Ultrastructural Studies on Gyrodinium sp. , a Marine Catenate Dinoflagellate

關於海洋連鎖狀渦鞭毛藻Gyrodinium sp.超微細構造之研究

陳建初(Jiann-Chu Chen) ； 石尾真彌(Shinya Ishio) ； 矢野友紀(Tomoki Yano)

《臺灣水產學會刊》 6卷2期 (1979/06) Pp. 1-12

https://doi.org/10.29822/JFST.197906.0001

摘要

Gyrodinium sp.是一種海洋連鎖狀渦鞭毛藻，以電子顯微鏡研究其超微細構造。卻Gyrodinium sp．有一個與真核生物一樣二層核膜及許多核孔的細胞核。細胞核內除了有核仁外也有許多染色體小塊。各染色體小塊是以二個或三個連接點相互連結以構成染色體。DNA纖維存在於染色體內也存在於核質內，染色絲的排列很規則但相當複雜。在切片的染色上，對於細胞核尤其是其內的染色體用醋酸鈾之效果比醋酸鉛者為佳。
葉綠體的lamella構造是由三層thylakoid所組成，DNA纖維存在於澱粉核內，核糖體存在於lamella構造之問。粒線體由二層膜組成，其內膜有tubular cristae，此為渦鞭毛藻類粒線體的特徵。DNA纖維與核糖體也都存在於粒線體內。這些情形顯示著葉綠體和粒線體都能自行分裂也能行蛋白質合成。另外在這細胞質內發現有－由四層膜組成且呈同心圓的粒線體，在這特殊粒線體旁，常觀察到有普遍粒線體存在，作者認為這同心圓粒線體可能是普通粒線體的起源。

並列摘要

This paper deals with the ultrastructure of Gyrodinium sp., a marine catenate dinoflagellate by using electron microscopy. This organism contains a large nucleus and other inclusions. The nucleus has nuclear pores and two layers of membrane like that of eucaryote. Numerous chromosomal bodies which have regular and complicated chromonemata coiled among them are always observed clearly. This fact suggests that the chromosomes of dinoflagellate are different from those of eucaryote which do not appear except during dividing stages.
Concerning the electron staining of the cell sections, urany1 acetate gives better contrast than lead acetate for nucleus, especially for chromosome but not for cytoplasm.
The catenate cells of Gyrodinium sp. are connected together by a narrow lamella joint. In the cytoplasm, rough endoplasmic reticulum is not distinct but free ribosomes are scattered.
The chloroplast possesses three thylakoids and ribosomes in the interlamella space. The pyrenoid is often observed in the chloroplast having DNA fibrils coiled in the center. DNA fibrils are also observed in the electron transparent area of mitochodrion. A stratified concentric mitochondrion having four layers of membrane which are twice the width of nuclear envelope is considered to be the origin of usual mitochondrion.