孙继文,黄健栋,吴文俊,邱佳期,李艳华,胡位荣,刘顺枝.红肉蜜柚内生菌的分离及抑菌活性分析[J].广东农业科学,2016,43(8):108-112 |
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红肉蜜柚内生菌的分离及抑菌活性分析 |
Isolation,identification and antimicrobial activity of endophytes from red-fleshed sweet pomelo |
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DOI:10.16768/j.issn.1004-874X.2016.08.018 |
中文关键词: 红肉蜜柚 内生菌 分离 抑菌活性 |
英文关键词: red-flesh sweet pomelo(Citrus grandis) endophyte isolation antimicrobial activity |
基金项目:广东省大学生创新训练项目(201411078033,201511078037);广东省科技计划项目(2015A020209190) |
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中文摘要: |
选取牛肉膏蛋白胨、马铃薯葡萄糖琼脂(PDA) 和高氏1 号3 种培养基,利用组织块法对红肉蜜柚(Citrus grandis)果实的内生菌进行分离纯化,得到9 株菌株,经生物学性状分析,9 株菌株均为放线菌,分属于诺卡氏菌属(Norcardia)和链霉菌属(Streptomyces)。采用平皿对峙法测定供试菌株的拮抗活性,有6 株表现出不同程度的拮抗作用,占全部分离菌株的66.7%,其中1 株对大肠杆菌(Escherichia coli)、4 株对金色葡萄球菌(Staphylococcus aureus)、3 株对枯草芽孢杆菌(Bacillus subtilis)具有明显的抑菌效果;在3 种柑橘病原菌的抑菌试验中,有7 株菌株表现出不同程度的拮抗作用,占全部分离菌株的77.8%,其中7 株对指状青霉(Penicillium digitatum Sacc.)、3 株对意大利青霉(Penicillium italicum Wehmer)、3 株对柑橘链格孢(Alternaria citri Ellis et. Pierce)的抑菌率超过75%。菌株P1、R2 对3 种柑橘病原菌均有很高的抑菌活性。 |
英文摘要: |
Nine endophytic strains were isolated from mature fruit of red-flesh sweet pomelo(Citrus grandis) by tissue explant isolation method on 3 sorts of culture mediums,including beef extract peptone medium,PDA media and Gause's No.1 medium. By morphologic and microscopical characteristics,the 9 strains were identified as endophytic actinomycetes,and were classified into 2 genera of Norcardia(4 strains) and Streptomyces( 5 strains).Antimicrobial activities of these actinomycetes were determined by confronting cultivation on PDA plate method. The results showed that 6 strains performed different degrees of antagonistic activity against Escherichia coli(1 strain),Staphylococcus aureus(4 strains) and Bacillus subtilis(3 strains) ,accounting for 66.7% of all strains. And 7 strains possessed significantly higher antifungal activity against Penicillium digitatum Sacc.(7 strain),P. italicum Wehmer(3 strains) and Alternaria citri Ellis et. Pierce(3 strains) ,accounting for 77.8% of all strains,with more than 75% inhibition rate. The strains of P1 and R2 exhibited stronger antagonistic activity against the 3 kinds of citrus pathogens. |
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