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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >ULTRASTRUCTURAL CHARACTERIZATION OF ASEXUAL CYSTS OF GONYAULAX POLYEDRA STEIN (DINOFLAGELLATA)
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ULTRASTRUCTURAL CHARACTERIZATION OF ASEXUAL CYSTS OF GONYAULAX POLYEDRA STEIN (DINOFLAGELLATA)

机译：虎杖聚腺苷（DINOFLAGELLATA）无性囊肿的超微结构表征。

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摘要

In the bioluminescent dinoflagellate Gonyaulax polyedra, the formation of asexual cysts was elicited either by addition of 5-methoxytryptamine or by transfer to short-day conditions under lower temperature and decreased light intensity. The resulting changes were followed in vivo by light microscopy, and analysed ultrastructurally by electron microscopy. Irrespective of the method of cyst induction, theca and flagella shedding and the formation of a cyst wall can always be observed as essential steps in this process. Despite the extremely low level of bioluminescence emitted from the cysts, some scintillons persist. Encystment is accompanied by organelle and substructure rearrangement. Although cysts induced by 5-methoxytryptamine or by short days closely resemble each other, electron microscopy reveals typical differences. In cysts obtained by treatment with 5-methoxytryptamine most chloroplasts are of the expanded type, extending to the central region, whereas only a few are compact and peripherally positioned. Cysts induced by short-days predominantly contain chloroplasts of the compact type and contain large amounts of stored starch and lipids. Their ultrastructural organization therefore resembles that of mastigote cells during darkness. [References: 10]
机译：在生物发光的鞭毛藻（Gonyaulax polyedra）中，无性囊肿的形成是通过添加5-甲氧基色胺或在较低的温度和降低的光强度下转移至短日条件引起的。通过光学显微镜在体内追踪所产生的变化，并通过电子显微镜超微结构分析。无论采用何种囊肿诱导方法，总是可以观察到卵泡膜和鞭毛脱落以及囊壁的形成是该过程中的必要步骤。尽管从囊肿发出的生物发光水平极低，但一些闪烁体仍然存在。囊肿伴随着细胞器和亚结构的重排。尽管5-甲氧基色胺或短日诱导的囊肿彼此相似，但电子显微镜显示出典型的差异。在用5-甲氧基色胺治疗的囊肿中，大多数叶绿体是扩张型的，延伸到中心区域，而只有少数是紧凑的并且位于外围。短日诱导的囊肿主要含有致密型叶绿体，并含有大量储存的淀粉和脂质。因此，它们的超微结构类似于黑暗中的自噬细胞。 [参考：10]

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