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异角毛藻和平滑角毛藻的分类学修订
许晓静, 李扬
华南师范大学生命科学学院, 广州市亚热带生物多样性与环境生物监测重点实验室, 广东省水产健康安全养殖重点实验室, 广州 510631
摘要:
为了澄清异角毛藻和平滑角毛藻的分类学疑问,在广东南澳岛海域建立了单克隆培养株系,利用光学显微镜和电子显微镜技术,开展了基于生活史的连续形态学观察,发现粗大角毛的延伸方向易变,是不稳定特征,不宜继续赋予分类学价值。对核糖体大亚基编码基因的D1~D3区序列进行扩增和分析,结果异角毛藻和平滑角毛藻的目标基因序列基本一致,仅有1个平滑角毛藻株系存在2个差异碱基。因此,两者具有一致的系统学位置,属于同一物种,平滑角毛藻应该是异角毛藻的同种异名。
关键词:  异角毛藻  平滑角毛藻  分类学  形态  核糖体大亚基
DOI:10.11926/jtsb.3891
分类号:
基金项目:国家自然科学基金项目(31570205,31370235)资助
Taxonomic Revision of Chaetoceros diversus and C. laevis
XU Xiao-jing, LI Yang
Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, Guangdong Provincial Key Laboratory of Healthy and safe Aquaculture, College of Life Science, South China Normal University, Guangzhou 510631, China
Abstract:
In order to clarify the taxonomic issues between Chaetoceros diversus Cleve and C. laevis Leuduger-Fortmorel, their monoclonal strains were established near Nanao Island region, Guangdong Province. The continuous morphology of them was observed during all life stages under light and electron microscopies. The results showed that the extending direction of the thick setae were various in different life stages, so that they are not constant and can't be considered as useful taxonomic features. The D1-D3 sequence of the large subunit encoding ribosomal gene was amplified and analyzed. The results showed that the strains of C. diversus and C. laevis have the coincident sequences except only two differential bases in one strain of C. laevis. Chaetoceros diversus and C. laevis have uniform phylogenetic position in molecular tree, which indicates that they belong to the same species. Therefore, C. laevis is proposed as the synonym of C. diversus.
Key words:  Chaetoceros diversus  Chaetoceros laevis  Taxonomy  Morphology  Large ribosomal subunit

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