浙江农业学报 ›› 2023, Vol. 35 ›› Issue (7): 1662-1671.DOI: 10.3969/j.issn.1004-1524.20221161

• 植物保护 • 上一篇    下一篇

枸杞内生真菌的筛选、鉴定及其生防作用

候彩霞1,2(), 丁德东1,2, 何静1,2,*(), 赵吉桃1,2, 李彦湘1,2, 赵倩1,2, 张崇庆1,2, 李南1,2   

  1. 1.甘肃农业大学 林学院,甘肃 兰州 730070
    2.甘肃省枸杞无害化栽培工程研究中心,甘肃 兰州 730070
  • 收稿日期:2022-08-11 出版日期:2023-07-25 发布日期:2023-08-17
  • 通讯作者: *何静,E-mail:hejing268@aliyun.com
  • 基金资助:
    甘肃省自然基金重点项目(20JR10RA508);国家自然科学基金(32060341)

Screening, identification and biocontrol effect of endophytic fungus from Lycium barbarum

HOU Caixia1,2(), DING Dedong1,2, HE Jing1,2,*(), ZHAO Jitao1,2, LI Yanxiang1,2, ZHAO Qian1,2, ZHANG Chongqing1,2, LI Nan1,2   

  1. 1. College of Forestry, Gansu Agricultural University, Lanzhou 730070, China
    2. Gansu Lycium barbarum Harmless Cultivation Engineering Research Center, Lanzhou 730070, China
  • Received:2022-08-11 Online:2023-07-25 Published:2023-08-17
  • Contact: HE Jing

摘要:

为筛选对枸杞根腐病主要致病菌Fusarium solani具有明显抑制效果的生防菌株,通过组织分离法从健康枸杞植株中分离内生真菌,用平板对峙法筛选拮抗菌株,结合形态特征和分子生物学鉴定明确其分类地位;分别采用菌丝生长速率法和悬滴法比较不同培养液处理的内生真菌对F. solani菌丝生长和孢子萌发的影响,通过盆栽试验验证其生防效果。结果表明,在分离得到的106株内生真菌中,筛选获得1株对F. Solani具有明显抑制效果的拮抗菌株,编号YBG8,经鉴定其为链格孢菌(Alternaria alternata);YBG8原液体积分数为20%时,对F. solani菌丝生长抑制率最强,达70.49%,且具有浓度依赖性;YBG8滤液体积分数50%时,对F. solani孢子萌发抑制率最大,达82.4%;盆栽试验结果显示,先接种A. alternata再接种F. solani,可有效降低枸杞根腐病的发病率,其相对防效可达50%。研究结果可以为有效利用内生真菌防治枸杞根腐病提供理论依据。

关键词: 枸杞, 根腐病, 内生真菌, 拮抗菌株, 发病率

Abstract:

In order to screen antagonistic strains with significant inhibitory effects against Fusarium solani, the main pathogenic fungus of Lycium barbarum root rot, endophytic fungi were isolated from healthy L. barbarum plants using tissue separation method. Antagonistic strains were selected through plate confrontation method, and their taxonomic status was determined based on morphological features and molecular biology identification. The effects of endophytic fungi treated with different culture media on the mycelial growth and spore germination of F. solani were compared by mycelial growth rate method and droplet method, and their biocontrol effects were verified by pot experiments. The results showed that out of the 106 endophytic fungi isolated, one antagonistic strain YBG8 was selected, which had a significant inhibitory effect against F. solani, and was identified as Alternaria alternata. The inhibition rate of YBG8 against F. solani mycelial growth was the highest (70.49%) at a volume fraction of 20%, and showed concentration dependence. When YBG8 filtrate volume fraction was 50%, the inhibition rate against F. solani spore germination was the highest (82.4%). Pot experiments showed that pre-inoculation with A. alternata followed by F. solani could effectively reduce the incidence of L. barbarum root rot, achieving a relative preventive effect of up to 50%. These findings provided a theoretical basis for the effective use of endophytic fungi to control L. barbarum root rot.

Key words: Lycium barbarum, root rot, endophytic fungus, antagonistic strain, disease incidence

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