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草业学报 ›› 2025, Vol. 34 ›› Issue (8): 179-190.DOI: 10.11686/cyxb2024365

• 研究论文 • 上一篇    

棘孢木霉bai5对紫花苜蓿根腐病病原菌的抑菌效果及其促生作用研究

杜化迎1(), 张玉洲2(), 赵楠2, 虎妍1, 王一冬1, 刘腾达1, 顾沛雯1, 于泽洋1()   

  1. 1.宁夏大学农学院,宁夏 银川 750021
    2.宁夏大学生命科学学院,宁夏 银川 750021
  • 收稿日期:2024-09-24 修回日期:2024-12-13 出版日期:2025-08-20 发布日期:2025-06-16
  • 通讯作者: 于泽洋
  • 作者简介:E-mail: yzynxu@126.com
    杜化迎(2000-),女,河北邢台人,在读硕士。E-mail: 2190880851@qq.com
    张玉洲(1994-),女,内蒙古呼和浩特人,在读博士。E-mail: zyzslbc@163.com第一联系人:共同第一作者
  • 基金资助:
    宁夏重点研发计划项目(2023BCF01026-04);高等学校科学研究项目(NYG-2024-029)

Trichoderma asperellum bai5 inhibits root rot pathogens of alfalfa (Medicago sativa) and promotes alfalfa plant growth

Hua-ying DU1(), Yu-zhou ZHANG2(), Nan ZHAO2, Yan HU1, Yi-dong WANG1, Teng-da LIU1, Pei-wen GU1, Ze-yang YU1()   

  1. 1.College of Agriculture,Ningxia University,Yinchuan 750021,China
    2.School of Life Sciences,Ningxia University,Yinchuan 750021,China
  • Received:2024-09-24 Revised:2024-12-13 Online:2025-08-20 Published:2025-06-16
  • Contact: Ze-yang YU

摘要:

为挖掘对紫花苜蓿根腐病致病菌具有抑制作用的有益菌株,本研究采用稀释分离法从白桦根围土壤中分离、获得1株真菌bai5,通过形态学和分子生物学鉴定,确定为棘孢木霉。以紫花苜蓿常见的7种根腐病病原菌(燕麦镰刀菌FAV-7、木贼镰刀菌FEQ-10、锐顶镰刀菌FAC-11、厚垣镰刀菌FCH-13、三线镰刀菌FTR-14、尖孢镰刀菌FOX-15、茄病镰刀菌FSO-16)为靶标菌,利用两点对峙法、固体稀释法、平板对扣法综合评估bai5菌株对病原菌的抑制作用,结果表明,在对峙培养下,bai5对7种病原菌的抑制率均大于69%;在发酵滤液抑菌试验中,bai5对FAC-11、FTR-14、FEQ-10、FCH-13、FAV-7和FSO-16的抑制率分别为63.14%、49.80%、40.78%、33.33%、16.08%、8.20%,而对FOX-15无抑制效果;棘孢木霉bai5的挥发性物质对FTR-14和FAC-11的抑制率分别高达74.51%、72.00%。通过对bai5菌株的生物学特性和促生特性分析,结果表明,棘孢木霉bai5生长速度快,不仅有较强的抗逆能力,还具有固氮和产纤维素酶能力。通过盆栽试验,测定棘孢木霉bai5对紫花苜蓿生长和生理指标的影响,结果表明,bai5能够显著提高紫花苜蓿的鲜重、地上部长、干重、叶绿素含量和可溶性糖含量。综上,棘孢木霉bai5是具有较高开发价值的生防真菌,可以抑制7种苜蓿根腐病菌生长并显著促进苜蓿生长。

关键词: 棘孢木霉, 分离鉴定, 苜蓿根腐病, 镰刀菌, 抑菌效果, 促生

Abstract:

The aim of this work was to screen for fungal biocontrol strains with inhibitory effects on the pathogens causing root rot of alfalfa (Medicago sativa). To this end, the fungal strain bai5 was isolated and obtained from the soil surrounding the roots of Betula platyphylla by the dilution isolation method. This strain was identified as Trichoderma asperellum through morphological and molecular biological identification methods. Seven common root rot pathogens of alfalfa (Fusarium avenaceum FAV-7, Fusarium equiseti FEQ-10, Fusarium acuminatum FAC-11, Fusarium chlamydosporum FCH-13, Fusarium tricinctum FTR-14, Fusarium oxysporum FOX-15, Fusarium solani FSO-16) were used as target pathogens, and the inhibitory effect of strain bai5 on these pathogens was comprehensively evaluated using the two-point standoff method, the solid dilution method, and the plate-pair buckling method. The inhibitory rate of strain bai5 against the seven fungal pathogens was higher than 69% in the standoff culture test. In the fermentation filtrate inhibition test, strain bai5 inhibited the growth of FAC-11, FTR-14, FEQ-10, FCH-13, FAV-7, and FSO-16 by 63.14%, 49.80%, 40.78%, 33.33%, 16.08%, and 8.20%, respectively, but it had no inhibitory effect on FOX-15. The volatile compounds of strain bai5 inhibited the growth of FTR-14 and FAC-11 by up to 74.51% and 72.00%, respectively. Analyses of the biological properties and growth-promoting characteristics of strain bai5 showed that it grows fast, is strongly stress resistant, and has nitrogen-fixation and cellulase-producing abilities. The effect of T. asperellum bai5 on the growth and physiological indexes of pot-grown alfalfa plants was determined. The results show that bai5 significantly increased the fresh weight, height of above-ground parts, dry weight, chlorophyll content, and soluble sugars content of alfalfa plants. In conclusion, T. asperellum bai5 can inhibit the growth of at least seven root rot fungi of alfalfa and significantly promote alfalfa plant growth. Therefore, it is a biocontrol fungus with high development potential.

Key words: Trichoderma asperellum, separation and identification, alfalfa root rot disease, Fusarium, antibacterial effect, promote growth