中国蓝藻新记录科——束鞘丝藻科(Coleofasciculaceae,Oscillatoriales)

TAXONOMIC NOTES ON COLEOFASCICULACEAE(OSCILLATORIALES,CYANOBACTERIA),A NEWLY RECORDED CYANOBACTERIA FAMILY IN CHINA

束鞘丝藻科(Coleofasciculaceae)是Komárek等于2014年从微鞘藻类群中(Microcoleus-like)分离出来而成立的新科。最近在一项关于中国丝状蓝藻的分类学研究过程中,从中国浙江省采集的藻席样品中成功分离到4株丝状蓝藻,这些藻株在形态学上与束鞘丝藻科的物种相似,基于16S rRNA和16S—23S rRNA序列中间ITS序列的二级结构等分子特征和系统发育分析表明,这些藻株与束鞘丝藻科的厚顶丝藻属(Pycnacronema)和威氏藻属(Wilmottia)分别能形成支持度良好的进化分支。结合分子、形态学和生态学数据以多相分析方法对藻株进行了系统化的研究和分类学界定。束鞘丝藻科在中国属于首次报道的蓝藻类群,同时这两属也是我国首次报道的新记录属。文章还结合了束鞘丝藻科的成立历史对现代蓝藻分类系统的重建过程,结果及发展趋势等新知识进行了介绍和讨论。

Along the rapid development of molecular biology technology,the cyanobacterial taxonomy is also experiencing great development and improvement,and many novel cyanobacterial taxa from different ecosystems were described.Coleofecosciculaceae is a new family established by Komárek et al.in 2014,which was separated from the Microcolleus-like group.However,the taxonomic studies and basic knowledge of this family are not involved in China.In this study,four filamentous cyanobacteria were successfully isolated from the microbial mats samples collected in Zhejiang Province,China.These strains were morphologically similar to the species of the family Coleofasciculaceae.The molecular characteristics and phylogenetic analysis based on 16S rRNA gene and 16S—23S ITS secondary structure showed that these strains formed well-supported phylogenetic evolutionary clades with Pycnacronema and Wilmottia,respectively.We used a method combination of all evidence composed of molecular characters,morphological,and ecophysiological data for taxa delimitation of Pycnacronema and Wilmottia.The family Coleofasciculaceae was firstly recorded here in China,and Pycnacronema and Wilmottia,were also the new recorded genera in China.In this paper,the result not only describes the history of the family Coleofasciculaceae but also introduces and discusses the modern cyanobacterial taxonomic system including its on-going process,current results and development trend.These positive results can greatly advance the progress of cyanobacterial taxonomy and increase the abundance of cyanobacterial species in China.