NEW OBSERVATIONS ON THE COCCOLITHOPHORID UMBILICOSPHAERA-SIBOGAE VAR-FOLIOSA (PRYMNESIOPHYCEAE) WITH REFERENCE TO CELL COVERING, CELL STRUCTURE AND FLAGELLAR APPARATUS
NEW OBSERVATIONS ON THE COCCOLITHOPHORID UMBILICOSPHAERA-SIBOGAE VAR-FOLIOSA (PRYMNESIOPHYCEAE) WITH REFERENCE TO CELL COVERING, CELL STRUCTURE AND FLAGELLAR APPARATUS
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DOI：
10.1080/00071618400650401
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发表时间：
1984-01-01
期刊：
影响因子：
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通讯作者：
PIENAAR, RN
中科院分区：
文献类型：
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作者：
INOUYE, I;PIENAAR, RN
对球石藻U.西博加（Weber-van博塞）Gaarder var. foliosa（Kamptner）Okada et McIntyre的光镜和电镜观察。在文化中，这个物种是单细胞和非鞭毛虫，通过简单的二分裂分裂。球球体由单一类型的圆形板石组成。每个颗石由4种不同类型的钙化元素组成，沉积在无模式的基板尺度上。不寻常的球孢子类似于模式变种U。西博加（Weber-van博塞）Gaarder var.在培养物中还观察到sibogae以及异常球结肠。未钙化的身体鳞片完全消失。有2 - 6个叶绿体，每个叶绿体含有一个浸入的蛋白核，其基质被薄的包膜包围。核膜与叶绿体内质网汇合。内质网也延伸到高尔基区，并包围高尔基池，其中产生单个球结肠。虽然鞭毛器持续存在，但从未观察到鞭毛细胞。它由2个由近端和远端带连接的基体，8个触丝体基部的微管和3个不对称排列的微管根组成。两个根是复合的，由2套微管组成，第三个根是简单的，由至少4个微管组成。对U.锡博加湾sibogae和U.锡博加湾foliosa以及分类的重要性的细胞覆盖进行了讨论。鞭毛装置进行了比较，侧金藻和它的重要性作为一个系统发育标记进行了讨论。
Unialgal cultures of the coccolithophorid U. sibogae (Weber-van Bosse) Gaarder var. foliosa (Kamptner) Okada et McIntyre were investigated using light and electron microscopy. In culture this species is unicellular and non-flagellate, dividing by simple binary fission. The coccosphere is composed of circular placoliths of a single type. Each coccolith consists of 4 different types of calcified elements deposited on a patternless base-plate scale. Unusual coccoliths similar to those of the type variety U. sibogae (Weber-van Bosse) Gaarder var. sibogae as well as abnormal coccoliths were also observed in culture. Uncalcified body scales are completely absent. There are 2-6 chloroplasts each containing an immersed pyrenoid, the matrix of which is surrounded by a thin envelope. The nuclear envelope is confluent with the chloroplast endoplasmic reticulum. The endoplasmic reticulum also extends towards the Golgi region and surrounds the Golgi cisternae in which single coccoliths are produced. Flagellate cells were never observed though the flagellar apparatus is persistently present. This consists of 2 basal bodies linked by proximal and distal bands, 8 microtubules of the haptonema base and three asymmetrically arranged microtubular roots. Two of the roots are compound, consisting of 2 sets of microtubules and the 3rd is simple consisting of at least 4 microtubules. The taxonomy of U. sibogae var. sibogae and U. sibogae var. foliosa as well as the taxonomic importance of the cell covering is discussed. The flagellar apparatus is compared with that of Pleurochrysis and its importance as a phylogenetic marker is discussed.