Taxonomic rearrangements of the genera Thiocapsa and Amoebobacter on the basis of 16S rDNA sequence analyses, and description of Thiolamprovum gen. nov.
Taxonomic rearrangements of the genera Thiocapsa and Amoebobacter on the basis of 16S rDNA sequence analyses, and description of Thiolamprovum gen. nov.
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DOI：
10.1099/00207713-48-3-957
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发表时间：
1998-07-01
期刊：
影响因子：
--
通讯作者：
Imhoff, JF
中科院分区：
文献类型：
--
作者：
Guyoneaud, R;Süling, J;Imhoff, JF
测定了硫杆菌和变形杆菌的16S rDNA全序列，包括所有可利用的模式菌株和一些额外的分离株。距离矩阵分析和亲缘关系树分析表明，所调查的菌株分布在色素科的两大类群中。其中一个群包括所有的变形杆菌种，玫瑰硫杆菌和几个与玫瑰硫杆菌相关的菌株。玫瑰变形杆菌、悬垂变形杆菌和玫瑰硫杆菌的代表种，也就是所谓的玫瑰硫杆菌群，亲缘关系非常密切，证明它们属于一个属--硫杆菌属，并对其进行了订正描述。紫色阿米巴和儿形阿米巴形成两个独立的谱系，与‘玫瑰硫杆菌属’的同源性低于93%(89.6-92.9%)。因此，它们将被视为两个独立的属。在此基础上，对阿米巴杆菌属进行了订正，其中紫色阿米巴杆菌为新模式种，小形阿米巴杆菌被转移到小球硫杆菌属。11月，Comb.11月两个种，Pfennigii硫囊藻属和盐生硫囊藻属，因其形态特征而被归入Thiocapsa属，它们分别与色素科的另一大类群有较远的亲缘关系，分别有88.4-90.6%和90.4-92.2%的序列相似性。
Complete nucleotide sequences of the 16S rDNAs were determined from Thiocapsa and Amoebobacter species, including all available type strains and some additional isolates. The distance-matrix analysis and the dendrogram for estimating the genetic relationships revealed that the investigated strains were found in two major clusters within the Chromatiaceae. One cluster comprises all Amoebobacter species, Thiocapsa roseopersicina and several isolates related to Thiocapsa roseopersicina. Representatives of the species Amoebobacter roseus, Amoebobacter pendens and Thiocapsa roseopersicina, the so called 'Thiocapsa roseopersicina group', are very closely related, justifying their inclusion into one genus, Thiocapsa, for which an emended description is presented. Amoebobacter purpureus and Amoebobacter pedioformis formed two separate lines of descent with less than 93% (89.6-92.9%) similarity to strains of the 'Thiocapsa roseopersicina group'. Therefore, they will be considered as two separate genera. As a consequence, an emended description is presented for the genus Amoebobacter, with Amoebobacter purpureus as the new type species and A. pedioformis is transferred to Thiolamprovum pedioforme gen. nov., comb. nov. Two species, Thiocapsa pfennigii and Thiocapsa halophila, which have been classified with the genus Thiocapsa because of their morphological properties, were found within another major cluster of the Chromatiaceae and are only distantly phylogenetically related to the first cluster with 88.4-90.6 % and 90.4-92.2 % sequence similarity, respectively.