摘要
Cells of the potentially toxic dinoflagellate Alexandrium catenella have a complement of features typical of dinoflagellates, including dinokaryon, pusule and amphiesma. No endosymbiotic bacteria were found in the Californian strain examined, which is weakly toxic. The chloroplast consists of a central pyrenoid complex with radiating chloroplast lobes, an arrangement found also in certain other gonyaulacoid dinoagellates. Cells are often arranged in few-celled chains and a cytoplasmic connection interconnects adjoining cells. Striated fibres line the attachment canal and also subtend the apical pore, making up an ‘apical fibrous complex’. The flagellar apparatus basically resembles that of other gonyaulacoids. However, Alexandrium catenella, Gonyaulax spinifera and Protoceratium reticulatum share the presence of two striated collar connectives and a single-stranded microtubular root associated with the longitudinal basal body, in addition to the multi-stranded root characteristic of dinoflagellates in general. Ultrastructural features indicate that these three species are closely related while Ceratium furcoides, another gonyaulacoid dinoflagellate, apparently lacks these features.
摘要译文
潜在毒性甲藻亚历山大藻链状细胞的细胞具有典型的双鞭毛虫特征的补充，包括dinokaryon，pusule和amphiesma。在所检查的加利福尼亚菌株中没有发现内生菌，这种菌具有弱毒性。叶绿体由具有辐射叶绿体叶的中央pyrenoid复合物组成，在某些其他gonyaulacoid dinoagellates中也发现了这种排列。细胞通常以少数细胞链排列，细胞质连接互相连接细胞。条纹纤维排列附着管道并且还对着顶端孔，构成“顶端纤维复合体”。鞭毛装置基本上类似于其他gonyaulacoids。然而，亚历山大藻（Alexandrium catenella），Gonyaulax spinifera和Protoceratium reticulatum共同存在两条条纹的结肠连接体和与纵向基体相关的单链微管根，以及一般的双鞭毛虫的多链根特征。超微结构特征表明这三种物种密切相关，而另一种gonyaulacoid dinoflagellate Ceratium furcoides显然缺乏这些特征。
Gert Hansen [1];Øjvind Moestrup [2]. Fine-structural characterization of Alexandrium catenella (Dinophyceae) with special emphasis on the flagellar apparatus[J]. British Phycological Bulletin, 1998,33(4): 281-291