| 论文摘要： |
A coccoid cyanobacterial strain FACHB-3576 was isolated from Lake Hamatai, an alkaline-saline lake located near the Ordos Spirulina Industrial Park, Ordos, Inner Mongolia, China. This strain exhibited morphological similarities to the genus Cyanobacterium. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain FACHB-3576 formed a unique clade, distinctly separate from the other genera within the family Geminocystaceae. The genetic identity of 16S rRNA sequence between our strain and all other currently described genera in Geminocystaceae, including Cyanobacterium, was less than 95%. Moreover, this strain was further differentiated by its morphology and ecological characteristics. The strain is herein classified as a new cyanobacterial taxon Limnothece alkaliphila gen. et sp. nov. based on a polyphasic approach including data on morphology, ultrastructure, ecology, 16S rRNA phylogeny and secondary structure of the 16S-23S ITS region. The description of this novel taxon contributes to a better understanding of the diversity of coccoid cyanobacteria in alkaline-saline habitats. |
