浙江农业学报 ›› 2025, Vol. 37 ›› Issue (12): 2535-2544.DOI: 10.3969/j.issn.1004-1524.20241071

• 植物保护 • 上一篇    下一篇

小麦根际真菌分离及其抗菌活性

宋英俊(), 蔡怡好, 张利霞, 吕淑芳, 李文文, 索晨美, 张昊, 侯典云, 赵杏利*()   

  1. 河南科技大学 农学院,河南 洛阳 471023
  • 收稿日期:2024-12-07 出版日期:2025-12-25 发布日期:2026-01-09
  • 作者简介:宋英俊(1996—),女,河南周口人,硕士研究生,研究方向为微生物多样性和生物防治。E-mail: 525879010@qq.com
  • 通讯作者: *赵杏利,E-mail: hellen1984@haust.edu.cn
  • 基金资助:
    河南省科技攻关项目(242102110227);河南省科技研发计划联合基金项目(222103810057)

Isolation of rhizosphere fungi from wheat and their antifungal activity

SONG Yingjun(), CAI Yihao, ZHANG Lixia, LYU Shufang, LI Wenwen, SUO Chenmei, ZHANG Hao, HOU Dianyun, ZHAO Xingli*()   

  1. College of Agriculture, Henan University of Science and Technology, Luoyang 471023, Henan, China
  • Received:2024-12-07 Online:2025-12-25 Published:2026-01-09

摘要: 根际微生物往往能促进植物的生长,保护植物免受病原菌的侵染,同时数量又远大于非根际微生物,因此从根际微生物出发,寻找防治根部病害的生防菌株是一个有效途径。小麦茎基腐病是近年来在黄淮小麦主产区日益严重的一种小麦土传真菌病害。本研究采用稀释平板法对小麦根际真菌进行分离,根据形态特征和ITS序列分析对获得的菌株进行分类地位的确定,通过平板对峙试验测定分离菌株对小麦茎基腐病病原菌的拮抗作用,并对拮抗性能较强菌株的抗菌谱进行测定。结果表明,本研究共分离获得52个菌株,分属于2门4纲4目5科6属的14种,鉴定到的6个属及其相对丰度分别为镰孢属(Fusarium)50.00%、曲霉属(Aspergillus)13.46%、枝孢属(Cladosporium) 13.46%、青霉属(Penicillium)11.54%、耙菌属(Irpex)7.69%和帚枝霉属(Sarocladium)3.85%。对小麦茎基腐病病原菌——假禾谷镰孢(Fusarium pseudograminearum)主要表现为基质竞争作用的菌株有28株,生长抑制率为17%~75%;主要表现为抗生作用的菌株有2株,分别为W-F-15和W-F-20,其中,土曲霉(Aspergillus terreus)W-F-20菌株的抗生作用最强,抑菌带宽度达15 mm,生长抑制率为62%。同时,W-F-20菌株对其他9种植物病原真菌也具有抗生作用,表现出广谱抗性。本研究为进一步开发利用防治小麦茎基腐病的真菌资源提供了理论支撑和基本材料。

关键词: 根际真菌, 小麦, 微生物多样性, 抗菌活性

Abstract:

Rizosphere microorganisms often promote plant growth, protect plants from pathogen infection, and their population size is much larger than that of non-rhizosphere microorganisms. Therefore, screening biocontrol strains for root disease management from rhizosphere microorganisms is an effective approach. Wheat crown rot, a soil-borne fungal disease, has become increasingly severe in the major wheat-producing areas of the Huang-Huai Plain in recent years. In this study, the dilution plate method was used to isolate fungi from the wheat rhizosphere. The taxonomic status of the obtained strains was determined based on morphological characteristics and ITS sequence analysis. The antagonistic effect of the isolated strains against the pathogen causing wheat crown rot was evaluated using the plate confrontation assay, and the antifungal spectrum of strains with strong antagonistic activity was further determined. The results showed that a total of 52 strains were isolated, which were classified into 14 species belonging to 6 genera, 5 families, 4 orders, 4 classes, and 2 phyla. The six identified genera and their relative abundances were as follows: Fusarium, 50.00%; Aspergillus, 13.46%; Cladosporium, 13.46%; Penicillium, 11.54%; Irpex, 7.69%; and Sarocladium, 3.85%. Among the isolated strains, 28 strains mainly exhibited substrate competition against Fusarium pseudograminearum (the pathogen of wheat crown rot), with growth inhibition rates ranging from 17% to 75%. Two strains (designated as W-F-15 and W-F-20) mainly showed antibiotic activity. Between them, Aspergillus terreus strain W-F-20 had stronger antibiotic activity, with an inhibition zone width of 15 mm and a growth inhibition rate of 62%. Meanwhile, the strain W-F-20 also exhibited antibiotic activity against 9 other plant pathogenic fungi, showing a broad-spectrum resistance. This study provides theoretical support and basic materials for the further development and utilization of fungal resources in the control of wheat crown rot.

Key words: rhizosphere fungi, wheat, microbial diversity, antifungal activity

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