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中国生物防治学报 ›› 2020, Vol. 36 ›› Issue (2): 220-230.DOI: 10.16409/j.cnki.2095-039x.2020.02.007

• 研究论文 • 上一篇    下一篇

贝莱斯芽胞杆菌HN-2的鉴定及对杧果炭疽菌的抑菌活性研究

王雨, 谭峥, 韦丹丹, 缪卫国, 刘文波, 靳鹏飞   

  1. 海南大学植物保护学院/热带农林生物灾害绿色防控教育部重点实验室, 海口 570228
  • 收稿日期:2020-01-22 出版日期:2020-04-08 发布日期:2020-04-16
  • 通讯作者: 靳鹏飞,博士,讲师,E-mail:jiepengfei@hainu.edu.cn
  • 作者简介:王雨,硕士研究生,E-mail:15383468897@163.com
  • 基金资助:
    国家自然科学基金(31960552);海南省青年科技英才创新计划(QCXM201903);海南大学校内科研启动经费(KYQD (ZR)1842);海南自然科学基金(2016CXTD002);国家重点研发计划(2018YFD0201105);海南省重点研发计划(ZDYF2016208,ZDYF2018240)

Identification of Bacillus HN-2 and Analysis of Its Antifungal Properties

WANG Yu, TAN Zheng, WEI Dandan, MIAO Weiguo, LIU Wenbo, JIN Pengfei   

  1. Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests, Ministry of Education/College of Plant Protection, Hainan University, Haikou 570228, China
  • Received:2020-01-22 Online:2020-04-08 Published:2020-04-16

摘要: 菌株HN-2为本实验室分离得到的一株生防细菌,通过采用形态学观察结合现代分子生物学的手段鉴定生防菌HN-2为贝莱斯芽胞杆菌Bacillus velezensis,以杧果炭疽菌Colletotrichum gloeosporioides Penz作为靶标,其发酵上清液的正丁醇萃取粗提物的活性最好,抑菌圈大小为20.93 mm,半最大效应浓度(EC50)为70.62 μg/mL。通过飞行时间质谱(MALDI-TOF-MS)数据结合基因检测的结果分析发现,正丁醇提取物中主要活性成分为脂肽类物质,其中含有表面活性素(surfactin)、伊枯草菌素(iturins)和泛革素(fengycin)等。通过显微观察发现正丁醇粗提物可以造成杧果炭疽病菌菌丝扭曲、膨大、畸形,从而抑制杧果炭疽病菌的生长,菌株HN-2正丁醇提取物处理后的杧果15 d内未出现杧果炭疽病病状,对杧果果实具有较好的保护作用。贝莱斯芽胞杆菌HN-2的主要活性物质为脂肽类物质,其对植物病原真菌有较好的防治效果,具有进一步深入研究和开发应用的潜力。

关键词: 贝莱斯芽胞杆菌, 脂肽类化合物, 抑菌活性, 杧果炭疽菌, EC50

Abstract: The strain HN-2 was isolated from soil. Through morphological, physiological and biochemical characteristics identification, phylogenet tree analysis of 16S rDNA sequence and specific PCR detection, the strain was identified to be Bacillus velezensis. The n-butanol extract, ammonium sulfate precipitation extract and acidification extract of B. velezensis HN-2 demonstrated strong antifungal activity against C. gloeosporioides, with the diameters of inhibition zone of 20.93±0.3 mm, 12.82±0.3mm and 13.57±0.3 mm, respectively. The EC50 value of n-butanol extract was 70.62 μg/mL. Mass spectrum analysis showed that lipopeptide was the main active substance of the strain HN-2, consisting of surfactin, fengycin and iturin. The mycelia of C. gloeosporioides treated with n-butanol extract were distorted, swollen and deformed. Application of n-butanol can reduce the development of C. gloeosporioides on the punctured epidermis of mango. It could be concluded that B. velezensis HN-2 had strong antifungal activity and the main antifungal substance was lipopeptide.

Key words: Bacillus velezensis, lipopeptide, antifungal activity, Colletotrichum gloeosporioides, EC50

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