Spore-forming halophilic bacteria isolated from Arctic terrains: Implications for long-range transportation of microorganisms
Spore-forming halophilic bacteria isolated from Arctic terrains: Implications for long-range transportation of microorganisms
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DOI：
10.1016/j.polar.2009.07.002
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发表时间：
2009-11
期刊：
影响因子：
1.8
通讯作者：
K. Yukimura;R. Nakai;S. Kohshima;J. Uetake;H. Kanda;T. Naganuma
中科院分区：
文献类型：
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作者：
K. Yukimura;R. Nakai;S. Kohshima;J. Uetake;H. Kanda;T. Naganuma
生活在格陵兰岛等北极地区的生物必须适应低温条件。细菌抵抗低温的机制在很大程度上是未知的；然而，居住在北极的微生物的一个众所周知的生存策略是形成孢子。此外，嗜盐细菌通常对各种胁迫都有抵抗力。我们已经尝试从北极地区分离出形成孢子的嗜盐细菌。2007年7月，我们从格陵兰岛QAANAAQ冰川冰川上采集的样本中分离出10株形成芽胞的嗜盐细菌。基于16S rRNA基因序列相似性的鉴定表明，这些菌株与海洋杆菌属、鸟杆菌属、维吉杆菌属、格雷氏杆菌属和芽孢杆菌属的亲缘关系较近。此外，一些分离物的16S rRNA序列与来自中国沙漠沙地的菌株极其相似(100%同源性，接近全长)，也就是所谓的黄尘的来源。此前的研究表明，黄色沙尘是被风吹到格陵兰岛的。我们的研究表明，这些微生物可以远距离运输到北极等地。
Organisms living in the Arctic terrains such as Greenland have to deal with low temperature conditions. The mechanisms by which bacteria resist to low temperature are largely unknown; however, a well-known survival strategy of the microorganisms inhabiting the Arctic is spore forming. Moreover, halophilic bacteria are often resistant to various stresses. We have attempted isolation of spore-forming halophilic bacteria from Arctic terrains. We isolated 10 strains of spore-forming halophilic bacteria from the samples collected from a glacial moraine in Qaanaaq, Greenland in July 2007. Identification based on 16S rRNA gene sequence similarities showed that the isolates were closely related to the Oceanobacillus, Ornithinibacillus, Virgibacillus, Gracilibacillus, and Bacillus genera. In addition, the 16S rRNA sequences of some isolates were extremely similar to those of strains from the desert sand in China (100% identity, near full length), the source of the so-called “yellow dust.” Previous research indicated that yellow dust had been transported to Greenland by the wind. Our research implies the long-range transportation of these microorganisms to locations such as the Arctic.