was 69.04%. Moreover, control efficacy of DZGS23 against F. graminearum was 40.89% by pot experiment after inoculation for 10 d. 16S rDNA sequence analysis showed that DZGS23 belonged to Bacillus. DZGS23 could cause the abnormity and tortuosity of mycelial of phytopathogen and so on. Lastly, bacterial suspension and secondary metabolite of DZSG23 had strong teratogenic effect on conidia of F. graminearum conidia. Deformity rates of conidia were 57.70% and 36.67% after treated with suspension of DZSG23 (1×106 CFU·mL-1) and its secondary metabolites (10 mg·mL-1) for 36 h, and they could cause abnormality of conidia and made tubes swollen and contort. However, the bacterial suspension and secondary metabolites of DZSG23 weakly affected germination of F. graminearum conidia. The results afforded scientific basis for DZSG23 application.

Key words: Eucommia ulmoides, Bacillus, Fusarium graminearum, antimicrobial activity

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