On the constancy of cell division rate in the root meristem
On the constancy of cell division rate in the root meristem
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DOI：
10.1023/a:1006383921517
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发表时间：
2000-08-01
影响因子：
5.1
通讯作者：
Baskin, TI
中科院分区：
文献类型：
--
作者：
Baskin, TI
这篇评论探讨在什么情况下，细胞分裂的速率之间的细胞的根分生组织是已知的变化。首先，比较了用于量化细胞分裂速率的方法。这些可以被分组为细胞学的，其中细胞在细胞周期的特定阶段中的积累速率基于某种形式的细胞学标记来确定，或者运动学的，其中细胞积累速率由细胞的净运动来确定。然后，证据审查是否细胞分裂速率不同组织或细胞类型之间，在根的不同位置之间，或最终在不同的环境之间。这些证据与细胞以恒定速率分裂是一致的，并且细胞分裂速率发生实质性变化的有据可查的例子很少见。细胞分裂速率的恒定性与分裂细胞的数量形成对比，分裂细胞的数量变化很大，这意味着细胞周期控制的一个要点是控制在分生组织的基部边界处从增殖状态退出。
This review examines under what circumstances the rate of cell division among cells of the root meristem is known to vary. First, methods are compared that have been used to quantify cell division rate. These can be grouped as being either cytological, in which the rate of accumulation of cells in a particular phase of the cell cycle is determined based on some form of cytological labeling, or kinematic, in which the rate of cell accumulation is determined from the net movement of cells. Then, evidence is reviewed as to whether cell division rates vary between different tissues or cell types, between different positions in the root, or finally between different environments. The evidence is consistent with cells dividing at a constant rate, and well documented examples where cell division rate changes substantially are rare. The constancy of cell division rate contrasts with the number of dividing cells, which varies extensively, and implies that a major point for cell cycle control is governing the exit from the proliferative state at the basal boundary of the meristem.