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《Chinese Journal of Applied Ecology》 2004-02
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Diversity of Frankia in nodules of Alnus nepalensis at Gaoligong mountains revealed by IGS PCR-RFLP analysis

DAI Yumei, CAO Jun, TANG Xiaomeng, ZHANG Chenggang(Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016,China)  
nodule samples were used to assess the diversity of Frankia strains symbiotically associated with Alnus nepalensis naturally occurring at the Gaoligong Mountains in Yunnan Province, China. DNA was extracted directly from nodules, and its two target DNA regions that encode nifD-nifK intergenic spacer (IGS) and 16S-23S rDNA IGS was studied by PCR-RFLP. The PCR fragments yielded by the nifD-nifK IGS were noticeably different in size, and when they were digested by HaeⅢ and AfaⅠ, 15 nif-type Frankia strains could be detected, the PCR-RFLP result of this region also could show that more than one genotype Frankia strains could form symbiosis with individual plants at the same time.The 16S-23S rDNA IGS had similar PCR fragments, but still identified 15 rrn-type strains after digested by HaeⅢ and AfaⅠ. 20 genotype strains could be found only when combined the PCR-RFLPs of two target regions.
【Fund】: 国家重点基础研究发展规划资助项目 ( 0 0 1CB10 89)
【CateGory Index】: S792
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【Co-references】
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