湖北贝母活性成分与内生菌次级代谢产物研究
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湖北省重点研发计划项目(2020BCA059);湖北省现代农业产业技术体系(HBHZD-ZB-2020005);湖北省农业科学院中药材研究所 2019 年青年基金项目(2019ZYCJJ05)


Active components of Fritillaria hupehensis and secondary metabolites of its endophytes
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    摘要:

    为探究湖北贝母不同组织贝母素乙含量、内生菌组成及其次级代谢产物的抑菌活性,采用气相色谱法测定湖北贝母鳞茎、花、叶的贝母素乙含量,分别利用16S rDNA和ITS测序技术鉴定内生细菌和真菌,并通过琼脂扩散法、微量二倍稀释法研究内生菌次级代谢产物对10株供试菌的抑菌活性。结果表明:湖北贝母叶中贝母素乙含量最高,达(3.99±0.10) mg/g,其含量是鳞茎的1.78倍、花的4.24倍;从湖北贝母中分离鉴定了4株内生菌,分别为Pseudomonassp. BM-X-6、Arthrinium sp. BM-Z-5、Aspergillus sp. BM-Z-1、Aspergillus sp. BM-Z-3;3株内生真菌次级代谢产物抑菌活性均优于细菌Pseudomonas sp. BM-X-6,其中Arthrinium sp. BM-Z-5的次级代谢产物抑菌谱最广,对肺炎克雷伯菌、金黄色葡萄球菌、藤黄微球菌、鲍曼不动杆菌、耐甲氧西林金黄色葡萄球菌有中度抑制活性。

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    Endophytes induced the biosynthesis or accumulation of the active components of the host medicinal plants,making the production and distribution of these active components different in species,organs,tissues and growth stages. F. hupehensis was a geo-authentic crude drug in Enshi area with a long medicinal history. Peiminine B was the main active component in F. hupehensis,with its functions of anti-colonic cancer,relieving myocarditis,alleviating lung injury and etc.We use gas chromatography (GC) to determine the content of peiminine B in bulbs,flowers and leaves of F. hupehensis to explore the content of peiminine B,the composition of endophytes and the antibacterial activity of its secondary metabolites in different tissues of F. hupehensis. The 16S rDNA and ITS sequencing were used to identify the species of endophytic bacteria or fungi,respectively. The agar diffusion method and double dilution method were used to study the antibacterial activity of secondary metabolites of endophytes against 10 strains of bacteria tested. The results showed that the content of peiminine B in leaves of F. hupehensis was the highest with (3.99±0.10) mg/g,which was 1.78 and 4.24 times as much as that in bulb and flower,respectively. Four strains of endophytes were isolated from F. hupehensis,identified as Pseudomonassp. BM-X-6,Arthriniumsp. BM-Z-5,Aspergillus sp. BM-Z-1 and Aspergillus sp. BM-Z-3. The secondary metabolites of three endophytic fungi had stronger antibacterial activity than Pseudomonas sp.BM-X-6. Meanwhile Arthriniumsp. BM-Z-5 had the broadest antibacterial spectrum,which showed moderate antibacterial activities against Klebsiella pneumoniae,Staphylococcus aureus,Micrococcus luteus,Acinetobacter baumannii and methicillinresistant Staphylococcus aureus(MRSA). It will provide a reference for expanding the medicinal parts and effectively saving resources of F. hupehensis and will provide a novel way to alleviate bacterial resistance and develop new antibacterial drugs.

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袁名远,李宇,谭旭辉,刘玉,方昕悦,冉亚兰,何美军.湖北贝母活性成分与内生菌次级代谢产物研究[J].华中农业大学学报,2021,40(6):27-34

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  • 在线发布日期: 2021-11-30
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