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张成武, 胡鸿钧. 广东四片藻鞭毛器的亚微结构和囊壳的形成[J]. 植物科学学报, 1993, 11(1): 5-12.
引用本文: 张成武, 胡鸿钧. 广东四片藻鞭毛器的亚微结构和囊壳的形成[J]. 植物科学学报, 1993, 11(1): 5-12.
Zhang Chengwu, Hu Hongjun. THE ULTRASTRUCTURE OF FLAGELLAR APPARATUS AND THE DEVELOPMENT OF THECA IN TETRASELMIS GUANGDONGENSIS (PRASINOPHYCEAE)[J]. Plant Science Journal, 1993, 11(1): 5-12.
Citation: Zhang Chengwu, Hu Hongjun. THE ULTRASTRUCTURE OF FLAGELLAR APPARATUS AND THE DEVELOPMENT OF THECA IN TETRASELMIS GUANGDONGENSIS (PRASINOPHYCEAE)[J]. Plant Science Journal, 1993, 11(1): 5-12.

广东四片藻鞭毛器的亚微结构和囊壳的形成

THE ULTRASTRUCTURE OF FLAGELLAR APPARATUS AND THE DEVELOPMENT OF THECA IN TETRASELMIS GUANGDONGENSIS (PRASINOPHYCEAE)

  • 摘要: 本文详细研究了1种海生4条鞭毛的单胞绿藻——广东四片藻鞭毛器的亚微结构和囊壳的形成。4条鞭毛着生于细胞前端凹陷的基部,鞭毛表面覆盖2层鳞片;基体呈纵向平行的“Z”字形排列;具纹纤维连接内外径向排列的两个基体;4个片层状的卵形盘(或称半桥粒(halfdesmosome))微管和纤维物质构成的复合体将鞭毛器和根丝体固着在质膜和囊壳上。根丝体通过两束交叉的微管带与两个邻近的外侧基体相连接。这种连接方式与其它已研究过的四片藻是不同的。囊壳的形成开始于内膜系统,特别是高尔基体。纤维丛和电子密集颗粒在其中合成、修饰,同时由高尔基体衍生的小泡转移到原生质体表面特定的区域,然后经若干步骤接合成完整的囊壳。这个区域与蛋白核的位置相关,表明聚合星状颗粒酶是在蛋白核位点制造或释放的,同时分泌到细胞外。囊壳沿边生长组装与细胞质发育产生特征性的前端鞭毛凹陷同时发生。

     

    Abstract: The ultrastructure of flagellar apparatus and the development of theca in the marine quadriflagellate green alga Tetraselmis guangdongensis have been studied in detail. The four flagella emerge from an apical trough in theca and arrange in a zigzag ( "Z" ) row with their long axes nearly parallel. They are covered by two layers of scales. The striated fiber (transfiber)connects each outer basal body with the inner basal body of the opposite, mirror image pair. A complex system of four laminated oval dics(halfdesmosme, rhizanchora), microtubule and fibrous material anchor the flagellar apparatus and rhizoplast to plasma membrane and theca. A rhizoplast with two bundles cross microtubulous band linking to two near outer basal bodies and two rhizanchora. This character is different from other Tetraselmis.The development of theea begins in the endomembrane system, particularly the Golgi apparatus where fibrillar tufts and electron-dense particles are synthesized, modified and transported to the outside by vesicles derived from the Golgi apparatus. Here, the tufts and droplets are displaced at a predetermined place on the surface of protoplast, then surround it and assemble in several steps to coalesce the intact theca. This place is related to the position of the pyrenoid. It is suggested that an enzyme capable of agglutinating stellate particles is probably elaborated or liberated at the site of pyrenoid and secreted thence to the cell exterior Edge-growth assembly of the theca occurs here synchronously with cytoplasmic developments yield the charateristic anterior flagellar pit.

     

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