目的:对具有抗氧化活性的北五味子内生真菌进行筛选及鉴定.方法:利用组织分离法,从野生北五味子的根、茎、叶及果实中分离内生真菌,分别采用1,1-二苯基-2-三硝基苯肼(DPPH)自由基清除法及羟自由基清除法筛选具有抗氧化活性的内生真菌;并对菌株的总DNA进行提取,利用通用引物ITS1和ITS4对菌株18S rDNA ITS序列进行扩增和测序,将测序结果进行同源性比对分析,确定活性菌株的分类地位.结果:从北五味子中共分离得到23株内生真菌.其中,从根部分离出的编号为GSR-12的菌株表现出较强的抗氧化活性,其DPPH自由基清除率和羟自由基清除率分别为87.96%和82.31%;经比对分析后鉴定GSR-12为粉红粘帚霉(Clonostachys rosea).结论:分离自野生北五味子根部的1株粉红粘帚霉具有较强的抗氧化活性.%OBJECTIVE:To screen and identify endophytic fungi from Schisandra chinensis with antioxidant activity. METH-ODS:The tissue isolation skill was used to isolate endophytic fungi from roots,leaves,stems and fruits of S. chinensis. And anti-oxidant activity of endophytic fungi were screened by DPPH radical scavenging assay and hydroxyl radical scavenging assay. The to-tal DNA were extracted;the 18S rDNA ITS were amplified and sequenced with primer ITS1 and ITS4;the results of sequencing were analyzed comparatively based on homology to confirm the classification of active strains. RESULTS:23 strains were isolated from S. chinensis. GSR-12,isolated from roots of S. chinensis,had strong antioxidant activities. The scavenging rate on DPPH and the hydroxyl radical were 87.96% and 82.31% respectively. GSR-12 strain was identified as Clonostachys rosea by analyzed com-paratively. CONCLUSIONS:1 strain of C. rosea,isolated from roots of S. chinensis,has strong antioxidant activity.
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