Light and electron microscopical observations on the type species of Gymnodinium, G-fuscum (Dinophyceae)
Light and electron microscopical observations on the type species of Gymnodinium, G-fuscum (Dinophyceae)
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DOI：
10.2216/i0031-8884-39-5-365.1
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发表时间：
2000-09-01
期刊：
影响因子：
1.6
通讯作者：
Roberts, KR
中科院分区：
文献类型：
--
作者：
Hansen, G;Moestrup, O;Roberts, KR
Fuscum（Escherberg）Stein是裸盖菇属的模式种。最大的甲藻属之一。它具有甲藻的典型精细结构，但也具有一些不寻常的特征。核被膜特化为具有囊泡室，核孔位于囊泡室中;脓疱复合体包括内部收集室;核纤维结缔组织将核与鞭毛器的纵向微管根连接起来。通过扫描电子显微镜可以看到一个精致的马蹄形顶端沟。同样的形态特征在其他几种裸盖蕨中也有发现。表明一个密切的系统发育关系，最近已被用来，连同大亚基（LSU）rDNA数据，在重新定义属Gymatinium [Daugbjerg nl.（2000）Phycologia 39：302-317]。然而，G. fuscum是缺乏横向条纹状鞭毛根，这是目前已知的仅存在于其他非常不同的夜光藻属的游动孢子中的特征。这一特征，加上缺乏条纹衣领周围的鞭毛管，建议一个更孤立的位置，为G。褐色。未来的研究可能会揭示进一步“分裂”的Gymnastinium属的需要。
Gymnodinium fuscum (Ehrenberg) Stein is the type species of Gymnodinium. one of the largest genera of dinoflagellates. It has the typical fine structure of dinoflagellates, but also possesses several unusual features. The nuclear envelope is specialized by having vesicular chambers in which the nuclear pores are located: the pusular complex includes an internal collection chamber: and a nuclear fibrous connective links the nucleus with the longitudinal microtubular root of the flagellar apparatus. A delicate horseshoe-shaped apical groove is visible by scanning electron microscopy. The same morphological features have been observed in a few other gymnodinioids. indicating a close phylogenetic relationship, and have recently been used, together with large subunit (LSU) rDNA data, in redefining the genus Gymnodinium [Daugbjerg er nl. (2000) Phycologia 39: 302-317]. However, one of the most unusual features of G. fuscum is the absence of a transverse striated flagellar root, a feature presently known only in the zoospores of the otherwise very different genus Noctiluca. This feature, together with the lack of striated collars around the flagellar canals, suggests a phylogenetically more isolated position for G. fuscum. Future investigations may reveal the need for further 'splitting' of the genus Gymnodinium.