浙江农业学报 ›› 2025, Vol. 37 ›› Issue (7): 1469-1480.DOI: 10.3969/j.issn.1004-1524.20240565

• 植物保护 • 上一篇    下一篇

一株茶根腐病拮抗真菌的筛选鉴定与生物学特性研究

邓玉莲1,2(), 谭琳3, 牛丽1,2, 卢前程1,2, 周玲红4, 李桂花1,2, 胡秋龙1,2,*()   

  1. 1.湖南农业大学 茶学教育部重点实验室,湖南 长沙 410128
    2.湖南农业大学 园艺学院,湖南 长沙 410128
    3.湖南农业大学 植物保护学院,湖南 长沙 410128
    4.郴州市农业科学研究所,湖南 郴州 423001
  • 收稿日期:2024-06-27 出版日期:2025-07-25 发布日期:2025-08-20
  • 作者简介:邓玉莲(2000—),女,湖南岳阳人,硕士研究生,研究方向为茶树病虫害。E-mail:2214194556@qq.com
  • 通讯作者: *胡秋龙,E-mail:huqiulongnet@126.com
  • 基金资助:
    国家重点研发计划(2022YFD16000803-6);湖南省重点研发计划(2022NK2051);湖南省科技创新重大项目(2021NK1020)

Screening and identification of an antagonistic fungus strain against root rot disease in tea plants and its biological characteristics

DENG Yulian1,2(), TAN Lin3, NIU Li1,2, LU Qiancheng1,2, ZHOU Linghong4, LI Guihua1,2, HU Qiulong1,2,*()   

  1. 1. Key Lab of Tea Science, Ministry of Education, Hunan Agricultural University, Changsha 410128, China
    2. College of Horticulture, Hunan Agricultural University, Changsha 410128, China
    3. College of Plant Protection, Hunan Agricultural University, Changsha 410128, China
    4. Chenzhou Institute of Agricultural Science, Chenzhou 423001, Hunan, China
  • Received:2024-06-27 Online:2025-07-25 Published:2025-08-20

摘要: 采用平板对峙法,从茶树根际土壤中筛选出一株对茶根腐病病原菌具有拮抗效果的真菌,并利用形态学和分子生物学方法对其进行鉴定,研究其生物学特性,测定其抑菌谱、代谢物质抑菌能力和产胞外水解酶的活性。结果表明,分离筛选出的菌株FX2为橘青霉(Penicillium citrinum),对茶树根腐病病原菌Fusarium cugenangense具有较好的拮抗作用,抑菌率为72.98%。菌株FX2对碳氮比的响应不敏感,最适碳源是乳糖,最适氮源是蛋白胨或酵母提取物,最适硫酸盐为MgSO4或K2SO4,对NaCl的耐受范围为0~140 g·L-1,最适pH值为6,最高耐受温度为60 ℃,紫外光照射会对该菌株的生长产生一定的抑制作用。该菌株对链格孢菌(Alternaria alternata)、禾谷镰孢菌(Fusarium graminearum)、大斑病凸脐蠕孢(Exserohilum turcicum)、柑橘间座壳菌(Diaporthe citri)、尖孢镰刀菌(Fusarium oxysporum)、葱刺盘孢(Colletotrichum circinans)、茶炭疽病菌刺盘孢菌(Colletotrichum camelliae)、茶拟盘多毛孢(Pseudopestalotiopsis theae)8种植物病原菌的抑制率均在50%以上,具有较好的抗菌广谱性。该菌株5%、10%、15%、20%的无菌发酵滤液对茶树根腐病病原菌的抑制率分别为35.12%、45.98%、52.80%、59.46%,非挥发性代谢物、挥发性代谢物对病原菌的抑制率分别为71.73%、22.14%。此外,该菌株还具有分泌蛋白酶、淀粉酶、几丁质酶和纤维素酶的能力。综上,分离得到的菌株FX2是具有较好前景的茶树根腐病病原菌生防资源。

关键词: 茶树, 根腐病, 拮抗真菌, 抑制率, 生物学特性

Abstract:

In the present study, a fungal isolate with antagonistic effect on tea root rot pathogen was screened from the rhizosphere soil of tea plants infected by tea root rot pathogen through plate confrontation method. The isolated strain was identified by the morphological and molecular biology methods, and its biological characteristics were studied, as well as its antimicrobial spectrum, antimicrobial ability of metabolites and extracellular hydrolase activities. The results showed that the obtained strain FX2 was finally identified as Penicillium citrinum, which exhibited an inhibition rate of 72.98% against the pathogen Fusarium cugenangense of tea root rot. The strain FX2 was relatively insensitive to the carbon-nitrogen ratio. The suitable carbon source of this strain was lactose, the suitable nitrogen source was peptone or yeast extract, the optimal sulfate was MgSO4 or K2SO4. The tolerance range of this strain to NaCl was 0-140 g·L-1, the optimal pH value was 6, and the maximum withstand temperature was 60 ℃. The ultraviolet light irradiation exhibited certain inhibitory effect on the growth of this strain. The inhibition rate of this strain against other 8 plant pathogens (including Alternaria alternata, Fusarium graminearum, Exserohilum turcicum, Diaporthe citri, Fusarium oxysporum, Colletotrichum circinans, Colletotrichum camelliae, Pseudopestalotiopsis theae) were higher than 50%, indicating broad antibacterial spectrum. The inhibition rate of 5%, 10%, 15% and 20% sterile fermentation filtrate against root rot pathogen was 35.12%, 45.98%, 52.80% and 59.46%, respectively, and the inhibition rate of non-volatile metabolites and volatile metabolites against root rot pathogen was 71.73% and 22.14%, respectively. Besides, this strain also had the ability to secrete proteases, amylases, chitinases and cellulases. In conclusion, the isolated strain FX2 was a promising biocontrol resource for tea root rot.

Key words: tea tree, root rot, antagonistic fungi, inhibition rate, biological properties

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