ULTRASTRUCTURE AND DESCRIPTION OF CYANOPHORA BILOBA, SP. NOV., WITH ADDITIONAL OBSERVATIONS ON C. PARADOXA (GLAUCOPHYTA)
ULTRASTRUCTURE AND DESCRIPTION OF CYANOPHORA BILOBA, SP. NOV., WITH ADDITIONAL OBSERVATIONS ON C. PARADOXA (GLAUCOPHYTA)
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蓝藻 (Cyanophora BILOBA, SP) 的超微结构和描述。
DOI：
10.1046/j.1529-8817.1999.3540844.x
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
R. Lee
中科院分区：
文献类型：
--
作者：
P. Kugrens;B. Clay;C. Meyer;R. Lee
Cyanophora biloba, sp. 的细胞结构。十一月使用扫描电子显微镜、冷冻断裂和切片材料对 C. paradoxa Korschikoff 进行了检查。新物种的描述是基于细胞微形态、细胞覆盖以及蓝藻结构和数量的差异。 Cyanophora biloba 的特征是具有扁平的双叶细胞，每个叶都含有一个蓝藻。每个蓝藻总是有一个中央收缩，这可能代表着细胞分裂的停滞。裂片之间存在纵向凹槽或沟。鞭毛向腹侧和近顶端呈弧形插入，鞭毛插入附近的区域两侧有两个短褶皱。两根鞭毛都长有细小的纤维状毛。细胞核呈马蹄形，与细胞形状相符，位于细胞后部。银杏中的细胞覆盖物由位于质膜下方的重叠囊泡组成，每个囊泡都包含一个薄板。冷冻断裂表明这些板似乎具有亚基的晶体排列。出于比较目的，重新检查了 C. paradoxa 的表面结构和细胞覆盖，发现一些特征是新的或与之前描述的略有不同。 C. paradoxa 的细胞覆盖物也由与板重叠的囊泡组成，但这些囊泡比 C. biloba 中的小。此外，细胞有一个前沟，可以被鞭毛插入部位附近的两个长褶皱部分覆盖。
The cell structure of Cyanophora biloba, sp. nov. and C. paradoxa Korschikoff was examined using scanning electron microscopy, freeze‐fracture, and sectioned material. The new species description was based on differences in cell micromorphology, in the cell covering, and in cyanelle structure and number. Cyanophora biloba is characterized by having flat, bilobed cells, with each lobe containing a cyanelle. Each cyanelle invariably has a central constriction that probably represents an arrested cytokinesis. A longitudinal groove or furrow is present between the lobes. The flagella arc inserted ventrally and subapically, and the area near the flagellar insertio is flanked by two short folds. Both flagella bear fine fibrillar hairs. The nucleus is horseshoe‐shaped, conforming to the cell shape, and is located in the posterior of the cell. The cell covering in C. biloba consists of overlapping vesicles situated underneath the plasma membrane, and each vesicle contains a thin plate. Freeze fracture revealed that the plates appear to have a crystalline arrangement of subunits. For comparative purposes, the surface architecture and cell covering of C. paradoxa were re‐examined and some features were found to be new or slightly different than previously described. The cell covering of C. paradoxa also consisted of overlapping vesicles with plates, but the vesicles were smaller than those in C. biloba. In addition, the cell had an anterior furrow that can be partially covered by two long folds near the site of flagellar insertion.