斜茎黄芪根瘤菌结瘤基因nod A PCR扩增及PCR-RFLP分析
文献类型: 中文期刊
作者: 高俊莲;孙建光;陈文新
作者机构:
关键词: 斜茎黄芪;根瘤菌;nodA基因;多样性;PCR-RFLP
期刊名称:微生物学杂志
ISSN: 1005-7021
年卷期: 2006 年 26 卷 04 期
页码: 1-5
收录情况: CSCD
摘要: 对采自我国北方地区的16株斜茎黄芪根瘤菌代表菌株的共同结瘤基因nodA进行了PCR扩增及PCR-RFLP分析研究。来自Mesorhizobium和Rhizobium系统发育分支的代表菌株都得到了nodA PCR扩增产物;而来自Agrobacterium系统发育分支的代表菌株都没有得到nodA PCR扩增产物。进一步的nodAPCR-RFLP分析结果表明斜茎黄芪根瘤菌具有很大的nodA基因遗传多样性,具有4种不同的16S rDNAPCR-RFLP遗传图谱类型的12株斜茎黄芪根瘤菌具有8种不同的nodA PCR-RFLP遗传图谱类型。但是斜茎黄芪根瘤菌nodA基因遗传多样性随种群而变化,来自M.septentrionale的具有相同的16S rDNA PCR-RFLP遗传图谱类型的4个代表菌株具有4种不同的nodA PCR-RFLP遗传图谱类型;而来自M.tempera-tum的具有相同的16S rDNA PCR-RFLP遗传图谱类型3个代表菌株则具有相同的nodA PCR-RFLP遗传图谱类型。此外,来自不同种的具有不同16S rDNA PCR-RFLP遗传图谱类型的菌株却具有相同的nodA PCR-RFLP遗传图谱类型,说明nodA基因可能在根瘤菌的不同种间发生了水平转移。
分类号: S541.9
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