Nomura Mami, Ishida Ken-Ichiro
Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
Protist. 2016 Aug;167(4):303-318. doi: 10.1016/j.protis.2016.05.002. Epub 2016 Jun 7.
The fine structure of shell formation was observed in P. chromatophora. Scales were formed one by one in silica deposition vesicles (SDVs) that were supported by an array of microtubules, which are probably involved in determining the shape and size of scales. The timing of silicic acid transport into an SDV was shown to be at an early stage of scale production because silicon was detected within SDVs containing immature scales. During the shell construction process, vesicles containing two types of dense materials were observed. One type of vesicle contains lower-density material and is located at the front edge of the branched, thick pseudopodium, extending from the maternal shell to the newly formed shell. The other type of vesicle, which contains higher-density material, was also observed in the thick pseudopodium. It appears that microtubules are involved in the shell construction process.
在嗜色菌中观察到了壳形成的精细结构。鳞片在由一系列微管支撑的二氧化硅沉积小泡（SDV）中逐个形成，这些微管可能参与确定鳞片的形状和大小。硅酸转运到SDV的时间显示为鳞片产生的早期阶段，因为在含有未成熟鳞片的SDV中检测到了硅。在壳构建过程中，观察到含有两种致密物质的小泡。一种小泡含有低密度物质，位于从母壳延伸到新形成壳的分支粗伪足的前缘。在粗伪足中也观察到了另一种含有高密度物质的小泡。看来微管参与了壳的构建过程。
