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Diversity and origin of Desulfovibrio species: phylogenetic definition of a family.

机译:脱硫弧菌物种的多样性和起源:一个家庭的系统发育定义。

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摘要

The different nutritional properties of several Desulfovibrio desulfuricans strains suggest that either the strains are misclassified or there is a high degree of phenotypic diversity within the genus Desulfovibrio. The results of partial 16S rRNA and 23S rRNA sequence determinations demonstrated that Desulfovibrio desulfuricans ATCC 27774 and "Desulfovibrio multispirans" are closely related to the type strain (strain Essex 6) and that strains ATCC 7757, Norway 4, and El Agheila Z are not. Therefore, these latter three strains of Desulfovibrio desulfuricans are apparently misclassified. A comparative analysis of nearly complete 16S rRNA sequences in which we used a least-squares analysis method for evolutionary distances, an unweighted pair group method, a signature analysis method, and maximum parsimony was undertaken to further investigate the phylogeny of Desulfovibrio species. The species analyzed were resolved into two branches with origins deep within the delta subdivision of the purple photosynthetic bacteria. One branch contained five deep lineages, which were represented by (i) Desulfovibrio salexigens and Desulfovibrio desulfuricans El Agheila Z; (ii) Desulfovibrio africanus; (iii) Desulfovibrio desulfuricans ATCC 27774, Desulfomonas pigra, and Desulfovibrio vulgaris; (iv) Desulfovibrio gigas; and (v) Desulfomicrobium baculatus (Desulfovibrio baculatus) and Desulfovibrio desulfuricans Norway 4. A correlation between 16S rRNA sequence similarity and percentage of DNA relatedness showed that these five deep lineages are related at levels below the minimum genus level suggested by Johnson (in Bergey's Manual of Systematic Bacteriology, vol. 1, 1984). We propose that this branch should be grouped into a single family, the Desulfovibrionaceae. The other branch includes other genera of sulfate-reducing bacteria (e.g., Desulfobacter and Desulfococcus) and contains Desulfovibrio sapovorans and Desulfovibrio baarsii as separate, distantly related lineages.
机译:几种脱硫弧菌脱硫尿酸菌株的不同营养特性表明,该菌株被错误分类或在脱硫弧菌属内存在高度的表型多样性。部分16S rRNA和23S rRNA序列测定结果表明,脱硫脱硫弧菌ATCC 27774和“多脱硫弧菌”与类型菌株(菌株Essex 6)密切相关,而菌株ATCC 7757,Norway 4和El Agheila Z则不相关。因此,后三株脱硫弧菌脱硫尿素显然是错误分类的。我们对近乎完整的16S rRNA序列进行了比较分析,其中我们使用了最小二乘分析法确定了进化距离,采用了非加权对群法,特征分析法和最大简约法,以进一步研究脱硫弧菌的系统发育。分析的物种分为两个分支,其起源深处于紫色光合细菌的δ细分内。一个分支包含五个深层谱系,分别由(i)Desulfovibrio salexigens和Desulfovibrio desulfuricans El Agheila Z代表; (ii)非洲脱硫弧菌; (iii)脱硫脱硫弧菌ATCC 27774,猪脱硫单胞菌和寻常脱硫弧菌; iv脱硫弧菌; (v)脱硫微球菌(Desulfovibrio baculatus)和Desulfovibrio desulfuricans Norway4。16S rRNA序列相似性与DNA相似性百分比之间的相关性表明,这五个深谱系的相关性低于Johnson(在Bergey的手册中)建议的最低属水平。 (《系统细菌学》,第1卷,1984年)。我们建议将这个分支归为一个独立的家族,即脱硫弧菌科。另一个分支包括硫酸盐还原细菌的其他属(例如,Desulfobacter和Desulfococcus),并包含人乳Desulfovibrio sapovorans和Desulfovibrio baarsii作为独立的,远缘相关的谱系。

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