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首页> 外文期刊>Archives of microbiology >A gas vesiculate planktonic strain of the purple non-sulfur bacterium Rhodoferax antarcticus isolated from Lake Fryxell, Dry Valleys, Antarctica
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A gas vesiculate planktonic strain of the purple non-sulfur bacterium Rhodoferax antarcticus isolated from Lake Fryxell, Dry Valleys, Antarctica

机译：紫色非硫细菌南极Rhodoferax antarcticus的气泡浮游株，从南极干燥谷的Fryxell湖分离

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摘要

A moderately psychrophilic purple non-sulfur bacterium, Rhodoferax antarcticus strain Fryx1, is described. Strain Fryx1 was isolated from the water column under the ice of the permanently frozen Lake Fryxell, Antarctica. Cells of Fryx1 are long thin rods and contain gas vesicles, the first report of such structures in purple non-sulfur bacteria. Gas vesicles are clustered at 2-4 sites per cell. Surprisingly, the 16S rRNA gene sequence of strain Fryx1 is nearly identical to that of Rfx. antarcticus strain AB, a short, vibrio-shaped phototroph isolated from an Antarctic microbial mat. Although showing physiological parallels, strains AB and Fryx1 differ distinctly in their morphology and absorption spectra. DNA-DNA hybridization shows that the genomes of strains AB and Fryx1 are highly related, yet distinct. We conclude that although strains AB and Fryx1 may indeed be the same species, their ecologies are quite different. Unlike strain AB, strain Fryx1 has adapted to a planktonic existence in the nearly freezing water column of Lake Fryxell.
机译：描述了一种中等嗜冷性紫色非硫细菌南极Rhodoferax Antarcticus菌株Fryx1。从南极永久冻结的弗莱克塞尔湖冰面下的水柱中分离出菌株Fryx1。 Fryx1的细胞是细长的细棒，并包含气体囊泡，这是紫色非硫细菌中此类结构的首次报道。气泡聚集在每个细胞2-4个位置。令人惊讶的是，菌株Fryx1的16S rRNA基因序列与Rfx几乎相同。南极菌株AB，一种从南极微生物垫中分离出来的短的弧菌状光养菌。尽管显示出生理上的相似性，但菌株AB和Fryx1的形态和吸收光谱存在明显差异。 DNA-DNA杂交表明，菌株AB和Fryx1的基因组高度相关，但截然不同。我们得出的结论是，尽管AB和Fryx1菌株确实确实是同一物种，但它们的生态学却大不相同。与AB菌株不同，Fryx1菌株适应了Fryxell湖几乎结冰的水柱中的浮游生物。

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