内蒙古锡林浩特地区嗜盐古菌多样性的研究

Diversity of Halophilic Archaea in Hypersaline lakes of Inner Mongolia,China

从内蒙古锡林浩特地区3个不同的盐湖中共分离到165株古菌，通过ARDRA分析后得到不同的类群，从各个类群中随机选取1—2个代表菌株进行16S rDNA序列测定和系统发育的分析。结果表明分离的菌株分布在Halorubrum，Natronococcus，Natronorubrum，Haloterrigena，Halorhabdus，Halobiforma，Haloarcula，Haloferax8个属和另外两个分支中，表现了锡林浩特地区嗜盐古菌的多样性。部分菌株的16S rDNA序列同源性低于97％，可能是潜在的新属或新种，代表了该地区嗜盐古菌的独特类型。

The aims of this work were to explore the diversity of halophilic archaea in hypersaline lakes of Inner Mongolia, China and to collect novel halophilic archaea. One hundred and sixty-five halophilic archaea were isolated from the three different types of hypersaline lakes （Ediannor, shangmatala analysis of the restriction patterns of amplified 16S rDNA （ARDRA） with and Xilin soda lake） in Inner Mongolia. By the enzyme Afa Ⅰ and Hae Ⅲ, respectively, the isolates were clustered into 14 genotypes, and the representatives of each genotype were randomly chosen for the determination of 16S rDNA sequence. The phylogenetic analysis revealed that all of the isolates were clustered into 10 groups： Halorubrum, Natronococcus, Natronorubrum, Haloterrigena, Halorhabdus, Halobiforma, Haloarcula, Haloferax and other two unknown groups. Dominant isolates were related to Halorubrum spp. in all three lakes. Some of the isolates studied showed less affilation with known taxa （ 〈 98% sequence similarity） and may represent novel taxa. Two isolates HXH33 and HSH33 showed very less affiliation with known genus （ 〈 93% sequence similarity） and may represent two new genera. These results suggest that diverse archaea exist in and the unknown archaea thrive in the hypersaline lakes of Inner Mongolia.