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天麻内生真菌的分离鉴定及药物化学的初步研究
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摘要
目前,关于药用植物资源保护的研究中,药用植物的内生真菌已经成为药用植物资源研究的一个新热点。由于内生真菌的次级代谢产物中含有与药用植物相同或相似的生物活性物质,所以研究药用植物内生真菌多样性,利用内生真菌发酵生产药物具有相当的优势。
     本文首先对内生真菌的国内外研究概况及其研究意义进行了综述。从内生真菌的分布、生物多样性、代谢物质的多样性到内生真菌的生物学作用做了介绍,并且对天麻及应用价值做了简单概述。
     本文以我国传统中药——天麻(Gastrodia elata B1)为实验材料,对天麻内生真菌的菌群组成及活性成分进行初步研究。取得以下结果:
     1、内生真菌的分离鉴定:采用组织印迹培养法,对产自贵州、四川、陕西、云南等地天麻的不同组织进行内生真菌的分离,并确定如何区分组织内生真菌与表面附生菌的方法。实验结果表明,天麻内生真菌分离的表面消毒以75%酒精和0.1%升汞结合的方法较好。在所试条件下共计分离得到94株内生真菌。对其中分离纯化的64株真菌,经形态学与分子生物学鉴定结果结合鉴定,分属于4个亚门、6纲、8目、11科、15属。鉴定结果在一定程度上反应了天麻内生真菌的生物多样性。采集于不同地区的天麻中均分离到了一定数量、不同类群的内生真菌,表明内生真菌在天麻体内广泛存在。
     天麻不同组织部位内生真菌的种类存在着一定的差异。块茎中鉴定的43株真菌分布于12个属(占27.9%),花茎中鉴定的10株菌分布于5个属(占50%),花中鉴定的7株菌分布于4个属(57.1%),果实中鉴定的4株菌分布于3个属(75%)。
     本试验还对同一季节不同地点来源的天麻块茎内生真菌进行了研究,其数量和种类存在着差异。数量上贵州大方的优势菌群为刺盘孢属(Colletotrichum sp.),占总数的16%;贵州毕节和四川广元的优势菌群是链格孢属(Alternaria sp.),分别是4株和5株,占总数的16%和20%。种类上,四川广元的内生真菌种类所占比例最高,共鉴定9株分布于5个属,占55.6%。
     2、产天麻素内生真菌的筛选:本文采用薄层层析TLC方法与高效液相色谱HPLC结合,从3株内生真菌DF101 (Chaetomium sp.)、BY302 (Fusarium sp.)、SC108 (Armillaria sp.)的发酵产物中检出天麻素,DF101为0.057mg/g, BY302为0.089mg/g, SC108为0.184 mg/g;对照品天麻中天麻素含量为1.038 mg/g,约为最高含量SC108的6倍。这3株内生真菌有2株来自块茎,1株来自花茎。
At present, for the protection of medicinal plant resources, the endophytic fungi of medicinal plant has become a new hot spot for research.Reasearch results in recent years show that endophytic fungi can produce some similar physiological active products to the host plant. So studies on endophytic fungi diversity of the medicinal plants and potential bioactive compounds from endophytic fungi has become important.
     In this thesis, studies on endophytic fungi in China and oversea were summarized. Gastrodia elata Bl, a chinese medicinal plant, was selected for the study. The content of the study includes distribution, diversity and function of endophytic fungi in G elata Bl, and ecological characteristics and worthness in application of G elata Bl. The distribution of endophytic fungi in G elata B1 tissues and isolation method were studied.
     The results obtained were as following:
     1 Isolation and identification of endophytic fungi:A method named tissue print culture was used to isolate endophytic fungi in G. elata B1 from Guizhou, Sichuan, Shanxi, Yunnan. The result indicated that, the superficial disinfection for endophytic fungi isolation was better with the method of 75% ethanol combined with 0.1% HgCl2. A total of 94 endophytic fungi islates were isolated, of which 64 islates were identified with morphology and the molecular biology. They belong to 15 genera,11 families,8orders,6 class and 4 phylum which showed the biodiversity of endophytic fungi in G elata Bl. Endophytic fungi were isolated from G. elata B1 from all different origins which demonstrated the widespread existence of endophytic fungi in G elata Bl.
     The population differences of endophytic fungi exist in different tissues or positions of G. elata Bl. In the tubers, scapes, flowers and fruits 43 fungal isolates of 12 genera (27.9%),10 isolates of 5 genera (50%),7 isolates of 4 genera (57.1%) and 4 isolates of 3 genera (75%) were isolated and identified respectively.
     In the research the endophytic fungi of G elata B1 from different origins at the same season were also studied. The dominant groups of Guizhou DaFang, Guizhou BiJie and Sichuan were Colletotrichum and Alternaria.
     2 Gastrodin production of the endophytic fungi :Thin layer chromatography(TLC) method and highly effective liquid chromatography(HPLC) were employed to detect metabolites of DF101 (Chaetomium sp.), BY302 (Fusarium sp.), SC108 (Armillaria sp.). The results indicated that the mycelia of these 3 isolates contained gastrodin and similar compounds. The gastrodin contents of DF101, BY302 and SC108 were 0.057mg/g,0.089mg/g and 0.184 mg/g respectively.
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