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林业科学 ›› 2020, Vol. 56 ›› Issue (7): 70-81.doi: 10.11707/j.1001-7488.20200708

所属专题: 森林有害生物

• 论文与研究报告 • 上一篇    下一篇

新疆野苹果内生娄彻氏链霉菌A-m1的鉴定和发酵条件优化及抑菌广谱作用

李永丽1,王亚红1,周洲1,*,曲良建2   

  1. 1. 河南科技大学林学院 洛阳 471023
    2. 中国林业科学研究院森林生态环境与森林保护研究所, 国家林业和草原局森林保护重点实验室 北京 100091
  • 收稿日期:2019-08-21 出版日期:2020-07-25 发布日期:2020-08-11
  • 通讯作者: 周洲
  • 基金资助:
    ‘十三五’国家重点研发计划课题(2016YFC0501503);国家自然科学基金项目(31600519);国家自然科学基金项目(31870638)

Identification and Optimization of Fermentation Conditions and Antibacterial Activity of Endophytic Streptomyces rochei A-m1 from the Branch of Malus sieversii

Yongli Li1,Yahong Wang1,Zhou Zhou1,*,Liangjian Qu2   

  1. 1. Henan University of Science and Technology Luoyang 471023
    2. Key Laboratory of Forest Protection, National Forestry and Grassland Administration Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry Beijing 100091
  • Received:2019-08-21 Online:2020-07-25 Published:2020-08-11
  • Contact: Zhou Zhou

摘要:

目的: 研究新疆野苹果内生链霉菌菌株A-m1的分类地位,优化其发酵条件,测定其对多种植物病原物的抑菌活性,明确其广谱抑菌性,为相关病害的生物防治以及该菌株的应用提供参考。方法: 对菌株A-m1菌落培养性状、形态特征、理化性质和16S rDNA序列进行研究;以葡萄座腔菌为靶标菌,确定最高抑菌活性所需的基础培养基,优化碳源和氮源种类,确定最优发酵条件;测定发酵滤液对9种供试植物病原菌的抑菌活性。结果: 菌株A-m1是娄彻氏链霉菌,命名为Streptomyces rochei A-m1。高抑菌活性所需基础培养基为高氏一号,最佳碳源为可溶性淀粉,最佳氮源为硝酸钾;添加培养基体积5%的种子液、发酵温度23~32℃之间、pH 6~8之间、装液量100/500 mL和发酵培养4天为较优的发酵条件。发酵滤液对参试的9株植物病原菌均表现出抑菌活性,具广谱抑菌性;其中对葡萄座腔菌、苹果拟茎点霉的抑菌率可达95%以上,对胶孢炭疽菌、小麦赤霉病菌和小麦纹枯病菌的抑菌率超过80%,表现出强抑菌作用。结论: 链霉菌S. rochei A-m1抑菌谱较广、抑菌活性高,具有防治部分作物真菌性病害的应用潜力。

关键词: 新疆野苹果, 娄彻氏链霉菌, 葡萄座腔菌, 内生菌, 抑菌谱广, 发酵条件

Abstract:

Objective: This paper aims to study the taxonomic status of endophytic actinomycete A-m1, optimize its fermentation conditions, and clarify its antibacterial activity and antibacterial spectrum against pathogens such as apple diseases, and provide biological control for related diseases and further application of the strain. Method: The colony culture characteristics, morphological observation, physicochemical properties and 16S rDNA sequence of strain A-m1 were studied. The basic medium for the highest antibacterial activity was determined by using Botryosphaeria dothidea as the target bacteria, and the types of carbon source and nitrogen sources were optimized. The optimal fermentation conditions were determined; the antibacterial activity of the fermentation filtrate against the nine tested pathogens was determined. Result: The strain A-m1 was identified as Streptomyces rochei by combining morphology, physiological and biochemical characteristics and 16S rDNA molecular identification. The basic medium required for high bacteriostatic activity was Gause 1 cultural medium, the best carbon source was soluble starch, the optimum nitrogen source was potassium nitrate. The optimal fermentation conditions were: adding 5% seed solution of medium volume, the fermentation temperature of 23-32 ℃, pH of 6-8, the liquid volume of 100/500 mL, and fermentation culture for 4 days. The fermentation filtrate showed antibacterial activity against the 9 plant pathogens tested, showing the broad-spectrum of antibacterial activity. Among them, the antibacterial activity of the fermentation filtrate against B.dothidea and Phomopsis mali was more than 95%, and the inhibition rate against Colletotrichum gloeosporioides, Fusarium graminearum and Rizoctonia cerealis was over 80%. Conclusions: S. rochei A-m1 has a broad spectrum of antibacterial activity and high antibacterial activity, and has the potential for controlling fungal diseases of some crops.

Key words: Malus sieversii, Streptomyces rochei, Botryosphaeria dothidea, endophyte, extensive inhibition spectrum, fermentation conditions

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