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现代分子生物学技术为蓝藻的生物多样性研究提供了更多信息和证据.单细胞蓝藻——双囊藻属（Geminocystis）是2009年从集胞藻（Synechocystis）分离出来的新属.2017年5月从青海湖的封闭子湖——月牙湖采集分离到一株单细胞蓝藻藻株，16S rRNA基因序列显示此藻株和双囊藻的藻种显示出最高的相似性，都在97%以上，并且在分子系统树聚为一束.此株的细胞结构以及超微结构显示，细胞纵轴具有窝式结构以及类囊体不规则的排列等双囊藻属所具有的特征.双囊藻是我国蓝藻的新报道纪录属，本研究还对双囊藻的分类和生态进行了讨论. 相似文献
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Species in the cyanobacterial genus Merismopedia are present in freshwaters at different trophic levels, with some species even as the components of cyanobacterial blooms. However, species diversity in this genus was not fully verified by molecular investigation and polyphasic taxonomic studies. In this study, Merismopedia-like strain tenuissima CHAB 7021 was isolated from Ganjiang River in Jiangxi Province, China, and polyphasic characterization of this strain was performed by morphological observation, ultrastructural examination, chemical detection of pigments and phylogenetic analysis based on 16 S rRNA gene sequences. Morphological identification of the strain was supported by the ultrastructural features, as the tiny species Merismopedia tenuissima Lemmermann. The phylogeny based on 16 S rRNA gene sequences revealed at least three clades formed by the strains of Merismopedia. The three M. tenuissima strains including M. tenuissima CHAB 7021 was gathered in clade III with distant relationship to the clade I formed by the six Merismopedia strains including the type species M. punctata, and such a genetic distance may propose Merismopedia tenuissima to separate from Merismopedia genus. However intermixture relationship in between strains of M. punctate and M. glauca in the phylogenetic tree still complicated the taxonomic status in the genus Merismopedia. The process for taxonomic revision in the Merismopedia genus still await for examination and further information on more strains of type species M. punctata. 相似文献
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