Ultrastructure and Differentiation in Chara Sp. II. Mitosis
Ultrastructure and Differentiation in Chara Sp. II. Mitosis
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Chara Sp 的超微结构和分化。
DOI：
10.1071/bi9670883
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发表时间：
1967
期刊：
影响因子：
--
通讯作者：
J. Pickett
中科院分区：
文献类型：
--
作者：
J. Pickett
描述了Chara部分分裂细胞的超微结构。在营养细胞中没有检测到中心粒。不对称的细胞分裂，形成一种预定的细胞模式，显然没有任何细胞器的特征性分组。核仁在前前期分散，大部分核仁物质在整个分裂过程中与染色体密切相关，尽管有些物质在末期似乎被排除在细胞核之外。内质网极性区形成于早期前期，微管附着于子染色体稍早于非常精确排列的中期板的形成。染色体臂也很明显地排列在这个平板的平面上。
The ultrastructure of some dividing cells of Chara are described. No centrioles have ever been detected in vegetative cells. Asymmetric cell division, forming a predetermined pattern of cells, was apparently not preceded by any characteristic grouping of cell organelles. The nucleoli became dispersed during pre-prophase, and most of the nucleolar material appeared intimately associated with the chromosomes throughout division, although some seemed excluded from the nucleus at late telophase. Polar zones of endoplasmic reticulum were formed in early prophase, and attachment of microtubules to daughter chromosomes slightly preceded the formation of a very precisely aligned metaphase plate. The chromosome arms were also apparently all aligned in the plane of this plate.