Secondary walls in hyaline cells of Sphagnum
Secondary walls in hyaline cells of Sphagnum
复制标题
泥炭藓透明细胞的次生壁
DOI：
10.1071/bt03010
复制
发表时间：
2004
影响因子：
1.1
通讯作者：
A. Drinnan
中科院分区：
文献类型：
--
作者：
Celeste L. Kremer;A. Drinnan
本文研究了泥炭藓透明细胞中与细胞分化、次生壁和气孔形成有关的细胞骨架和超微结构。微管从未分化透明细胞中的随机排列重新定向为伸长细胞中的横向排列。一旦细胞完全伸长，宽的微管带聚集成螺旋，预测次生细胞壁沉积的位置。次生壁具有与初生壁相似的纤维状组成。在次生壁沉积之后，覆盖孔隙的薄初生壁通常通过孔隙中心和其边缘周围的细胞壁降解而破裂。最后，透明细胞经历胞质变性。微管的方向与透明细胞的形成和次生细胞壁的图案类似的超微结构的发展在高等植物的导管分子。在细胞分化和次生壁形成过程中细胞骨架阵列的相似性表明，一个基本的发展途径，共同的bratellites和高等植物。
The cytoskeleton and ultrastructural events associated with cell differentiation and secondary cell wall and pore formation in hyaline cells of Sphagnum are investigated. Microtubules reorient from random arrays in undifferentiated hyaline cells to transverse arrays in elongating cells. Once cells are fully elongated, broad bands of microtubules aggregate into a spiral that predicts the site of secondary cell wall deposition. The secondary wall has a similar fibrillar composition to the primary wall. After the secondary wall is deposited, the thin primary wall covering the pore breaks down, usually by cell-wall degradation at the centre of the pore and around its margin. Finally, the hyaline cell undergoes cytoplasmic degeneration. The orientation of microtubules associated with hyaline-cell formation and secondary cell wall patterning resembles ultrastructural development in tracheary elements of higher plants. The similarities in cytoskeletal arrays during cell differentiation and secondary-wall formation suggest a fundamental pathway of development shared by bryophytes and higher plants.