Guyoneaud R, Süling J, Petri R, Matheron R, Caumette P, Pfennig N, Imhoff J F
Laboratoire d'Océanographie Biologique, Université Bordeaux I, URA-CNRS 197, Arcachron, France.
Int J Syst Bacteriol. 1998 Jul;48 Pt 3:957-64. doi: 10.1099/00207713-48-3-957.
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.
测定了硫帽菌属（Thiocapsa）和变形杆菌属（Amoebobacter）物种的16S rDNA完整核苷酸序列，包括所有可用的模式菌株和一些其他分离株。用于估计遗传关系的距离矩阵分析和系统发育树显示，所研究的菌株分布在着色菌科（Chromatiaceae）的两个主要类群中。一个类群包括所有变形杆菌属物种、玫瑰色硫帽菌（Thiocapsa roseopersicina）以及一些与玫瑰色硫帽菌相关的分离株。玫瑰色变形杆菌（Amoebobacter roseus）、悬垂变形杆菌（Amoebobacter pendens）和玫瑰色硫帽菌的代表，即所谓的“玫瑰色硫帽菌群”，亲缘关系非常密切，因此将它们归入硫帽菌属是合理的，并给出了该属的修订描述。紫色变形杆菌（Amoebobacter purpureus）和足形变形杆菌（Amoebobacter pedioformis）形成了两个独立的谱系，与“玫瑰色硫帽菌群”的菌株相似度低于93%（89.6 - 92.9%）。因此，它们将被视为两个独立的属。结果，给出了变形杆菌属的修订描述，以紫色变形杆菌为新模式种，足形变形杆菌被转移至新属足形硫灯菌（Thiolamprovum pedioforme），新组合。由于形态学特征而被归类于硫帽菌属的两个物种，芬氏硫帽菌（Thiocapsa pfennigii）和嗜盐硫帽菌（Thiocapsa halophila），在着色菌科的另一个主要类群中被发现，并且与第一个类群的系统发育关系较远，序列相似度分别为88.4 - 90.6%和90.4 - 92.2%。
