| 摘要: |
| 于1981年3月在西沙群岛永兴岛采集原绿藻标本。用光镜和电镜对所采原绿藻进行研究。结果表明，原绿藻为简单的原核、单细胞藻类，在同一生境的相同宿主体表有4种不同的细胞构造类型：第1种类型，中央大“液泡”，类囊体单条、平行分散于周围区的细胞质中；第2种类型，中央是大“液泡”，周围区内类囊体多，并形成垛叠；第3种类型，许多小泡充满细胞的大部分，类囊体穿插于小泡之间；第4种类型，有中央大“液泡”，还有许多小泡分散在细胞周围区。上述分类以类囊体和“液泡”的结构和分布为主要分类依据，反映出不同结构的进化意义。表明中国西沙群岛有丰富的原绿藻资源。 |
| 关键词: 西沙群岛 原绿藻 超微结构 原核藻类 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，85062号 |
附件 |
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| STUDIES ON THE ULTRASTRUCTURE OF PROCHLORON SP. FROM THE XISHA ISLANDS |
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SUN Ai-shu,ZENG Cheng-kui (C.K.Tseng)
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Institute of Oceanology, The Chinese Academy of Sciences, Qingdao, 266071
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| Abstract: |
| Samples of Prochloron sp. were collected from the Yongxing Island of the Xisha Archipelago in 1981. The material was ?xed for 2h in 2.5% seawater glutaraldehyde in the field and washed three times in boiled seawater for at least 20 min each time, then postfixed in 1% osmium tetroxide for 1h, dehydrated in an ethanol series. The material was transported to the laboratory in 70% ethenol and further dehydrated, permeated and embedded in Epon 812. Sections were stained with lead citrate and many] acetate and observed with H-500 TEM and SEM. A monograph was published in 1981 by C. K. Tseng et al, but no details of the ultrastructure has been reported. This report provides some detailed studies on the ultrastructure and taxonomy of Prochloron sp. from the Xisha region. The results show that 4 types of different structure could be distinguished. Type 1 is characterized by a large “vacuole” fills the central region of the cell and some parallel thylakoids, single and forming no stack, were arranged around the large central “vacuole" (Pig.lc).F0r Type 2, a large “vacuole” fills the central region of the cell and many parallel thylakoids forming stack were arrange around the large central “vacuole” (Fig. ld). Type3 has many small "vacuoles" which fill the greater part of the cell and the thylakoids run through among these small "vacuoles" (Fig. le). For Type 4, a central large “vacuole” and many smaller “vacuoles” disperse in the peripheral region of the cell (Fig. 1f).
Status of the thylakoid stack of these cells in the present study varies, ranging from single and no stack to more and forming stack; possibly it has certain evolutional significance, but the characteristic of “vacuole” must be used with care. The present work shows that the ultrastructure of the algae combines some characteristics of both blue and green algae. These cells of different structures in the present study live in the same location and host; the cellular structure of the different types is stable in the cell cycle. These differences in the cellular structure may have some taxonomic value. |
| Key words: Xisha Islands, Prochloron sp., Ultrastructure, Prokatyotic algae. |
