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蔬菜保护地木霉菌rDNA-ITS序列和UP-PCR遗传多样性分析

, PP. 459-465

Keywords: 木霉菌,ITS,通用引物PCR,遗传多样性

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Abstract:

采用传统形态学分类和ITS序列比对的方法,研究蔬菜保护地土壤中木霉菌种群分布和遗传多样性。木霉菌分离培养结果显示,共获得397株木霉菌,鉴定出11个种,分别为:长枝木霉Trichodermalongibrachiatum、深绿木霉T.atroviride、哈茨木霉T.harzianum、粘绿木霉T.viren、微孢木霉T.minutisporum、拟康木霉T.pseudokoningii、黄绿木霉T.aureoviride、非钩木霉T.inhamatum、棘孢木霉T.asperellum、长孢木霉T.longipile和螺旋木霉T.helicum。经ITS序列建立系统发育树后,将木霉菌分为5个组。用5条通用引物经UP-PCR扩增后,扩增出46条谱带,其中多态性条带43条,占总条带数的93.5%。遗传多样性分析表明,当相似系数为0.80时,可将24个菌株划分为9个组。UP-PCR与ITS序列相比,更能体现木霉菌种间和种内的亲缘关系及遗传差异性,可以作为木霉菌分类的辅助方法。

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