生物技术通报 ›› 2019, Vol. 35 ›› Issue (8): 9-16.doi: 10.13560/j.cnki.biotech.bull.1985.2019-0084

• 研究报告 • 上一篇    下一篇

马铃薯黑痣病菌拮抗菌的筛选鉴定及生防因子分析

宋本超, 赵冬梅, 杨志辉, 张岱, 赵志, 朱杰华   

  1. 河北农业大学植物保护学院,保定 071001
  • 收稿日期:2019-01-23 出版日期:2019-08-26 发布日期:2019-08-05
  • 作者简介:宋本超,男,硕士研究生,研究方向:植物病理学;E-mail:benchaobl@163.com
  • 基金资助:
    国家重点研发计划(2018YFD0200806),现代农业产业技术体系建设专项资金(CARS-09-P18),河北省薯类产业技术体系创新团队专项基金(HBCT2018080205)

Screening and Identification of an Antagonistic Bacterium Against Rhizoctonia solani and Analysis of Biocontrol Factor

SONG Ben-chao, ZHAO Dong-mei, YANG Zhi-hui, ZHANG Dai, ZHAO Zhi, ZHU Jie-hua   

  1. College of Plant protection,Agricultural University of Hebei,Baoding 071001
  • Received:2019-01-23 Published:2019-08-26 Online:2019-08-05

摘要: 应用平板对峙法从马铃薯根际土中筛选得到9株对马铃薯黑痣病抑菌效果较好的生防菌。采用形态学、生理生化特征及16S rDNA(Gen-bank MK271286)和gyrB(Gen-bank MK295695)序列分析对其中抑菌效果最好的菌株Z17-2鉴定为解淀粉芽胞杆菌Bacillus amyloliquefaciens。测定其抑菌谱的结果证明其对黑痣病菌、早疫病菌、枯萎病菌、干腐病菌、疮痂病菌有抑制作用,对黑胫病菌无抑制作用。通过测定其产脂肽、蛋白酶、纤维素酶、果胶酶、淀粉酶、铁载体及解磷解钾能力,确定菌株Z17-2含有sfp、fenB、bacD、mycB等脂肽合成基因,能够产生蛋白酶、铁载体、纤维素酶,不能产生果胶酶,不具有解磷解钾能力。通过带毒培养基确定脂肽粗提物的抑菌能力达到70.38%。

关键词: 立枯丝核菌, 解淀粉芽胞杆菌, 脂肽类物质, 生物防治

Abstract: In order to screen the biocontrol bacteria against Rhizoctonia solani,plate confrontation method was used to screen 9 strains of bacteria with better bacteriostatic effect from potato rhizosphere soil. The strain Z17-2 with the best antibacterial activity was identified as Bacillus amyloliquefaciens based on morphological,physiological and biochemical characteristics and phylogenetic analysis of 16S rDNA(GenBank accession number:MK271286)and gyrB(GenBank accession number:MK295695)sequences. Strain Z17-2 demonstrated antibacterial activity against Rhizoctonia solani,Alternaria solani,Fusarium oxysporum,Fusarium sambucinum,and Streptomyces scabie,while no inhibitory effect on Erwinia carotovora. By measuring the ability of producing lipopeptide,protease,cellulase,pectinase,amylase,iron carrier and phosphorus- and potassium-solubilizing,it was confirmed that strain Z17-2 contained lipopeptide-synthesized gene sfp,fenB,bacD and mycB,and produced protease,iron carrier,cellulase,while no pectinase,and presented no ability of dissolving phosphorus and potassium. The antibacterial ability of the lipopeptide extract in the toxic medium was determined to be 70.38%.

Key words: Rhizoctonia solani, Bacillus amyloliquefaciens, lipopeptide, biocontrol