山东科学 ›› 2025, Vol. 38 ›› Issue (4): 46-55.doi: 10.3976/j.issn.1002-4026.20240078

• 农业微生物 • 上一篇    下一篇

鱼腥草白绢病病原菌的分离鉴定及其生防木霉的筛选

王兴强1,2(), 李红梅1, 徐维生3, 魏艳丽1, 陈凯1, 李纪顺1,*()   

  1. 1.齐鲁工业大学(山东省科学院) 山东省科学院生态研究所,山东 济南 250103
    2.齐鲁工业大学(山东省科学院)生物工程学院,山东 济南 250353
    3.沂水县诸葛镇农业服务综合中心,山东 临沂 276422
  • 收稿日期:2024-06-20 出版日期:2025-08-20 发布日期:2025-08-05
  • 通信作者: 李纪顺 E-mail:wangxingqiangwork@foxmail.com;yewu2@sdas.org
  • 作者简介:王兴强(1997—),男,硕士研究生,研究方向为农业微生物。E-mail:wangxingqiangwork@foxmail.com
  • 基金资助:
    山东省科学院科教产融合试点工程国际合作项目(2022GH011);山东省科学院科教产融合试点工程国际合作项目(2022GH012);济南市高校“20条”(自主培养创新团队)项目(2020GXRC003)

The isolation and identification of the southern blight-causing pathogen in Houttuynia cordata Thunb. and screening of its biocontrol agent Trichoderma spp.

WANG Xingqiang1,2(), LI Hongmei1, XU Weisheng3, WEI Yanli1, CHEN Kai1, LI Jishun1,*()   

  1. 1. Ecology Institute of Shandong Academy of Sciences, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250103, China
    2. School of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
    3. Zhuge Agricultural Service Center, Yishui County, Linyi 276422,China
  • Received:2024-06-20 Online:2025-08-20 Published:2025-08-05
  • Contact: LI Jishun E-mail:wangxingqiangwork@foxmail.com;yewu2@sdas.org

摘要:

白绢病是危害鱼腥草生长的重要病害之一。为明确引起鱼腥草白绢病的病原菌,对湖北当阳地区患白绢病鱼腥草进行组织分离,并对其进行形态学和分子生物学鉴定,同时以分离的病原菌为靶标筛选拮抗木霉菌株。结果表明分离获得的病原菌为罗氏阿太菌(Athelia rolfsii),通过平板对峙共筛选出3株抑菌率大于95%的木霉菌,其中棘孢木霉QT21918具有菌丝重寄生及溶菌现象,其挥发性和非挥发性代谢产物的抑菌率分别为38.21%和50.54%,离体叶片实验显示,该菌株对病斑扩展的抑制率为67.7%。盆栽实验表明同时接种棘孢木霉QT21918和病原菌以及先接种棘孢木霉QT21918 7d后再接种病原菌的防治效果最好,防效都为100%。以上结果表明棘孢木霉QT21918对鱼腥草白绢病具有一定的生防潜力。

关键词: 鱼腥草, 病原菌, 生物防治, 木霉

Abstract:

Southern blight is a key disease that harms the growth of Houttuynia cordata Thunb. To identify the pathogenic fungi that cause southern blight in H. cordata, tissue isolation was conducted on H. cordata samples infected with southern blight from Dangyang, Hubei province, China. Furthermore, screening was conducted to determine the morphology and molecular biology of the infected plant, and the isolated pathogens were screened against the antagonist Trichoderma. The results identified Athelia rolfsii as isolated pathogenic fungi. Three Trichoderma strains with fungal inhibition rate greater than 95% were screened through a plate confrontation assay. Among them, Trichoderma asperellum QT21918 exhibited the effects of hyphal hyperparasitism and fungal lysis on A. rolfsii and its inhibitory rates for volatile and nonvolatile metabolites were 38.21% and 50.54%, respectively. In vitro leaf tests demonstrated that this strain had a fungal inhibitory rate of 67.7% against the spread of the lesions associated with southern blight disease. A pot-based experiment showed that optimal control effect was achieved by simultaneously inoculating T. asperellum QT 21918 and the pathogen as well as by first inoculating T. asperellum QT21918 for 7 days and then inoculating the pathogen, both methods achieving a control effect of 100%. The above results indicate that T. asperellum QT21918 has potential as a biocontrol agent against southern blight in H. cordata.

Key words: Houttuynia cordata, pathogenic fungi, biological control, Trichoderma

中图分类号: 

  • S476

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