Ontogenetic analysis of siliceous cell wall formation in Triparma laevis f. inornata (Parmales, Stramenopiles)
Ontogenetic analysis of siliceous cell wall formation in Triparma laevis f. inornata (Parmales, Stramenopiles)
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非洲火公牛硅质细胞壁形成的个体发生分析。
DOI：
10.1111/jpy.12800
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发表时间：
2018
影响因子：
2.9
通讯作者：
Yoshikawa Shinya
中科院分区：
文献类型：
--
作者：
Yamada Kazumasa;Katsura Hirotaka;No?l Mary-H?l?ne;Ichinomiya Mutsuo;Kuwata Akira;Sato Shinya;Yoshikawa Shinya
无装饰三疣蟹（Triparma laevisf. inornatae）是一种单细胞藻类，隶属于Bolidophyceae，与硅藻关系最为密切。和硅藻一样，T. laevisf. inornata也有硅质的细胞壁。无装饰毛白杨的细胞壁由四个圆板（三个盾板和一个腹板）、一个背板和三个带板组成。但是，与硅藻不同的是，当二氧化硅浓度耗尽时，T. laevisf.inornatacells可以生长。我们利用这一能力，利用透射电镜研究硅质板块的个体发育，图案中心的形成和发展。在板块形成的早期和中期，观察到两种类型的模式中心（环和胸骨）。在它们的形成过程中，环最初是新月形的，但最终它们的末端融合成环。只有向外硅沉积的分支肋发生在不断增长的环，直到它成为一个环，导致在一个未填充的环内。盾板的图形中心总是一个环，但在腹侧板既有环又有胸骨。无装饰板的瓣环和胸骨与硅藻瓣的瓣环和胸骨非常相似。这些结果表明，Parmales的圆板是同源的硅藻阀。这一关于T. laevisf. inornata的板块个体发育的信息为研究Parmales和硅藻中硅质细胞壁的演化提供了新的见解。
Triparma laevisf.inornatais a unicellular alga belonging to the Bolidophyceae, which is most closely related to diatoms. Like diatoms,T. laevisf.inornatahas a siliceous cell wall. The cell wall ofT. laevisf.inornataconsists of four round plates (three shields and one ventral plate) and one dorsal and three girdle plates. But, unlike diatoms,T. laevisf.inornatacells can grow when concentrations of silica are depleted. We took advantage of this ability, using TEM to study the ontogeny of the siliceous plate, pattern center formation, and development. Two types of pattern centers (annulus and sternum) were observed in the early and middle stage of plate formation. During their formation, the annuli were initially crescent‐shaped but eventually their ends fused to make a ring. Only outward silica deposition of the branching ribs occurred on the growing annulus until it became a ring, resulting in an unfilled circle inside the annulus. The pattern center of the shield plate was always an annulus, but in ventral plates both annulus and sternum were observed. The annuli and sterna inT. laevisf.inornataround plates were very similar to the annuli and sterna in diatom valves. These results suggested that the round plates of Parmales are homologous to diatom valves. This information on the plate ontogeny ofT. laevisf.inornataprovides new insights into the evolution of the siliceous cell wall in the Parmales and diatoms.
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影响因子：
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DOI：
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发表时间：
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期刊：
Journal of electron microscopy
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作者：
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作者：
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